Hobart FabCOR 86R: The Complete Guide to This Metal-Cored Welding Wire

Hobart FabCOR 86R: The Metal-Cored Wire Heavy Fabricators Keep Coming Back To

You’ve got a two-inch-thick excavator bucket to rebuild, a pile of mill-scale steel, and a foreman watching the clock. Run solid wire and you’ll spend half the shift grinding spatter. Run flux-cored and you’ll spend it chipping slag between every pass. When the job is already behind schedule, neither feels like a win.

That’s exactly the gap Hobart FabCOR 86R was built to fill. It’s a gas-shielded metal-cored wire for mild steel, classified under AWS A5.18 E70C-6M H4, and it is the wire many heavy-fabrication shops quietly treat as a productivity weapon. FabCOR 86R delivers deposition rates in excess of 20 lbs/hr (9 kg/hr) with deposition efficiencies of 95% and greater, yet it leaves virtually no slag coverage. You stop deslagging between passes the way you would with flux-cored.

In short, you get flux-cored deposition with much of the cleanliness and simplicity of solid wire. That combination explains why the wire keeps turning up on excavator buckets, dozer blades, structural weldments, and repair work where downtime costs far more than filler metal.

There’s a second reason shops keep reordering it. The “H4” in the classification caps diffusible hydrogen at 4 mL per 100 grams of deposited weld metal, which lowers the risk of hydrogen-assisted cracking on thick, restrained joints. Combined with low spatter and a smooth, easy-to-control arc, that makes FabCOR 86R forgiving enough for out-of-position repair work yet fast enough for long, flat production passes.

What Metal-Cored Wire Actually Is

Metal-cored arc welding uses a tubular wire filled with metal powder instead of flux. A shielding gas protects the arc, the powder melts into the weld puddle, and there is essentially no slag system to chip. If you’ve ever wondered whether flux core is the same as MIG, the answer is no, and metal-cored occupies its own space, behaving much more like MIG than traditional flux-cored.

What This Guide Covers

This is a complete, practical guide to running FabCOR 86R well. We’ll break down the E70C-6M H4 classification piece by piece, then cover shielding gas, polarity, and machine setup. Then we move into welding settings and deposition rates by wire diameter, the productivity and quality benefits, and where the wire shines across industries. We’ll also look at common mistakes and troubleshooting, how it stacks up against solid wire and flux-cored, plus safety, fume control, and storage.

If you’re comparing filler metals for a heavy fab job, this guide will help you decide whether FabCOR 86R fits. If you already run it, you’ll find setup numbers, gas recommendations, and fixes for the problems that trip people up. For a broader comparison of filler options, our MIG welding wire selection guide is a good companion read.

If you’re tired of trading speed for cleanup, FabCOR 86R is worth understanding properly. New to wire feeding altogether? Our complete beginner’s guide to using a wire welder covers the basics first. Otherwise, read on for the full breakdown.

What Is FabCOR 86R? Metal-Cored Wire Explained

At first glance, FabCOR 86R looks like any other spool of MIG wire. Cut through one, though, and it isn’t solid steel at all. It’s a tube.

Metal-cored wire is built like a drinking straw. A thin steel sheath forms the outer wall, and the hollow center is packed with finely milled metallic powders: iron, alloying elements, deoxidizers, and arc stabilizers. There’s no flux in that core, and that one detail separates metal-cored wire from everything else on the shelf.

Set it beside solid wire — one continuous strand of homogeneous metal, as we break down in our guide to what MIG welding wire is made of — and the contrast is immediate. Set it beside flux-cored wire, which hides a mineral flux inside the same tubular shape, and the contrast matters even more. Because FabCOR 86R’s core is metallic rather than mineral, essentially the entire wire becomes weld metal. Nothing is there to burn off and form slag.

The sheath-to-powder ratio isn’t fixed, either. Manufacturers adjust how much of the tube is steel versus powder, which is how one basic design yields wires with different strengths, chemistries, and arc behavior. Think of it as an alloy mixed on the fly inside the arc.

The Process: MCAW Runs Hot and Clean

FabCOR 86R runs under gas-shielded metal-cored arc welding, or MCAW. Unlike a self-shielded flux-cored wire, it needs an external shielding gas — commonly 75–95% argon balanced with CO2, or 95% argon with 5% oxygen. It runs on DCEP (electrode positive), the same polarity that drives heat into the workpiece for deep penetration on thick steel. If the polarity side of that confuses you, our explainer on DCEN vs DCEP polarity clears it up.

The argon-rich gas and the metallic core together produce a true spray-transfer arc. Instead of short-circuiting and popping, the wire sprays a fine, steady stream of molten droplets across the gap. The arc feels smooth and hums rather than crackles.

Two things follow from that:

• Spatter is minimal, so cleanup time drops.
• Virtually no slag forms, so there’s nothing to chip between passes.

That’s the whole appeal. A flux-cored wire leaves a slag layer you have to knock off before the next pass; FabCOR 86R doesn’t. You weld, you inspect, and you keep moving.

The efficiency gain is straightforward. With no slag to remove and little spatter to grind, more of your arc-on time goes into laying metal instead of cleaning up after it. On long multipass jobs, that difference compounds fast.

What the “R” Means and Why It Handles Dirty Steel

Hobart positions FabCOR 86R as a heavy-equipment grade wire, and the “R” is tied to that rugged, industrial role. It’s aimed at work where the steel hasn’t been cleaned to a lab finish.

The core carries higher levels of deoxidization elements. According to Hobart Brothers, those deoxidizers give FabCOR 86R more tolerance for welding over mill scale — the dark oxide layer on hot-rolled steel and plate. Instead of scale triggering porosity or lack of fusion, the deoxidizers tie up oxygen and let you run right over it. That matters on excavator buckets, dozer blades, and structural steel that has weathered a few seasons outdoors, and it’s exactly why a heavy-equipment grade filler earns its keep.

If you’re still getting comfortable with wire-feed equipment, our beginner’s guide to using a wire welder covers the fundamentals, and MCAW builds directly on them.

So FabCOR 86R is a tubular wire with a metallic heart: a steel sheath wrapped around a powder blend that turns almost entirely into weld metal. No slag, a smooth spray arc, and extra deoxidizers for real-world steel. That combination is exactly why it earns a permanent spot on heavy-fabrication racks.

FabCOR 86R Specifications: Breaking Down E70C-6M H4

Every wire’s datasheet leads with a string of letters and numbers that looks like a secret code. For FabCOR 86R, that code is E70C-6M H4, and once you know how to read it, you know almost everything important about the wire before you ever strike an arc. Let’s crack it open piece by piece.

Decoding the AWS Classification

So “E70C-6M H4” tells a fabricator that they’re holding a metal-cored electrode rated for 70 ksi (490 MPa) minimum tensile, with 20 ft-lbs of impact energy at -20°F (-29°C), designed for a mixed shielding gas, and carrying a low-hydrogen guarantee of under 4 ml/100g diffusible hydrogen. That last figure matters enormously on thick sections and restrained joints, where hydrogen is a leading cause of cracking. You can read more on matching hydrogen control to joint design in our guide to weld defects and repair.

Typical Weld Metal Chemistry

The deposit chemistry is a mild-steel blend, balanced for strength, ductility, and clean running. Typical values are:

• Carbon (C): ~0.04–0.06%
• Manganese (Mn): ~1.20–1.50%
• Silicon (Si): ~0.40–0.70%
• Sulfur (S): ~0.010% max
• Phosphorus (P): ~0.015% max

The controlled manganese and low sulfur/phosphorus keep the deposit tough and reduce hot-cracking risk, while the modest carbon level preserves ductility. That balance is why the wire tolerates heavier plate and higher heat inputs without turning brittle.

Typical Mechanical Properties

Because “M” implies a mix, actual numbers shift a little with the shielding gas ratio. Real-world datasheet ranges look like this:

Note how comfortably the tensile numbers clear the 70 psi minimum. That margin is deliberate; it gives engineers room to spec the wire against real working loads rather than bare-minimum values. If you’re comparing filler metal families, what MIG wire is made of helps frame how chemistry drives performance.

You can verify exact numbers on the manufacturer’s own page: Hobart Brothers product listing and the official FabCOR 86R datasheet.

The EN ISO 17632-A Classification

Outside North America, the same wire appears under the ISO banner as T46 2 M M21 3 H5. In plain terms: T46 signals a 460 MPa minimum tensile (roughly equivalent to the 70 ksi AWS figure, with ISO rounding), the 2 designates impact toughness at -20°C (-4°F), M confirms metal-cored construction, M21 specifies the mixed-gas shielding group, the 3 covers the position/alloy designation, and H5 certifies a hydrogen level under 5 ml/100g. Both classifications describe the same spool from different rulebooks.

Conformances, Approvals and Standard Diameters

FabCOR 86R carries a broad approvals package that makes it acceptable across structural, marine, and pressure work:

• ASME SFA 5.18 — filler metal spec referenced by ASME codes
• ABS, DNV-GL, Lloyd’s Register, Bureau Veritas — marine classification societies
• CWB — Canadian Welding Bureau
• CE — European conformity marking
• AWS D1.8 — seismic supplement, available for some diameter and gas mix combinations

That D1.8 seismic qualification is a standout for anyone doing structural steel in high-risk zones. The D1.8 approval documentation spells out exactly which sizes qualify.

The wire ships in six standard diameters, covering everything from thin-gauge fitting work to heavy multi-pass buildup:

• 0.035 in (0.9 mm)
• 0.045 in (1.2 mm)
• 0.052 in (1.4 mm)
• 1/16 in (1.6 mm)
• 5/64 in (2.0 mm)
• 3/32 in (2.4 mm)

Match the diameter to your deposition target and machine capacity, then dial in gas, polarity, and amperage to suit. For a broader view of how wire selection slots into shop setup, see our welding facility planning guide.

Shielding Gas, Polarity and Machine Setup for FabCOR 86R

Metal-cored wire is fussier about its supporting cast than solid wire, and FabCOR 86R is no exception. Get the gas, polarity, and feeder setup right and it runs like a dream; get them wrong and you’ll spend the day fighting spatter, porosity, and burnback. The good news is that once these variables are dialed in, the wire is remarkably consistent from spool to spool.

Shielding Gas Options

Hobart approves two families of shielding gas for FabCOR 86R: 75 to 95% argon with the balance CO2, or a 95% argon / 5% oxygen blend. A common mistake is grabbing straight CO2 because it’s cheap. That’s a flux-cored habit, and it robs this wire of the smooth spray transfer it’s built around.

Flow rate should land between 35 and 50 cfh (17–24 l/min). Too low invites porosity from atmospheric contamination; too high creates turbulence that pulls air into the shielding envelope. Set your regulator and verify the flow at the nozzle, not just at the cylinder, because leaks and restrictions in the hose can throw the reading off.

The mix you choose quietly shifts the whole arc:

As a rule, higher argon favors a smoother spray arc and reduced spatter, while higher CO2 increases penetration and slightly lowers toughness. If your procedure calls for impact toughness, lean toward the argon-rich end. If you’re chasing penetration on thick plate, a 75/25 blend gets you there faster.

Polarity: DCEP Only

FabCOR 86R must run on DCEP — direct current electrode positive. Don’t confuse this with the DCEN setup many self-shielded flux-cored wires require. With electrode positive, the wire is the positive terminal and the work is negative, pushing most of the heat into the wire tip. That’s what drives the stable spray transfer, good penetration, and low spatter this filler is known for. Hook it up the wrong way and you’ll see it immediately: a sputtering, unstable arc that’s almost impossible to tune. If the concept is new to you, our breakdown of DCEN vs DCEP polarity for flux core welding explains why the two behave so differently.

Feeder, Drive Rolls and Liner Setup

Because cored wire is hollow, it’s more delicate than solid wire. Use knurled or V-groove drive rolls sized to your wire diameter, and set tension just tight enough to feed without crushing or deforming the tube. Over-tensioning is the number-one cause of flaking, poor feed, and erratic arcs with metal-cored wire.

Fit a liner sized for cored wire, keep it short and straight, and blow it clean during spool changes. For contact tips, a slightly oversized bore helps, since the wire runs hot and expands. Your contact-tip-to-work distance (stickout) should sit around 1/2 to 3/4 inch (12–19 mm). Push it much longer and current drops, penetration falls off, and porosity creeps in. If you’re new to the machine itself, our complete beginner’s guide to using a wire welder walks through the whole setup from spool to first bead.

Storage and Cleanliness

Unlike some electrodes, re-drying is not recommended for FabCOR 86R. Hobart specifies storing it in a dry, enclosed environment in its original intact packaging. Once the seal is broken, keep spools covered and away from moisture, dust, and shop grit. A cored wire that picks up rust or surface contamination welds dirty, so treat a fresh spool like a precision component, not scrap. Rotate your stock so older spools get used first, and never leave an open spool sitting on the feeder overnight in a humid shop.

Short Note: Moisture and grime inside the wire’s hollow core translate directly into porosity and erratic arc behavior. Dry, clean storage isn’t fussiness — it’s the cheapest quality control you’ll ever run.

FabCOR 86R Welding Settings and Deposition Rates by Diameter

Before you touch a dial, understand the position rule. FabCOR 86R is engineered for flat and horizontal work only. It is not an all-position wire, so vertical-up and overhead are off the menu. When a joint turns vertical or overhead, switch to an all-position flux-cored filler instead. But for bench work, positioners, and flat plate, this wire lays down metal faster than almost anything in its class. That raw deposition speed is why fabricators reach for it on heavy plate, long seams, and jobs where labor time drives the bid. Set it up correctly and it becomes a genuine production tool.

Representative Parameter Windows by Diameter

The table below offers starting windows for the six common diameters. Treat them as launch points, then fine-tune to your machine, gas mix, and joint. Always confirm against the official FabCOR 86R data sheet.

Two anchor points show the range. On 0.045 in wire you can run as low as 200 A at 240 ipm for about 6.0 lbs/hr, then push all the way to 400 A at 725 ipm for roughly 19.8 lbs/hr. On 1/16 in wire the ceiling climbs to about 24.5 lbs/hr at 500 A, 32 V, and 500 ipm. That gap between the low and high ends is where your productivity lives. Learn to run near the top of the window and a single pass can replace two or three slower ones.

Tuning WFS and Voltage Together

Think of wire-feed speed as your amperage control and voltage as arc length. Set WFS first to hit your target current and penetration. Then trim voltage until the arc sounds like steady bacon frying and the bead has a smooth, slightly convex crown. Too little voltage gives a stubby arc, spatter, and ropey beads; too much makes a wide, washed-out bead that risks overlap. Get this balance right and spatter cleanup time drops, which matters as much as raw speed. For a benchmark on current control, compare how stick electrode amperage settings are dialed in and you will recognize the same logic.

Stickout: The Hidden Variable

Contact-tip-to-work distance changes your results as much as any dial. Short stickout raises current, deepens penetration, and speeds deposition but invites burnback. Long stickout drops current, reduces penetration, and warms the tip. The recommended window runs from about 1/2 in on 0.035 in wire up to 1-1/4 in on 3/32 in wire. Hold it consistent, because wandering stickout makes an inconsistent bead even when every other setting is perfect. A clean liner and correct polarity keep the feed stable while you focus on travel.

Reading the Arc

The sound and bead shape tell you everything. A crackling hiss means voltage is close. A harsh, sputtering buzz says add volts. Beads that sit high and narrow want more voltage; beads that look flat and washed want more wire. Once the setting sings, note it on the machine for the next identical job, and photograph the bead so anyone on the next shift can match it. Pair a disciplined setting with proper protective eyewear and a tidy bead check habit, and FabCOR 86R will reward you with clean, fast, high-deposition welds every shift.

The Benefits: Productivity, Efficiency and Weld Quality

Metal-cored wire earns its keep on the shop floor because it attacks the two biggest time thieves in heavy fabrication: cleanup and rework. Hobart FabCOR 86R takes that idea and pushes it further with a combination of high deposition, near-zero slag, and low-hydrogen chemistry. Here’s what that actually means when the clock is running.

Deposition Efficiency Above 95%

Deposition efficiency is the share of wire you buy that ends up as weld metal instead of slag, spatter, or fumes. FabCOR 86R runs at 95% and greater. Compare that to a typical flux-cored wire, where a meaningful slice of every pound goes into a slag blanket you then have to chip off and throw away. With metal-cored wire, almost the entire spool becomes usable weld. Over a long shift, that gap translates into fewer spools consumed per ton of finished work and a lower cost per foot of weld. For a shop laying hundreds of feet a day, that difference isn’t a rounding error; it’s margin.

That efficiency stacks on top of a high deposition rate. Because the arc is spread across the wire’s metal sheath, current density stays high without the burn-through you’d fight on solid wire at the same amperage. The result is more pounds per hour laid down, which is exactly why robotic and automated cells lean on it. If you’re comparing setups for a heavy automated line, our guide to robotic submerged arc welding covers how high-deposition processes fit together.

Virtually No Slag, Low Spatter and Smoke

Hobart lists the benefits plainly: virtually no slag coverage, low smoke and spatter, outstanding high-production performance, and excellent robotic weldability. Practically, that means:

• No chipping hammer between passes, so fewer stops and more arc-on time.
• Minimal spatter to grind, protecting your finish and your schedule.
• Less smoke, which matters for operator comfort and ventilation load.
• Cleaner beads that are easier to inspect and less likely to hide defects.

Fewer interruptions also cut the odds of the little problems that snowball, like cold lap or an overlap welding defect at a toe. When you’re not fighting slag and spatter, it’s easier to keep a consistent travel speed and drag angle, and your welds stay in the “good” column. You can see what that looks like in our breakdown of good and bad MIG welds.

Low Hydrogen (H4) for Crack Resistance

The “H4” in E70C-6M H4 is a promise about hydrogen. It means the wire deposits less than 4 ml of diffusible hydrogen per 100 grams of weld metal. That number matters most on thick sections, restrained joints, and higher-strength steels, where hydrogen can diffuse into the heat-affected zone and trigger hydrogen-induced cracking days after the weld cools. A low-hydrogen consumable shrinks that risk substantially, which is why FabCOR 86R is trusted on structural and repair work where a delayed crack is a disaster.

Operator Appeal and Process Flexibility

Welders notice the smooth, stable arc right away. It’s forgiving, runs with a spray-like transfer, and produces that quiet, wet-in bead that’s satisfying and fast to lay. FabCOR 86R suits both constant-voltage (CV) and pulsed welding, so the same spool works across a manual station and a pulsing power source or robot.

A few honest limits: it is not an all-position wire. Flat and horizontal work is where it lives, so out-of-position joints call for a different filler. It also requires shielding gas, so you can’t run it in windy field conditions without a baffle or shelter. In the right bay, though, the economics are hard to beat. Add up a shift: a station that once chipped slag three times per joint now runs straight through, and those saved man-hours land right on the job costing sheet.

Where FabCOR 86R Shines: Applications and Industries

FabCOR 86R isn’t the wire you reach for on thin sheet or finish-critical stainless. It’s built for the parts of the shop where the plate is thick, the weld is long, and the foreman is counting arc-on time. Hobart lists its sweet spots clearly: automated and robotic welding, steel structures, storage vessels, earthmoving equipment, and rail cars. It’s rated for single-pass and multi-pass welding of non-alloyed and fine-grain steels, according to the product datasheet. The wire’s job is to keep the arc lit and the spatter down, and every one of those categories rewards exactly that.

Automated and Robotic Welding

Metal-cored wire and mechanized welding were made for each other. Because the arc runs smooth and stable and the wire feeds with little resistance, FabCOR 86R holds its settings across a long seam without the operator chasing the puddle. That consistency is exactly what a robotic cell or a tractor-mounted carriage needs. When a torch travels at a fixed speed, the filler has to behave predictably pass after pass; a wire that wanders or spatters throws the whole program off. FabCOR 86R’s smooth arc and consistent feed make it well suited to robotic and mechanized welding cells, from gantry systems to positioners running thick plate. For a look at how far that automation logic stretches, see our guide to robotic submerged arc welding.

Heavy Equipment and Earthmoving

Earthmoving equipment is where the wire earns its keep. Excavator buckets, loader arms, dozer blades — these are thick mild steel parts that get beat up and rebuilt, usually with worn edges and dirty surfaces. The higher deoxidization in FabCOR 86R makes it noticeably more tolerant of mill scale, rust, and the surface contamination common on hot-rolled structural and heavy equipment steel that never got cleaned to bright metal. Field repairs and rebuilds rarely happen on a pristine bench, so that forgiveness saves grinding, cleanup, and rework.

Steel Structures and Storage Vessels

On structural steel the story is straightforward mileage. Long, straight fillet and groove welds on beams, columns, and plate assemblies mean the operator wants to keep the trigger down and the arc clean. Because FabCOR 86R leaves almost no slag to chip, multi-pass work on storage vessels and tanks moves faster — you can go pass to pass without stopping to grind. That’s a genuine difference on vessels with plenty of circumferential and longitudinal seams, where every minute of arc-off time adds up. Shops already leaning hard into mechanized, repeatable output often pair this wire with the workflows covered in our guide to welding in precision manufacturing.

Railcars and General Steel Fabrication

Railcar work combines thick plate, structural joints, and regulated fabrication. Metal-cored wire suits the long, repetitive welds on car bodies, frames, and underframes, and the low spatter means less cleanup in areas that are awkward to reach. Repetition is the point here: same joint, same settings, same result. Beyond rail, Hobart positions FabCOR 86R for general non-alloyed and fine-grain steel fabrication, both single-pass and multi-pass. For a shop doing mixed work — a bracket run one day, a repair on a thick mild steel housing the next — that spread is what keeps the spool loaded.

The common thread across all these applications is high arc-on time. The wire was designed to keep a torch moving, whether that’s a human hand on a structural beam or a robot arm on a railcar frame. Less spatter, no slag, and a stable arc all push in the same direction: more welding per shift. If you’re setting up a cell to take advantage of that, it’s worth getting the infrastructure right first — our guide to planning and setting up a safe shop covers layout, ventilation, and power basics.

Common Mistakes and Troubleshooting FabCOR 86R

FabCOR 86R is a forgiving wire when everything is dialed in, but it punishes shortcuts. Most of the problems welders blame on the wire actually trace back to polarity, gas, stickout, or feeding. Here’s how to spot each symptom and fix it fast.

Polarity and Shielding Gas Errors

The single most common setup mistake is running FabCOR 86R on DCEN. Metal-cored wire is designed for DCEP (electrode positive). Flip the polarity and the arc goes unstable, penetration drops, and you get a wash of spatter with cold, shallow fusion. If you’re used to self-shielded flux-cored wire that runs DCEN, this is the habit that trips you up. Our guide to polarity for flux core welding: DCEN vs DCEP explains the difference clearly.

Gas choice matters just as much. FabCOR 86R needs a mix containing argon, typically 75–92% argon balanced with CO2. Running straight 100% CO2 burns back arc stability and increases spatter, defeating the wire’s smooth-transfer advantage.

Stickout: Too Long or Too Short

Stickout is the most misunderstood variable. Push it too long and you lose penetration and risk lack of fusion; choke it too short and you get spatter buildup and rapid contact-tip wear.

Porosity and Spatter

Porosity usually points to contamination, not the wire. Check for dirty base metal (mill scale, oil, rust), a leaking gas hose, or a partially clogged nozzle disrupting gas flow. On the flip side, spatter that suddenly appears mid-job frequently means voltage is set too low: the wire stubs into the puddle instead of spraying. Bump voltage up in small steps.

Damp shop air and condensation inside gas lines can also introduce hydrogen and porosity. Drain your compressor and moisture traps regularly, and store spools sealed so they don’t absorb moisture in humid conditions.

Gas flow rate deserves a spot on the checklist too. Too little flow lets air into the puddle and causes porosity; too much creates turbulence that does the same thing. Most FabCOR 86R jobs run comfortably around 35–45 CFH, adjusted for drafts and nozzle size. Also verify your contact tip matches the wire diameter and isn’t ovaled from wear.

On thin sections, the opposite problem strikes: burn-through from too much current. Drop wire feed speed and voltage together, and increase travel speed rather than starving the arc.

Wire Feeding: Birdnesting, Liners and Whips

Metal-cored wire is tubular, so it crushes easily. Using standard V-groove drive rolls for solid wire deforms the wire, causing erratic feed and birdnesting at the drive rolls. Switch to knurled or U-groove rolls sized for the wire, set tension just tight enough to feed without crushing, and keep the liner the correct size and clean. A worn or kinked whip liner is a classic hidden cause of feed hesitation.

Don’t overlook the spool brake. Too much drag causes the drive rolls to slip and shave the wire; too little lets the spool overrun and tangle. Set it so the wire stops cleanly when you release the trigger.

Worm-Tracking and Out-of-Position Work

Worm-tracking, where the bead wanders off the joint line, comes from excessive stickout, high travel speed, or the torch angled too far from perpendicular. Tighten stickout, slow down slightly, and keep drag angle consistent. And remember: FabCOR 86R is engineered for flat and horizontal positions. Trying to weld vertical-up or overhead with it invites puddle control problems, so use a wire designed for those positions instead.

Visible defects like overlap or cold lap are worth catching early. If your bead edges look suspect, review our overlap welding defect guide and compare your results against good and bad MIG welds. Clean, consistent feeding and correct polarity solve most of what ails FabCOR 86R. Master those and the wire does the rest.

FabCOR 86R vs Solid Wire, Flux-Cored and Other Metal-Cored Wires

Choosing a filler metal is really a question of priority: speed, cleanup, position, or price. FabCOR 86R wins on some of those and loses on others, so a straight comparison helps you pick deliberately rather than by habit. The goal isn’t to crown a single “best” wire, but to match the wire to the joint, the position, and the amount of cleanup your shop can stomach.

FabCOR 86R vs Solid MIG Wire

Solid MIG wire is the default in most shops, and it’s the cheapest per pound. But at high current it struggles. Metal-cored wire generally offers higher deposition and efficiency than solid wire at comparable current because of higher current density in the sheath, so more of your amperage goes into melting wire instead of being lost to resistance heating. FabCOR 86R also wets out faster and produces less spatter at high amperage, which means less grinding and cleanup. The trade-off is deposition position: FabCOR 86R is a flat and horizontal wire, while solid wire can be run out-of-position. If you need vertical-up or overhead work, solid stays the pick. For long, flat beads on thick plate, the metal-cored wire usually pays for its higher price in labor savings alone. If you’re still sorting out which wire does what, our MIG wire selection guide breaks down the categories.

FabCOR 86R vs Flux-Cored Wire

This is the comparison that matters most for heavy fabrication. Flux-cored wire is versatile and often all-position, but it leaves a slag coating you have to chip and brush between passes. FabCOR 86R leaves no slag, eliminating deslagging time entirely and letting you stack passes back to back. It also runs cleaner, with lower fume than many flux-cored options. The catch: FabCOR 86R requires an external shielding gas and is limited to flat and horizontal positions, whereas flux-cored wire can go vertical and overhead and doesn’t need a gas cylinder in windy outdoor conditions. That positional freedom is the real selection trade-off, and it’s usually the deciding factor on structural jobs. If you’re weighing the two families, our breakdown of whether flux core is the same as MIG clears up the confusion.

FabCOR 86R vs Other Metal-Cored Wires

All metal-cored wires share the slag-free, high-deposition advantages, so the differences come down to chemistry and cleanliness. FabCOR 86R carries higher deoxidization elements than standard metal-cored wires, which lets it tolerate more mill scale and light rust without porosity. That’s a big deal when you’re welding hot-rolled steel straight off the rack instead of grinding it clean. General-purpose metal-cored wires and leaner grades often demand cleaner plate or produce more defects on dirty material. Higher-strength variants suit different base metals, but for mill-scale tolerance on carbon steel, 86R is the forgiving choice.

Quick Comparison at a Glance

When Each One Is the Right Choice

• Pick solid wire for thin material, all-position work, and lowest filler cost.
• Pick flux-cored for field work, outdoor wind, and out-of-position joints where gas shielding is impractical.
• Pick a generic metal-cored wire when you want slag-free speed on clean, well-prepped steel.
• Pick FabCOR 86R for high-volume, flat and horizontal welds on thick or lightly oxidized steel where you want maximum deposition with minimal cleanup.

None of these is universally “best.” FabCOR 86R trades positional flexibility for raw speed and a forgiving arc on dirty plate, and for a lot of heavy-fabrication benches that trade is exactly right. Read the table, check your positions, and let the job choose the wire.

Safety, Fume Control, Storage and Final Tips for FabCOR 86R

Metal-cored wire runs hot, deposits fast, and produces a different fume profile than solid wire. That productivity comes with real exposure considerations, so treat safety, fume control, and storage as part of the process rather than an afterthought.

Understanding the Fume

FabCOR 86R’s fume is mostly iron oxide, but it also carries manganese from the wire’s alloying. Manganese is the one to watch. ACGIH recommends a respirable manganese TLV of 0.02 mg/m³ and an inhalable TLV of 0.1 mg/m³, while OSHA’s PEL for manganese fume is 5 mg/m³ as a ceiling. Treat those limits as ceilings, never as targets, and monitor air quality where required.

NIOSH recommends controlling total welding fume to the lowest feasible concentration and notes that local exhaust ventilation can effectively reduce manganese exposure. In confined spaces, exposure climbs fast because fume has nowhere to go. Use LEV, a fume gun or extraction arm, right at the arc, and add a respirator for confined or poorly ventilated work. Check your shop’s airflow against guidance for welding facilities.

Confined Spaces and Respiratory Protection

When you weld inside a tank, bucket, or vessel, manganese fume concentrates quickly. NIOSH notes that confined-space welding can significantly raise exposure, making ventilation and respirators critical rather than optional. Set up forced-air and extraction first, then choose a respirator based on your exposure assessment: a half-mask with P100 filters for many jobs, powered air-purifying for longer or hotter work. Never rely on a dust mask alone.

Short Note: Keep a written exposure plan on file and fit-test respirators annually. A respirator that doesn’t seal protects no one.

PPE: Eyes, Face, and Skin

Metal-cored welding throws more radiant energy than it appears to. Wear a properly shaded auto-darkening helmet, safety glasses underneath for grinding and chipping, and a leather jacket, sleeves, gloves, and spats to stop spatter burns. Our protective eyewear guide covers lens shades and fit. Button collars, tape pockets shut, and never weld in synthetic cloth. Arc flash burns bare skin even when the arc feels far away, so keep sleeves down and collars closed.

Because the arc runs hot and the puddle is fluid, radiant heat and spatter are higher than many operators expect from a wire feed process. Screen off bystanders, keep flammables well clear, and let each pass cool enough to inspect. Check the surroundings with a fire watch; FabCOR 86R can throw sparks far enough to smolder.

Storage and Handling

Store FabCOR 86R dry, in its original intact packaging, and keep it sealed until use. Unlike some flux-cored products, metal-cored wire should not be re-dried. If the packaging is torn or the wire has been exposed to moisture, it feeds erratically and can introduce porosity. Keep spools off concrete, away from open shop doors, and inspect for rust before loading. Return partial spools to their wrapper at the end of the shift.

Best-Practice Checklist

Run through this list before every job:

• Verify classification: confirm E70C-6M H4 on the label and spool.
• Match gas and polarity: use the recommended shielding mix per the datasheet.
• Dial starting parameters: begin with manufacturer settings for your diameter, then fine-tune.
• Control stickout: hold it consistent, around 3/4 inch, to keep the arc stable.
• Keep travel consistent: steady speed prevents cold laps and overlap.
• Inspect welds: check for porosity, undercut, and incomplete fusion as you go.
• Maintain equipment: clean liners, check drive rolls, and replace worn contact tips.

The Wrap-Up

Hobart FabCOR 86R earns its reputation by delivering solid-wire deposition without flux-cored slag to chip away. Get the safety basics right — fume control, PPE, and dry storage — and it rewards you with clean, fast, repeatable welds on mill-scale steel that other wires struggle with. Keep this checklist handy, respect the exposure limits, and the wire will stay a productivity weapon for years.

If you are pregnant or planning to be, review welding while pregnant before scheduling heavy fume days, and keep a written exposure plan on file.

Frequently Asked Questions

What does E70C-6M H4 mean on FabCOR 86R?

It is the AWS A5.18 classification. E is electrode, 70 means 70 ksi minimum tensile strength, C means composite metal-cored, 6 means 20 ft-lbs impact toughness at -20F (-29C), M means mixed-gas (argon/CO2) shielding, and H4 means less than 4 ml/100g diffusible hydrogen.

Is FabCOR 86R a flux-cored wire or a MIG wire?

It is a metal-cored wire, a third category. It runs on MIG-type equipment with shielding gas and DCEP like solid MIG wire, but its tubular core is filled with metallic powder instead of flux, so it leaves almost no slag.

Can FabCOR 86R be used in all positions?

No. Hobart rates FabCOR 86R for flat and horizontal welding only, in part because its fast-freezing, high-fluid puddle makes it unsuitable for vertical-up and overhead work.

What shielding gas should I use with FabCOR 86R?

Use 75-95% argon with the balance CO2, or 95% argon/5% oxygen, at roughly 35-50 cfh. Higher argon generally gives a smoother arc and less spatter, while higher CO2 increases penetration.

What polarity does FabCOR 86R require?

It requires DCEP (electrode positive) direct current. Running it on DCEN will destabilize the arc and cause poor penetration and fusion.

How fast does FabCOR 86R deposit weld metal?

Deposition rates exceed 20 lbs/hr (9 kg/hr) with efficiencies of 95% or greater. For example, 1/16 in wire can deposit about 24.5 lbs/hr at 500 A, while 0.045 in wire reaches about 19.8 lbs/hr at 400 A.

Does FabCOR 86R work for robotic welding?

Yes. Its smooth, consistent arc, reliable feed and minimal spatter and slag make it an excellent choice for robotic and automated welding of mild steel in flat and horizontal positions.

Do I need to re-dry FabCOR 86R wire?

No. Hobart does not recommend re-drying this wire. Store it dry in an enclosed environment in its original intact packaging, and keep it clean before use.

What base metals can I weld with FabCOR 86R?

It is designed for mild steel and non-alloyed and fine-grain steels in single and multi-pass applications. The added deoxidizers help it tolerate mill scale better than many metal-cored wires.

Authoritative Sources & Further Reading

• https://www.hobartbrothers.com/product/product-details/fabcor-86r/
• https://www.hobartbrothers.com/wp-content/uploads/hobart-catalog/datasheets/Fabcor86R.pdf
• https://pdiimages.praxair.com/PDIB2CImages/product-pdf/Fabcor86R_Data_Sheet.pdf
• https://app.aws.org/mwf/attachments/97/104097/Fabcor86R.pdf
• https://sea.itwwelding.com/Upload/Resources/96/FabCOR%2086R%20-%20AWS%20D1.8.pdf
• https://www.cdc.gov/niosh/welding/about/index.html
• https://www.cdc.gov/niosh/npg/npgd0379.html
• https://www.osha.gov/chemicaldata/501
• https://osha.oregon.gov/OSHAPubs/factsheets/fs93.pdf
• https://welding.com.au/filler-metals/metal-cored-wires/fabcor-86r-fabcor%2086r