Unable to get consistent slag cover - Flux Core

Tue, 31 Aug 2021 09:08:17 GMT

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Equipment: Lincoln Electric MigPak 140Polarity: DCENWire: NR-211-MPSettings: Have tried various settings, drag, angle, travel speedI've been welding as a hobbyist for couple months now in my own garage, started out with a 2 hour MIG class at a community center then started doing both flux core and stick.  I find flux core the most challenging, harder to see the puddle(dark) and the beads don't look as good.  With 3/32 stick, I can see the orange puddle real nicely and the slag chips off very nicely as well.The problem that I'm having with flux core is slag coverage, I think it happens all the time when I'm welding in a flat horizontal position just running beads.  As you can see from the pictures below, the top part of the bead is bare of slag.  I've watched the Lincoln's FCAW troubleshooting video and have tried adjusting wire speed, travel speed, and CTWD - no matter what I do, I just can't get full slag coverage.But then I noticed after watching Miller's official video on flux core welding, it appears to have the same issue in Horizontal(Picture 3), any suggestions?  Is it just nature of flux core welding?
Reply:Slow down your travel speed a little. The toes of your bead should wash into the base metal betterJasonLincoln Idealarc 250 stick/tigThermal Dynamics Cutmaster 52Miller Bobcat 250Torchmate CNC tableThermal Arc Hefty 2Ironworkers Local 720
Replyid more welding today.  Same result it’s only happening on flat horizontal beads like that.   Did few t-joints and got perfect slag coverage.  I’ve seen a few old posts on here about the same thing, maybe it’s a wire thing.
Replyon't worry about slag more than the weld.  I agree that you need to slow down or crank up the wire to fill the cut better.  Do right by the weld and the slag will do it's job.I'm no professional but I did learn to weld on a lincoln 110v wire feed and 211 fluxcore.  I used 045 wire but probably should have used 035.  I turned the machine to high setting (D on mine) and set the wire feed speed as high as the machine could handle.  You'll still need to manipulate the gun to put enough heat into the work.  "C's" or circles, weave or stich, do something to pour heat into the edges and get enough fill into the weld.I made BBQ pits, tools, repaired equipment, and even made a coupler to tow a jeep across the state with that thing.  Damn did I hate its duty cycle!Last edited by mbarasing; 11-28-2020 at 03:08 PM.
Reply:Originally Posted by snoeproeSlow down your travel speed a little.

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