I am a newbie and have been reading about when arc weldign sometiems you lay a center bead, then stringer beads beside the origional bead. Does that still apply to mig?
- posted
15 years ago
Mig welding
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- posted
15 years ago
MIG does not have slag so there's no worry about inclusions or cleaning between passes.
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15 years ago
Agreed. I assumed that any welder will be watching the puddle.
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15 years ago
If you are welding MIG on thicker metal, you can get a very good looking multipass weld that isn't worth a hoot. Problem is that the electrode does not melt adjacent metal. Additional passes are pretty, and give it a little more sticking power, but still destructive testing can have it shear off right at the metal, and you will see no melting. Be careful of that.
With stick rods, you can "boil" out inclusions or slag from previous passes, and it is easily visible. MIG has no visible slag, so with MIG, it is different.
Steve
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15 years ago
Lots of welders out there. "Good" welders know how to watch the puddle for undercut, arc length, spattering, boiling out slag inclusions from previous passes or unwanted particles, knowing how much metal to lay down, particularly on vertical travel up wide joints, etc. A lot of MIG can be done and work by just pointing and pouring metal in there, as the case of ornamental metal, and things that don't have a lot of torsion, flexing, pulling, or loading. Very little of the MIG welding I have seen, even on commercial trailers had any side to side or weave motion at all. Just straight line, and not side to side, pausing on each end.
Lots of welders I have known have just watched the clock.
Steve