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Posted by stryped on April 28, 2008, 8:17 am
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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?
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Posted by Don Foreman on April 28, 2008, 12:04 pm
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On Mon, 28 Apr 2008 05:17:52 -0700 (PDT), stryped
>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?
MIG does not have slag so there's no worry about inclusions or
cleaning between passes.
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Posted by SteveB on April 28, 2008, 6:20 pm
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>>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?
>
> MIG does not have slag so there's no worry about inclusions or
> cleaning between passes.
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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Posted by Don Foreman on April 28, 2008, 6:00 pm
Please log in for more thread options On Mon, 28 Apr 2008 14:20:05 -0800, "SteveB"
>
>>>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?
>>
>> MIG does not have slag so there's no worry about inclusions or
>> cleaning between passes.
>
>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.
Agreed. I assumed that any welder will be watching the puddle.
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Posted by SteveB on April 29, 2008, 2:26 am
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> On Mon, 28 Apr 2008 14:20:05 -0800, "SteveB"
>
>>
>>>>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?
>>>
>>> MIG does not have slag so there's no worry about inclusions or
>>> cleaning between passes.
>>
>>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.
>
> Agreed. I assumed that any welder will be watching the puddle.
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
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>you lay a center bead, then stringer beads beside the origional bead.
>Does that still apply to mig?