[TheForge] MIG Welding question

Mon Jul 22 09:17:00 2002

Jeremy,
C3 on a Lincoln Weld-Pak 100 sounds too hot for the work your are doing, 
believe it or not. On thin guage material you shouldn't expect to run a 
continuous solid bead, it is more a matter of a spray transfer-like 
weld. Try a few samples at a lower setting, and another experiment to 
try is to raise the feed rate a litttle higher than the recommended 
feedrate for the amperage setting. You will force the welder to make a 
"Colder" weld, that will be less likely to burn through your rings and 
given the application, and the fact that you were able to justify a side 
grinder for clean up, a "lumpy" weld is better that  than  burning through.
Ray Miller
Cincinnati

Jeremy Seip wrote:

> Not quite a blacksmithing project, but if I do a good job here my new 
> wife is more likely to let me set up a full shop. :-)
> I'm fabricating a large trellis for a climbing vine, the plan calls 
> for a frame of 3/4" square tubing lined every 4 inches by a 3/8" ring 
> of  wire (about clothes-hanger wire thickness).   Eventually a mesh 
> will be wroven across the trellis through these rings to form the 
> actual climbing surface.The only welder I have access to is a Lincon 
> MIGPack 100.
> Bad ascii art:
>            o                  o              o               o         
> Rings
>       =================================  Tubing
> The problem is while I've taken classes on oxy-acetylene and stick 
> welding, I'm a newbi with MIG, and I'm destroying about every 5th ring 
> by burning a big part of it away.  So far I've played with the wire 
> feed speed and the amperage (currently amperage "C" and feed speed of 
> 3 for those who know this welder) but I'm still having problems with 
> the relationship between these two.  A second issue is how best to lay 
> the bead. I'm working on a spot-like weld, starting the bead a little 
> bit away from the ring and then moving the puddle against the ring and 
> hopefully fusing everything together before the ring melts.
>
> On the plus side I was able to justify getting a Dewalt Angle grinder 
> to grind off the bumps.
>
> Anyway, any advice other than "It can't be done like that, what were 
> you thinking?" would be greatly appreciated.
> Thanks!
>         Jeremy
>
> -- 
> Jeremy Seip
> [email protected]
> http://www.home.earthlink.net/~jseip
>
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