Posted by 135 Fan on January 29, 2010 at 01:21:02 from (68.149.56.30):
In Reply to: Welding question posted by NCWayne on January 28, 2010 at 23:41:57:
Stick is fool proof when done by a qualified welder. MIG has too many variables. In structural welding short circuiting transfer MIG isn't even qualified. Spray transfer is but most home owners with a MIG set up don't use it as it needs high amps and is hard to use out of position. Stick puts more heat input into the steel which results in less of a quenching effect and the slag covering slows the cooling rate. Stick is slightly softer than MIG as well. You'll notice a difference when grinding welds down. Most, but not all new machinery is done by MIG or flux-core because it is faster. Factories use high end welding machines with spray transfer and pulsed spray transfer. Not many home owners have that kind of equipment. There are very few multiple pass MIG welds. I think that at least 8 out of 10 welders would rather stand behind a 7018 weld than a MIG weld. That comes from experience. On critical work like pressure vessels, MIG is only used for root passes and usually has a 7018 hot pass before being finished with sub-arc. Nozzles on vessels are usually filled up with 7018. Flux-core is starting to be used more on vessels but stick still dominates. Although the specs. look similar between MIG and 7018, if you compare them side by side, 7018 will have better as welded properties such as low temperature impact strength. I'm sure the other qualified welders on here can add more but I'd take 7018 over MIG for the strongest weld possible every time. Dave
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