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Hi Gary, You can have the best of both worlds with some Mig machines. The Linclon SP 100 and 130 Models use CC ( constant current) on there Mig machines thus letting you also use Tig on the same machine. I don't know about the Miller Model you quoted. All you will need to buy is a Tig tourch and hose, a length of 150amp weld lead, rod holder and a regulator if not bought with the Mig setup. You can also stick weld with the Lincoln with small diameter rod. Tig is a very preciese control of arc and thus you can weld extremally thin materials or build up heavy welds with a given amount of "time". The weld time is slower with Tig but you also get a non cold start weld joint. Thus on a one pass 1" weld all the weld area can be considered for strength. Mig is fast, good control of arc, but cold laps for the first 1/4" to 3/8" of the weld joint. Cold lap is not complete penetration of the base metal. So it you were tying to weld a 1" long weld the first 1/4" of the weld needs to be ground out before another pass is made or if a 1" one pass weld is all you get, then the first 1/4" would not be counted for strength. On a critical weld we will spec a root weld(the first pass on the base metal) of Tig (GTAW) with maybe SMAW (stick) or GMAW (Gas Mig) as the follwing weld passes. If one weld method is all I could have, then TIG would be it!!! T_Bone
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