Tuesday, Dec 02, 2008 at 10:40
This is possibly nit picking, but I think a few thing you said could be made a little clearer.
Are you a retired stick welder?
I would also recomend stick welding to a beginer as there is a lot less chance of cold lap. You can do a lovely looking MIG weld that wont hold, but a bad stick weld generally looks crap.
I think the only use for gasless MIGs is on light gauge material where wind is a problem eg ..wall framing on site etc.
Im also a fan of stick welders but you cant beat MIGs for speed and ease in the right situation eg. all types of RHS, structural beams etc and new or clean metal, but inside a workshop.
As for-"When people say that this or that welder will weld certain thicknesses of material, this is not so. If your material is prepared correctly you can weld any thickness by doing multiple layers of weld metal"
I dont think that would be the best advice, It is true to a point if people prepare the joints and preheat , but I doubt anyone using a 90 amp welder would know much about this? Remember a 90 amp welder will be running flat out burning 0.9 wire.
The duty cycles on these little welders are so low you would have to stop and start that often you would end up with a heap of cold starts all the way through the join. And I doubt you would keep up with the heat dispersion from heavy plate anyway without continous pre-heating with an oxy.
It wouldnt be a safe way to go and certainly wouldnt be practical.