Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Re: metal thickness and mig welding
Congratulations! A swell Christmas present!
If you bevel the edges and make multiple passes you can go as thick as you want. Just as a test I welded two pieces of 5/8 plate together with my 120 volt machine. On testing it bent about 45* and then the base metal broke about a quarter inch from the weld. And I think that wouldn't have happened had I post heated it.
If you make a straight butt weld I would think that it would go to 10 gauge, if not more, with proper technique. The only way to know is to try it. Weld two pieces together and then see if you can break the weld. The manual that comes with the welder should illustrate destructive testing.
That will not only tell you what the machine will do, but also how the operator is doing.