I have this MM250 that I was able to resurrect from the dead last month thanks to help from members on this list.
I am putting together a proposal for an aluminum project that calls for welding relatively heavy wall aluminum channel and I-beam into load stands for a trucking outfit. The problem is that my aluminum capabilities hardware wise are TIG and light spool gun (millermate 185) which I also need to adapt to the MM250.
I have always welded aluminum with one of these two methods. However this project will require heaver aluminum MIG capabilities than this. TIG is too slow anyway for this project.
Can I push aluminum wire through the MIG gun (It is a 12 or 15 footer)? I have always used 4043 wire when welding aluminum TIG or MIG spoolgun. What size wire should I go for to weld 3/16" structural shapes? The part also calls for welding 1/2" aluminum plate gussets to the structure. Can my MM250 handle this job?
Attached are pictures. Any help is appreciated and goes towards a good cause (keeping a roof over my head and food in the fridge).
Finally, notice in one of the pictures a special extruded shape is used for the end posts. Is this a special order item or would a metal supply house have this stuff? What do you think?