Welding Aluminized Exhaust Pipe. You can use this technique to weld exhaust pipes made from sensitive alloys like stainless steel. MIG welders are used when welding aluminized steel and and.
I dont feel it will break but again that will depend on the stress the exhaust will see. In particular this technique is used for welding exhaust pipes made from alloys such as stainless steel. If I had an exhaust system put on my car or truck they would no doubt weld the joints.
It helps to figure out what setting work best the best position you use and improve your technique.
The thicker 14 gauge wall makes for the best bang for the buck exhaust piping. Your base surface should be completely free of oils rust paint and dirt. I dont feel it will break but again that will depend on the stress the exhaust will see. To answer your two SPECIFIC questions no your weld will not be effected by the heat of the exhaust.