1 , cleaning: clean-up of the weldment with mechanical cleaning is the best, the purpose is to remove the surface oxide film . 2 heating : a thick pieces focus heats up when you can weld a little far Aluminium Alloy Welding Wire away from some distance away , without having direct welding mouth . 3 , cutting : up to 400 degree temperatures , lower wire . Try vertical angle spot welding at the point of momentary flame burn at the end of the wire slightly Tip melt molding , welding wire tip burn , rather than deliberately burned wire .