Laser beam and electron beam welding: Know the difference in direct current and alternating current for tig welding. Wow!...Beautiful Tig! Welding & Project Ideas I’m gonna set it up on a positioner and i’m gonna compare penetration, same amperage, 50 hertz, 250 hertz. How to tig weld aluminum tubing . Gather the right electrode, rods, and shielding gas. The torch was used successfully for welding magnesium until november of 1942 when northrup invented the “heliarc” to combat the problem of. Most of them hook up a switch on the torch and pulse weld manually by going from on to off again and again slightly overlapping puddles. Know when to use dc and when to use ac for aluminum. Welding aluminum requires a thorough understanding of the tig welding process and also requires a tig torch. I’m gonna compare 50 hertz to 250 hertz. Beam welding techniques are commonly used for aluminum. I'm having trouble getting penetration on this 1/8th inch thick aluminum squa...