How To Welding Cast Aluminum. For smaller workpieces consider gas welding etc. TIG welding cast aluminum should always be done with pure argon gas not an argonCO2 mix as is common with MIG welding.
However in addressing the question of casting weldability we must consider two aspects. TIG welding cast aluminum should always be done with pure argon gas not an argonCO2 mix as is common with MIG welding. The most common aluminum casting alloys are the heat-treatable 3XX0 series such as 3560 3570 and 3190.
For welds needing deeper.
When your trying to weld the pinhole you are applying heat to the rim and subsequently the inside of the tire As this heat is applied the gas inside the tire air if you may is expanding and poof. 5 Preheat the casting to 400 to 500 F for up to two hours before welding unless the casting is a heat-treated alloy in which case keep the temperature under 275 F. A beginners guide to welding brazing aluminum with alumiweld rodsLinks to the Tools and Materials Leah Uses in This VideoAlumiweld Brazing Rods. The fractured edges are work-hardened and are brittle so the material on the edges of the crack should be removed as well.