Backing Gas For Aluminum Welding. Managing aluminum welds involves a number of factors including choosing the right filler metal and shielding gas blend and ensuring your power source is dialed in correctly. Temporary backings can be made of materials such as copper stainless steel or segmented ceramic tiles.
For aluminum welding you should buy a shielding gas of pure argon which is the combination of argon and carbon dioxide CO2. The self-shielded flux-cored wires FCAW-S produce their own gas during welding. Managing aluminum welds involves a number of factors including choosing the right filler metal and shielding gas blend and ensuring your power source is dialed in correctly.
Preheat the base metal 14 thick and the backing plate when used at 200C 400F.
Purging is the introduction of a gas to remove contaminants and provide backing during welding. Both produce slag which must be cleaned away. What process should you use. Photos 5 6 and 7.