By 803056
Date 06-12-2018 12:57
Edited 06-12-2018 13:02
I doubt this is a weldable grade of aluminum. The zinc is going to be a problem because it oxidizes and fumes at a relatively low temperature. 7075 aluminum only contained around 8 to 10% zinc and is considered to be a very bad bet if attempting to weld it with any traditional arc welding process. If 8 to 10% zinc is a problem, higher percentages will probably make it worse.
If there is a chance of success, I would place my money on oxy-acetylene torch welding. The temperature of the base metal can be closely controlled and is considerably lower than that of a welding arc. The zinc would be less likely to fume at the lower temperature. I would try an alloy such as 4043 which has a melting close to that of 1100 aluminum. This is a long shot. Hopefully someone with experience with your particular alloy will jump in on the conversation.
Good luck - Al