TIG Welding 6061 vs. 7005
Can someone tell me if there are any key difference when welding these two types of aluminum?
I am assuming that I should not be able to move from one material to the other with out some weldability impact.
I weld my seat stays together near the seat tube prior to welding them to the seat tube. I cant get them to weld together now.
Basically I fixture the two stays up and connect them at the top. This allows me to assure they are flat and the brake mounts are perfectly aligned. Then I mitre the two stays just one time and it fits perfectly.
The stays are thinwalled 7005. It seems that the torch just wants to burn through it rather than puddle. However, I have no control of the beads. They have black specs and the TIG Cone seems to have a "spackling" noise rather than a smooth sound. However, if I move to some small 6061 plate as a test everything is fine. If I am welding heavier gauge butted up to on the seat tube or drop out it is not as bad. I move the puddle onto the thin stays and make it work. Not as smooth but welds, but it works.
I called the tube supplier and they tell me that no other frame builder has had the same problem.