As I fuse 6063,find cracks in it. 4043 was recommended as tig feeler wire but I tried 4047 ( 5% Si)it worked well.Is it a good alternate? or may create problem in long run? Pl share the experience.
4043 would be your first choice to use on this material unless you plan on anodizing the part, then 5356 would be your next choice. Altough if your welding on super thin stuff, then 4047 might be slightly more user friendly then 4043.