Tubular upper arms-I feel lucky tonight

alot of you guys are over engineering this - the ball joint cup is threaded - you cant weld it in there.

all you need is a good weld - the butt weld is fine - as long as there is penetration - even stick welding it would yield more strength then you need in that location.

the bottom line is the weld should not break - the weak point IMO should be the ball joint sleeve should distort - but I'm no engineer and have not done any testing.