It can depend on how you are attaching them as to how the design pans out. My experience with stays that clamped on the hub (mgb based kit) was similar (ie welds failed.) To cure it I made some solid round 'plugs' about 4" long which I heated up red and flattened the end and drilled for mounting. The other end of the plug had the last 1.5" turned down so it was tight fit in the steel tube (seamless gas tube) and the parts were brazed together. The logic being that cycle frames (very thin and light) take enormous stresses (think bike forks) and have been traditionally made this way. At the top end I also used a tube bender to bend to 90 degrees so no 'corners' as stress raisers. It worked.
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