One solution with wing stays (if they are breaking near a weld) is to braze joints rather than weld them - this has been used successfully on bicycles for over 100 years. I know some will say 'lugged joints', but there are also thousands of lugless frames out there as well - VERY thin tubes taking huge forces (think front forks, the ends are a simple brazed joint consisting of a plate in a slot!)
All to do with the heat affected zone....... when welding takes place the metal near the weld can be adversely affected by the heat, causing it to break - the heat of brazing is much lower.
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