| The first two pictures appear to show a failure at the weld between the bushing sleave and the web of the arm. The last photo appear be a failure of either the web or the adjustment mechanisim. Weld failure may be related to the weld process, or it may be due to stress concentration on the undressed weld. Looking at the pictures on Chip's website, the welds on these arms apear to be fillet welds. They should be full penetration welds preferably with the end of the web beveled 30-45 degrees. Done this way, and assuming the proper execution, the weld should be at least as strong as the metal pieces. It would also be better if the weld were dressed to prevent stress concentration. It is well known that an undressed weld of this type acts as a stress concentrator and that this can lead to weld failure. Ideally, the weld bead should be ground down to give a smooth concave radius between the joint pieces. The failure shown in the third photograph is actually more distrubing as it appears to be a failure of the web at the point of adjustment. Given the design of these arms, there is little that can be done other than making this area stronger.
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