The attached image is of a trial done to see whether I thought 2 bolts could be welded head-to-head to make a replica of the specialized bolt. The actual parts were scrap spring u-bolts. For a finished product I would have used a belt grinder rather than an angle grinder for a flatter finish on the weld. The weld area was well grooved for penetration, the weld seems strong although not formally tested and the heat was not enough to even slightly loosen the rust bond of the nuts on the shaft so I doubt it did any harm to the properties of the metal.
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