| http://www.w3.org/ns/prov#value | - For example, a periphery 28 of the two sheets 22, 24 of the preform 20 illustrated in FIG. 2 is connected by a weld joint 30, which can be formed by various welding processes, including resistance seam welding, friction stir welding or other types of friction welding, fusion welding, gas arc welding, laser welding, and the like.
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