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Stud-welded anchors on a bridge girder. Drawn arc stud welding joins a stud and another piece of metal together by heating both parts with an arc. The stud is usually joined to a flat plate by using the stud as one of the electrodes. The polarity used in stud welding depends on the type of metal being used. Welding aluminium, for example, would ...
Poor welding process of Nelson studs; Porosity and lack of fusion in the stud–beam joint; Insufficient Nelson studs in the beams spanning the bridge assembly; Use of different types of concrete in the girder; Unfinished or improperly executed welds; and; Inadequate supervision and dimensional control in fillet welds.
Friction stud welding is a solid phase welding technique involving a stud or appurtenance being rotated at high speed while being forced against a substrate, generating heat by friction. The metal surfaces reach a temperature at which they flow plastically under pressure, surface impurities are expelled and a forged weld is formed.
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The first of an eventual four locomotives of this class to be brought to the Nelson Section, W F 404, arrived in 1915 and replaced D 144, one of the original locomotives on the Nelson Section. It was followed in turn by W F 62 in 1919 and W F 395 in 1925, with the last, W F 397 arriving from Auckland in July 1937.
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