Problem NO: 13

A resistance seam-welding operation is performed on two pieces of 2.5-mm-thick austenitic\nstainless steel to fabricate a container. The weld current i

A resistance seam-welding operation is performed on two pieces of 2.5-mm-thick austenitic

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stainless steel to fabricate a container. The weld current in the operation is 10,000 amps, the weld

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duration = 0.3 sec, and the resistance at the interface is 75 micro-ohms. Continuous motion welding

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is used, with 200-mm-diameter electrode wheels. The individual weld nuggets formed in this

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RSEW operation have diameter = 6 mm and thickness = 3 mm (assume the weld nuggets are

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disc-shaped). These weld nuggets must be contiguous to form a sealed seam. The power unit

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driving the process requires an off-time between spot welds of 1.0 s. Given these conditions,

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determine (a) the unit melting energy of stainless steel using the methods of the previous chapter,

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(b) the proportion of energy generated that goes into the formation of each weld nugget, and (c) the

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rotational speed of the electrode wheels

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