29.7 Quality problems are occurring in a resistance spot-welding operation in the fabrication of steel containers....
29.7 Quality problems are occurring in a resistance spot-welding operation in the fabrication of steel containers. The steel is 2.4-mm (0.094-in) thick low-carbon sheet steel. The main problem is incomplete fusion of the spot welds, in which the weld nuggets are very small and susceptible to separation. In some cases, weld nuggets do not even form. Without knowing any more about the operation, make several recommendations that might solve the problem.
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29.7 Quality problems are occurring in a resistance spot-welding
operation in the fabrication of steel containers....
A resistance seam-welding operation is performed on two pieces of 3-mm-thick austenitic stainless steel to fabricate...
A resistance seam-welding operation is performed on two pieces of 3-mm-thick austenitic stainless steel to fabricate a container. The weld current in the operation is 12,000 amps, the weld duration = 0.25 sec and the resistance at the interface is 90 micro‑ohms. Continuous motion welding is used, with 250-mm-diameter electrode wheels. The individual weld nuggets formed in this RSEW operation have diameter = 8 mm and thickness = 4 mm (assume the weld nuggets are disc‑shaped). These weld nuggets must...
A resistance spot-welding operation performs a series of spot welds between two parts of sheet steel...
A resistance spot-welding operation performs a series of spot welds between two parts of sheet steel that are each 1/8 in thick. The steel has a unit melting energy = 130 Btu/in3. Weld duration is set at 0.25 sec, and current = 11,000 amp. The weld nugget has a diameter = 0.30 in. Experience has shown that 50% of the supplied heat melts the nugget, and the rest is dissipated. If the electrical resistance between the surfaces is 125 micro-ohms,...
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