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This study theoretically identifies the conditions for the keyhole collapse during drilling with a high intensity laser beam. Laser drilling is widely used in components, packaging and manufacturing technologies [1,2]. The approach adapted is to probe the quasi-steady, one-dimensional supersonic flow behavior of the two-phase, vapor-liquid dispersion in a vertical keyhole of varying cross-section,...
In resistance spot welding (RSW) thin workpieces held by two electrodes are joined via solidification of the molten nugget induced by heat generation from electrical resistances in workpieces and at the faying surface. Solidification starts after welding current is turned off, and heat is then transferred through the electrode to the coolant hole. RSW has been used in electronic, optical and medical...
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