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Quality and microstructure of materials are strongly affected by the shapes of pores in solids, which are encountered in almost all the packaging, micro-electro-mechanical systems (MEMS), and manufacturing fields. This study theoretically analyzes the mechanisms of an entrapped micro-bubble as a pore in the solid. A phase diagram, as introduced previously to be satisfied by interfacial normal stress...
The effects of power density, concentration of volatile alloying element (magnesium, Mg), and welding speed on the mechanisms of fusion-zone defects, i.e., spiking and humping (and coarse rippling) during keyhole mode electron-beam welding of Al 6061, Al 5083, and SS 304 are investigated experimentally. Spiking represents a sudden increase in penetration beyond the average penetration line. Rippling...
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