606 ヒュージング用モリブデン電極の劣化に及ぼす材料因子(OS4-(2)オーガナイズドセッション《材料と組織》)

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In these years, connecting wires are being more complicated in home electric appliances, and cars are being more electrically equipped. Then, fusing is being applied more frequently as a joining method between electrical parts and wires, where plastic deformation plus bonding and melting plus breakage occur simultaneously in the core metals and surrounding insulating layers in the junction, respectively. For fusing, spot welding machines are used with tungsten or molybdenum electrodes. Since the work is usually highly electrically conductive such as copper and aluminum, resulting in extremely large electric current, degradation of the electrodes is prone to occur, whereas the mechanism has not been elucidated so far. In this study, to elucidate the mechanism, material factors affecting degradation of molybdenum electrode were investigated. Electrode surface after joining test was observed with an SEM therefore center of electrode surface showed Cracks were found in the center of the electrode surface.
2011-08-26