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      • 스폿용접 간극이 용접성에 미치는 영향에 대한 연구

        임재규(Jae-Kyoo Lim),양승현(Seung Hyon Yang),국중하(Joong Ha Kook) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8

        The automobile is made up of thousands of parts. Some parts are formed by pressing and combined by spot welding. Among them, steel plate of fuel tank is formed in the metal mold and bending parts are jointed by spot and seam welding. To find weldability lobe of spot welding, clearance between two welding specimens was made and after spot welding, weldability is evaluated by means of tensile shear load, nugget size and shape. Specimen used in this study was a mild steel of 1.2mm thickness and electrode was Cu-Cr alloy of 6mm diameter. When spot welding started, the clearance of two specimens was changed 0mm, 3mm and 5mm step by step. The fractured surface of specimen after this test was observed Optical Microscope to measure microstructure and nugget shape. When clearance of two specimen was 3mm and 5mm, strength and nugget size was decreased and nugget shape was not clear.

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