メッキ鋼板の点溶接(第 1 報) : 溶接条件と機械的性質について

概要

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This paper is concerned with the weldability of spot welding nickel, copper, chromium and tin plated steel in 1mm thickness. The apropriate welding condition range, mechanical properties, hardness of the weld nugget, nugget shape and the voltage drop across electrodes are studied and the optimum welding conditions are determined for each plated steel. As the result of investigation, the foloowing are concluded. (1) Welding condition is greatly dependent of the kind of metal plated on steel. Higher welding current is required for the tin and the copper plated steel and lower current for the chromium plated steel comparing with the bare steel. High electrode force is recommended for spot welding of the chromium plated steel. The time necessary to produce a nugget is longer in the case of plated steels than of the bare steel and consequently longer weld time is recommended for spot welding plated steels. (2) When electrodes with the same shape and dimensions are used, tensile shear strengths of plated steels are nearly equal to that of the bare steel, but cross tension strengths of the nickel and the chromium plated steel are considerably low. (3) The welding conditions depend a little on the plating thickness over the range from 2.5 to 10μ in thickness. (4) The nuggests of the nickel, copper and chromium plated steels are high in hardness and the hardness of the weld nugget of the tin plated steels is about the same as that of the bare steel.
1968-11-25