プロジェクション溶接現象についての研究(第 1 報) : ナゲット形成におよぼす電流, 加圧力の影響

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Using embossed projection, influence of weld current and electrode force on nugget formation was approched basically from a viewpoint how to supply the input power to the projection part in order to form efficiently the nugget and obtain the good weldment with stable mechanical strength. The power source with low impedance circuit was prepared in this experiment. For the weld current near over a suitable value, the tensile shear strength became a stable value with small amount of scatter and the weld failed only in the tear fracture. Increasing the weld current, the initial nugget with the diameter corresponding to that of the cold collapsed area became early formed and the saturation value of nugget diameter increased. Under low electrode force where the projection is scarcely collapsed, the initial small nugget was stably formed in the center of the projection part and grew up around its center near the critical weld current. With excessive weld current, the initial splash during collapse of projection did not only occur but the splash in the latter half weld time. The welds even for this condition, however, were found to have stable tensile shear strength with small amount of scatter and to fail in the tear fracture. Scuh a critical weld current increased with electrode force due to the enlargement of the initial current area. Under high electrode force, the periphery of projection was tend to be initially heated, so that the heat affected zone or the nugget was found to be formed like a torus at the initial weld time.
社団法人溶接学会の論文
1977-07-05

プロジェクション溶接現象についての研究(第 1 報) : ナゲット形成におよぼす電流, 加圧力の影響

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