CAJ | 학술논문

对DX54D冷轧IF钢镀锌板进行点焊试验，研究了焊接工艺参数及电极端面尺寸对镀锌板点焊性能、焊点拉剪性能及熔核尺寸的影响。结果表明：随着焊接电流的增加，焊点的拉剪强度和熔核尺寸均增大，当电流过大而发生飞溅时，焊点的拉剪强度和熔核尺寸开始降低。随着电极端面半径的减小，电极与工件的实际接触面积减小，引起电流密度升高，导致在相同焊接时间条件下得到相同熔核尺寸和焊点拉剪强度所需焊接电流降低。
대DX54D랭알IF강도자판진행점한시험，연구료한접공예삼수급전겁단면척촌대도자판점한성능、한점랍전성능급용핵척촌적영향。결과표명：수착한접전류적증가，한점적랍전강도화용핵척촌균증대，당전류과대이발생비천시，한점적랍전강도화용핵척촌개시강저。수착전겁단면반경적감소，전겁여공건적실제접촉면적감소，인기전류밀도승고，도치재상동한접시간조건하득도상동용핵척촌화한점랍전강도소수한접전류강저。
The spot welding test for the cold rolled DX54D IF galvanized steel sheet is car-ried out. The effect of welding parameters and the electrode tip size on the spot welding perfor-mance for a galvanized steel sheet, the tensile shearing property by spot welding and the nugget size is studied. The experimental results show that both the tensile shearing strength of welding spots and the nugget size increase with the increase of welding current. The tensile shearing strength and the nugget size will tend to decrease when welding spatters occur due to the excessive current. The current density will increase with the decrease of the radius of the electrode tip as well as the decrease of the actual contact area between electrode and workpiece, which can lead to decrease the welding current for the same nugget size and the tensile shearing strength of welding spots under the same welding time.