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首页> 外文期刊>Journal of Korean Institute of Metal and Materials >Effect of H Contents and Welding Current on the Mechanical Properties of Electrical Resistance Spot Welds in Complex-Phase Steel Sheets
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Effect of H Contents and Welding Current on the Mechanical Properties of Electrical Resistance Spot Welds in Complex-Phase Steel Sheets

机译：H含量和焊接电流对复相钢板电阻点焊力学性能的影响

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摘要

When complex-phase (CP) steel with a tensile strength of more than 1 GPa grade is joined using resistance spot welding (RSW), the optimum Ti content should be chosen in order to satisfy the weldability and mechanical properties. Therefore, in this study, the effect of the Ti content (0-300 ppm) on the tensile-shear load of the RSW in CP steels is investigated. Because the resistivity of the base metal is independent of the Ti content, it does not affect the nugget diameter. Regardless of the Ti content, the specimens under 5t~(1/2) (t = sheet thickness) are fractured in the interfacial failure mode. In the low welding current condition (lower than 6.4 kA), the measured nugget diameters are smaller than the calculated critical nugget diameter regardless of the amount of Ti addition in order that the fracture mode is interfacial failure. Pull-out failure occurs at the softened zone, which is the boundary between the base metal and heat-affected zone. The tensile-shear load of the specimen failure in the pull-out mode increases as the fractured diameter and hardness of the softened zone increase. The shear load is only dependent on the fractured diameter.
机译：当使用电阻点焊（RSW）连接抗拉强度超过1 GPa级的复合相（CP）钢时，应选择最佳的Ti含量，以满足可焊性和机械性能。因此，在这项研究中，研究了Ti含量（0-300 ppm）对CP钢中RSW的拉伸剪切负荷的影响。由于贱金属的电阻率与Ti含量无关，因此不会影响熔核直径。不论Ti含量如何，在5t〜（1/2）（t =板厚）以下的试样都以界面破坏模式断裂。在低焊接电流条件下（小于6.4 kA），无论Ti的添加量如何，所测量的熔核直径均小于计算的临界熔核直径，以使断裂模式为界面破坏。拔出故障发生在软化区，该软化区是母材和热影响区之间的边界。拉出模式下试样破坏的拉伸剪切载荷随着软化区的断裂直径和硬度的增加而增加。剪切载荷仅取决于断裂直径。

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