Resistance Spot Weldability of High Strength Steel Sheets for Automobiles and the Quality Assurance of Joints
Resistance Spot Weldability of High Strength Steel Sheets for Automobiles and the Quality Assurance of Joints
复制标题
汽车用高强度钢板电阻点焊性及接头质量保证
DOI：
10.1007/bf03266555
复制
发表时间：
2007
影响因子：
2.1
通讯作者：
K. Matsuyama
中科院分区：
文献类型：
--
作者：
H. Oikawa;G. Murayama;S. Hiwatashi;K. Matsuyama
研究了汽车用高强度钢板的电阻点焊工艺及接头质量保证技术。与低碳钢板点焊相比，高速钢板点焊的适宜焊接电流范围向低电流侧移动，且受电极力的影响。焊接区的维氏硬度随母材碳含量的增加而增加。接头的拉伸剪切强度（TSS）随着熔核直径、板厚和母材强度的增加而增加。接头的横向拉伸强度（CTS）随着熔核直径和板厚的增加而增加。而基体钢的强度和碳当量则出现峰值。疲劳强度不随母材强度的增加而增加。合金化热镀锌钢板点焊时的适宜焊接电流范围较裸钢板向大电流方向移动。合金化热镀锌高速钢电极寿命超过3000点，达到实用水平。在点焊过程中，通过电流和电压估算熔核直径，可以保证接头强度。
Resistance spot weldability of high strength steel (HSS) sheets for automobiles and the quality assurance technique of joints were investigated. The suitable welding current range in spot welding of HSS sheets shifted to the lower current side compared with that of mild steel sheets and it was affected by the electrode force. Vickers hardness at the welded zone increased with an increase of base steel carbon content. Tensile shear strength (TSS) of joints increased with an increase of nugget diameter, sheet thickness, and base steel strength. The cross tension strength (CTS) of joints increased with an increase of nugget diameter and sheet thickness. However, it showed a peak for base steel strength and carbon equivalent. Fatigue strength didn’t increase with base steel strength. The suitable welding current range in spot welding of galvannealed HSS sheets shifted to the higher current side compared with that of bare HSS sheets. Electrode tip life for galvannealed HSS sheets was over 3 000 points and it was a practical use level. It’s possible to assure the joint strength by estimating the nugget diameter using current and voltage during spot welding.