Linear analysis among minimum nugget diameter and minimum shear strength and plate thickness in resistance spot welding

电阻点焊最小熔核直径及剪切强度与板厚的线性化分析 Linear analysis among minimum nugget diameter and minimum shear strength and plate thickness in resistance spot welding 张文扬 ZHANG Wenyang 1 first-author 郭绍庆 GUO Shaoqing 1 梁海 LIANG Hai 1 李能 LI Neng 1 孙兵兵 SUN Bingbing 1 中国航发北京航空材料研究院 中国航发北京航空材料研究院 Beijing Institute of Aeronautical Material,AECC Beijing Institute of Aeronautical Material,AECC 以现行的电阻点焊航空工业标准、国家标准、国家军用标准以及国际标准为基础,总结了铝合金、钛合金、钢及高温合金等合金电阻点焊工艺中,最小熔核直径及最小剪切强度与板材厚度的关系,结论显示:对于各种合金在各种热处理状态下的电阻点焊,板厚在1.2～1.5 mm范围内存在分界点,在该分界点以左及以右,最小熔核直径及最小剪切强度与板厚均大致呈线性关系(对于极限强度在1 035～1 275 MPa和大于1 275 MPa的高温合金材料,在板厚2.5 mm以右,还需要再细分一段),同时提出了以强度对材料进行系统分类的原则。该结论可以对各种板厚新材料以及标准中未涉及到的板厚的电阻点焊的最小熔核直径及最小剪切强度提出理论预测。 Based on the current aviation industry standard, national standard, national military standard and international standard of resistance spot welding, the relationship between minimum nugget diameter, minimum shear strength and plate thickness in resistance spot welding of aluminum alloy,titanium alloy, steel and super alloy is summarized. The conclusion shows that for resistance spot welding of various alloys under various heat treatment conditions, there is a boundary point in the thickness range of 1.2 ～ 1.5 mm. At the left and right of the boundary point, the minimum nugget diameter and minimum shear strength are approximately linear with the plate thickness（for ultimate strength in 1 035 ～ 1 275 MPa and more than 1 275 MPa of high temperature alloy material, the thickness of 2.5 mm to the right, need to be subdivided）, at the same time, strength of materials is put forward as the principle of classification system. This conclusion can be used to predict the minimum nugget diameter and the minimum shear strength of resistance spot welding of various plate thickness of new materials and those not covered in the standard. 电阻点焊 最小熔核直径 最小剪切强度 线性化 标准 resistance spot welding minimum nugget diameter minimum shear strength linearization standard TG453.9 2022-03-08 11 51