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采用有限元分析和物理模拟相结合的方法,研究了环形和孔形两种电极点蚀形貌对铝合金AA5182电阻点焊的影响。结果表明,环形点蚀使两试件间接触半径增大,电流幅值基本不变而峰值略外移,所得熔核直径略有增大;孔形点蚀使试件间接触半径增大更为显著,电流密度降低,且由于此时界面中部没有电流流过,材料不能熔化,只能形成环形熔核。孔形点蚀使点焊接头强度大大降低,其对接头强度的不利影响远大于环形点蚀。
The effects of ring-shaped and hole-shaped electrodes’ pitting morphology on resistance spot welding of AA5182 aluminum alloy were investigated by means of finite element analysis and physical simulation. The results show that the annular pitting corrosion increases the contact radius between the two specimens, the amplitude of the current does not change and the peak value shifts slightly, and the diameter of the obtained nugget slightly increases. The pitting corrosion increases the contact radius between the specimens Is significant, the current density is reduced, and since no current flows through the middle of the interface at this time, the material can not be melted and only the toroidal nugget can be formed. Hole pitting causes the spot weld joint strength to be greatly reduced, which adversely affects the strength of the joint far greater than annular pitting corrosion.