电极直径对连续点焊熔核的影响

Abstract：The choice electrodematerial directly influences the quality resistance welding.The commonly used Cr-Zr-Cu alloy is widely employed in electrode manufacturing due to its excellent electrical conductivity and mechanical properties.However， in continuous spot welding operations，the wear the electrode tip leads to an increase in its diameter，which directly affects the nugget diameter and subsequentlythe quality the weld.To investigate this phenomenon in detail，employs ABAQUS stware to construct a simulation model for resistance spot welding 1.5mm thick 1Cr18Ni9Ti material. The study examines how variations in electrode diameter （6mm， 7mm ，and 8mm ）impact the temperature distribution during welding by simulating the changes in the temperature field.The simulation results indicatethat under fixed welding pressure and welding time conditions，as the electrode diameter increases，the temperature in the weld zone decreases，resulting in agradual reduction in nugget diameter. Notably，when the electrode diameter reaches 8mm，the temperature in the weld zone does not reach the melting point the metal， causing the nugget to disappear and the electrode to fail.

Keywords：resistancewelding； electrode diameter； nugget diameter；ABAQUS simulation

1序言

1Cr18Ni9Ti属于典型的18-8型镍-铬奥氏体不锈钢，具有良好的耐蚀性，广泛应用于航空航天、石油化工等关键领域[1，2]。（剩余7788字）