304不锈钢与6061铝合金搅拌摩擦焊温度场数 值模拟

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Abstract： The traditional fusion welding method cannot overcome the interface brittleness problem caused by aluminum-steel intermetallic compounds， resulting in poor weldabilityof the composite structure of stainless steel and aluminum alloy.Therefore，this paper employs numerical simulation methods to investigate the friction stir welding of stainlessteel and aluminum ally.The welding temperature field is of great significance influence on the microstructure and the macroscopic morphology.A heat source model and boundary conditions suitable for friction stir welding of dissimilar metals were established using commercial finite elementsoftware.The quantitative relationship between welding speeds andthe temperature fieldoffriction stir welding of304 stainlesssteel and 6061 aluminum alloy was analyzed.The results show that the results of numerical simulation are basically consistent with theresults of infrared thermal imaging experiments，indicating that the established heat source model has high calculation accuracy.By comparing the temperature distribution on both sides of 3O4 stainless steel and 6061 aluminum alloy，it shows that the peak temperatureofthe304 stainless steelside ishigherthan the peak temperature of the 6O61 aluminum side during friction stir welding.

Keywords：aluminum-stee dissimilar metals;welding speed;infrared thermal imaging; transient temperature field; macro morphology

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搅拌摩擦焊是指利用高速旋转的搅拌头与工件摩擦产生的热量使被焊材料局部塑化，被塑性化的材料在搅拌头的作用下由前部流向后部，冷却后形成致密的固相焊缝。（剩余6739字）