以1.8mm厚304和430异种不锈钢板材为研究对象,利用COMSOL软件建立了搅拌摩擦焊热源三维有限元模型,对304和430异种不锈钢搅拌摩擦对接焊接的温度场分布进行分析,研究搅拌头转速和行进速度对峰值温度变化的影响规律。模拟结果表明:热源中心的峰值温度随着搅拌头旋转速度增大而升高,随着行进速度增加而降低。搅拌头旋转速度为800 r/min和行进速度为15 mm/min时,峰值温度随着时间先增加后趋于稳定值约1 040℃,该峰值温度出现在靠近轴肩后侧的区域。430不锈钢侧温度场的扩展程度相较于304不锈钢较大,温度分布较为均匀,有限元预测的温度场与实测结果吻合较好。
Based on 1.8 mm thickness 304 and 430 dissimilar stainless steel sheets,the three-dimensional finite element model for heat source of friction stir welding is established by using numerical simulation software COMSOL. The temperature field distribution of friction stir butt welding of 304 and 430 dissimilar stainless is analyzed, and the effects of the rotation speed and welding speed of FSW tool on peak temperature are studied. The results show that peak temperature of the heat source center rises when the rotation speed of FSW tool increases but decreases when the welding speed increases. When rotation speed is 800 r/min and welding speed is 15 mm/min,the peak temperature increases rapidly at first and then reach the steady value of about 1 040 ℃ which appears in the rear side close to heat source. The expansion of temperature in 430 backside area is larger than taht in 304 advancing area,showing a more uniform temperature distribution. The predicted temperature filed based on finite element method shows agreement with the measured value.
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