振动CO2气体保护焊缝残余应力和接头显微组织分析

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (1) : 183-187.

论文

振动CO2气体保护焊缝残余应力和接头显微组织分析

刘洪喜;张方;庞和;丁波

作者信息 +

Residual stress and microscopic structure in welding seam using vibration CO2 arc welding method

LIU Hongxi;ZHANG Fang;PANG He, Ding Bo

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摘要

采用振动CO2气体保护焊对轻型汽车驱动桥壳进行了焊接。对被焊接工件在常规CO2气体保护焊、常规CO2气体保护焊后振动时效处理及不同激振频率下振动CO2气体保护焊三种工艺进行了对比，并就不同条件下的焊缝残余应力、焊接接头显微组织作了分析。结果表明，采用适当振动参数, 在较大振幅时，振动CO2气保焊接能有效减小焊接变形，降低焊接残余应力，最大主动应力降低幅度达到41.74%。熔合区和过度区变窄，焊缝和热影响区晶粒明显细化，由柱状晶转变为等轴晶，魏氏组织减少甚至消失。

Abstract

To improve welding characteristics of CO2 arc welding, sedan split case and sleeve were welded by conventional CO2 arc welding, conventional CO2 arc welding combined with vibration aging and vibration CO2 arc welding processes. The welding seam residual stress and microscopic structure at various welding conditions were also investigated. The experimental results indicated that vibration CO2 arc welding can reduce welding deformation and residual stress in the cases of proper vibration parameters, resonance frequency and higher vibration amplitude. The highest von mises stress decreases by 41.74%. Weld bond zone and transition zone of vibration CO2 arc welding is more narrower compared with the conventional CO2 arc welding. The crystalline grain in welding seam and heat affect zone (HAZ) become smaller. The microscopic structure changes from columnar grain to equiaxed grain，and the widmanstatten structure decrease even disappear increasingly.

导出引用

刘洪喜;张方;庞和;丁波. 振动CO2气体保护焊缝残余应力和接头显微组织分析[J]. 振动与冲击, 2011, 30(1): 183-187

LIU Hongxi;ZHANG Fang;PANG He;Ding Bo. Residual stress and microscopic structure in welding seam using vibration CO2 arc welding method[J]. Journal of Vibration and Shock, 2011, 30(1): 183-187