【摘要】 设计不同振动焊接参数下平板表面堆焊试验,研究焊接热输入、振动加速度对焊接残余应力的影响,并对焊缝进行TEM观察.结果表明,在较小焊接热输入(22.8kJ/cm)时,残余应力随着振动加速度的增大而减小,且趋势明显;在中等焊接热输入(26.6 kJ/cm)时,残余应力在10 m/s2的振动加速度下残余应力最小;而对于较大焊接热输入(31.6 kJ/cm),残余应力在加速度为15 m/s2时有明显下降.残余最大主应力的方向较接近于平行于焊缝方向.采用15 m/s2振动加速度时,残余横向应力和残余最小主应力在三种热输入下较常规焊接时的应力降低幅度均超过30%,振动降低残余应力的效果明显.对不同条件下焊缝组织的微观结构分析显示,在一定热输入条件下,振动降低了位错密度.更多还原

【Abstract】 Plate butt vibratory welding tests under different conditions were designed to investigate the influence of welding heat input and vibratory acceleration on welding residual stress.The results show that when the welding heat input is 22.8 kJ/cm,residual stress is reduced evidently as the acceleration increases.Residual stress is the lowest when the welding heat input is 26.6 kJ/cm and acceleration is 10 m/s2.While as heat input increases to 31.6 kJ/cm,the residual stress distinctively decreases under the acceleration of 15 m/s2.The direction of residual maximum main stress is proximately parallel to the welded seam.The reduction of transverse stress and minimum main stress at 15 m/s2 compared with that at 0 m/s2 is above 30% under three kinds of heat inputs.The effect of stress relief by vibration is evident.TEM results of the welds shows that density of dislocation is greatly reduced after vibration.更多还原