从力学角度出发，首次提出随焊锤击的焊接技术，并结合跨焊缝两侧横向位移的测量及显微组织的研究，分析了随焊锤击防止焊接热裂纹的作用机理．试验结果表明，随焊锤击技术可显著地改善焊缝显微组织及残余应力分布，防止焊接热裂纹的产生，并能够有效地控制LY12CZ铝合金薄板焊接横向及纵向收缩变形．可以认为随焊锤击是一种更合理、更具实用价值的低应力小变形无热裂的焊接技术新方法．
From the mechanical viewpoint of preventing welding hot cracking, a new welding technology -trailing peening was applied for the first time in the study. The mechanism of trailing peening on welding hotcracking susceptibility was investigated in combination with the measurement of transverse displacement acrossthe weld and examination of microstructure. The experimental results show that welding with trailing peeningnot only can improve the microstructure of welds and distribution of residual stress obviously, but also preventwelding hot cracking and control longitudinal or transverse shrinkage effectively. So, trailing peening can beregarded as an effective and feasible method for controlling welding stress and distortion and preventing hotcracking of the joints.
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