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通过一组窄板小型焊接变形试验,证明了残余应力场对焊接构件的动态变形过程,因而也对焊件最终的残余变形有着不可忽视的影响。其机理为:焊接过程中力学熔池的运动干扰了焊件中原有残余应力场的平衡,引起焊件的附加变形。附加变形既改变了焊件高温区的压缩塑性变形,又改变了焊件冷却阶段的变形。
Through a series of small-plate welding deformation tests, the dynamic deformation process of the residual stress field on the welded components is proved, which also has a significant impact on the final residual deformation of the weldment. The mechanism is as follows: the movement of mechanics pool in the welding process interferes with the balance of the original residual stress field in the weldment and causes additional deformation of the weldment. Additional deformation not only changes the compressive plastic deformation in the high temperature region of the weldment, but also changes the deformation during the cooling stage of the weldment.