随焊冲击旋转挤压控制LD1O薄板件焊接变形和热裂纹的研究

摘要

LD10铝合金薄板在焊接过程中易产生焊接热裂纹,焊后薄板件易产生较大的焊接变形.采用冲击旋转挤压头对焊缝及相邻区域施加一定频率的冲击旋转挤压作用,使焊缝及近缝区产生塑性延展；对LD10常规焊接件和随焊冲击旋转挤压件的焊接残余变形与焊接残余应力进行测量,对比分析了常规焊接件和随焊冲击旋转挤压件的拉伸试验、维氏硬度、断口分析和金相组织,明确了随焊冲击旋转挤压工艺对焊接件组织及性能的影响.试验结果表明,随焊冲击旋转挤压处理后,工件的残余应力被降低到较低水平,随焊冲击旋转挤压工艺起到控制焊接残余应力和变形的作用,并且抑制了焊接热裂纹的产生.%Large welding residual deformation and hot cracks can be easily found during LD10 thin plate welding.The motion,welding with impacting rotation compression,was utilized to generate a force.The force acted on the weld bead and near weld zone to produce plastic extension.In order to know the effects of the welding with impact rotation compression on the microstructure and mechanical properties of the weldment,welding residual stress and deformation,metallographic observation,SEM of fracture,tensile experiment and hardness measurement of the weld joint were utilized.The experimental results show that the residual stress and deformation,hot crack can be reduced by the technology of welding with impacting rotation compression.