摘要
利用钕玻璃激光冲击强化设备对经电火花堆焊修复的SiCp/Cu复合材料裂纹进行了激光冲击强化处理,研究了激光冲击强化处理对电火花堆焊修复裂纹的影响.用X射线应力仪测定了沿垂直焊缝方向表面残余应力的分布状况,用微机控制电子万能试验机测量拉伸性能,用显微硬度计测试了焊缝表面的显微硬度.结果表明,当激光脉冲能量为35 J,激光光斑直径为5 mm时,激光冲击强化处理可以减小或消除焊缝表面残余拉应力,提高经电火花堆焊修复的SiCp/Cu复合材料裂纹试样的抗拉强度,还可以提高堆焊焊缝表面显微硬度.
The crack of SiCp/Cu composite weld restored by electro-spark overlaying was processed by Nd: glass laser,and effects of laser shock processing on the electro-spark overlaying weld crack were analyzed.Surface welding residual stress distribution alone the transverse direction of the weld was investigated by X-ray diffraction techniques,the tensile strength of the weld was investigated by strength test,and the micro-hardness distribution of the weld surface was measured with a micro-hardness tester.The results show that when laser power is 35 J and laser spot diameter is 5 mm,the laser shock processing can reduce the welding residual stresses,which even change from the tensile stress into compressive stress,and improve the tensile strength and the hardness of SiCp/Cu composite weld restored by electro-spark overlaying.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2009年第12期17-20,共4页
Transactions of The China Welding Institution
基金
江苏省高技术研究计划资助项目(BG2007033)
国家自然科学基金资助项目(50675089)
关键词
激光冲击
电火花堆焊
残余应力
laser shock processing
electro-spark overlaying
residual stress
