原子能科学技术2018，Vol.52Issue(2)：210-214,5.DOI:10.7538/yzk.2017.youxian.0257
316不锈钢激光焊接中离焦量对热裂纹的影响
Effect of Defocusing Amount on Hot Cracking in Laser Welding of 316 Stainless Steel
张国栋 1郑剑平 1赵俊 1张征 1王振东 1梁娜1
作者信息
- 1. 中国原子能科学研究院 反应堆工程技术研究部,北京 102413
- 折叠
摘要
Abstract
316 stainless steel welding experiments were carried out with a low power pulsed laser welding machine.Based on the surface morphology,microstructure,micro-hardness and energy dispersive spectrum(EDS),the effect of defocusing amount on the weld structure and hot cracking was analyzed.The results show that with the increase of defocusing amount,the weld microstructure is gradually refined and compact,and the tendency of hot cracking decreases gradually.With the increase of defocusing amount,the weld penetration and weld width reduce,but the width to depth ratio increases.When the width to depth ratio is greater than 7.5,the welding hot cracking completely disappears.Adjusting the defocusing amount changes the distribution of laser energy,which leads to the segregation of S,P and other elements to the surface during solidification.So the defocusing amount can effectively control the welding hot cracking of 316 stainless steel.关键词
热裂纹/离焦量/激光焊接/不锈钢Key words
hot cracking/defocusing amount/laser welding/stainless steel分类
矿业与冶金引用本文复制引用
张国栋,郑剑平,赵俊,张征,王振东,梁娜..316不锈钢激光焊接中离焦量对热裂纹的影响[J].原子能科学技术,2018,52(2):210-214,5.
