摘要
文中首先采用高速摄像在线监测系统对激光自熔焊、激光填丝焊熔池动态行为进行分析,并对焊缝成形进行对比分析,进一步采用数值模拟的方法对激光自熔焊、激光填丝焊填充金属作用下的焊接熔池动态行为进行对比分析.研究结果表明,激光自熔焊匙孔壁后方熔池表面附近出现由匙孔开口处向熔池尾部流动的情况,在匙孔开口后方出现了金属隆起,金属的隆起尺寸较大,激光自熔焊焊缝成形较差,表面有凹坑出现.激光填丝焊匙孔壁后方熔池表面出现由匙孔开口处向熔池尾部流动的情况,但在其下方出现由熔池尾部回流向匙孔的流动,虽然也会产生焊接飞溅,但焊接飞溅的尺寸相对较小,而且由于液态金属的填充作用,焊缝表面不易出现下凹的缺陷,焊缝成形良好.与激光自熔焊相比,液态熔滴进入熔池后,匙孔壁后方的熔体流动速度波动程度明显增大.
In this paper,the dynamic behaviors of molten pool in autogenous laser welding and laser welding with filler wire were analyzed by high-speed camera online monitoring system,and the appearance of weld was compared and analyzed.The dynamic behaviors of molten pool under the action of autogenous laser welding and laser welding with filler wire were further analyzed by numerical simulation.The results showed that the surface of the molten pool behind the keyhole wall in autogenous laser welding,the flow from the keyhole opening to the tail of the molten pool occurred,and the metal bulge appeared behind the keyhole opening.The size of the metal bulge was large,and the weld formation in autogenous laser welding was poor,and there were pits on the surface.The surface melt of the molten pool behind the keyhole wall in laser welding with filler wire flowed from the keyhole opening to the tail of the molten pool.But under the surface of the molten pool there was a flow from the tail of the molten pool to the keyhole.Although welding spatter would also occur,the size of welding spatter was relatively small,and due to the filling effect of liquid metal,the weld surface was not easy to appear concave defects,and the weld was well formed.Compared with the autogenous laser welding,the fluctuation of melt flow velocity behind the keyhole wall increased significantly after the liquid droplet entered the molten pool.Highlights:(1)The correlation between the generation of welding spatter and the dynamic fluctuation of keyhole was elucidated using a combination of high-speed camera online monitoring and numerical simulation.(2)The influence of droplet filling on the flow of molten pool and welding spatter during autogenous laser welding and laser welding with filler wire was analyzed.
作者
彭进
许红巧
王星星
李帅
李俐群
龙伟民
陈本乐
PENG Jin;XU Hongqiao;WANG Xingxing;LI Shuai;LI Liqun;LONG Weimin;CHEN Benle(North China University of Water Resources and Electric Power,Material College,Henan International Joint Laboratory of High-efficiency Special Green Welding,Zhengzhou,Henan,450045,China;China Academy of Machinery Ningbo Academy of Intelligent Machine Tool Co.,Ltd.,Ningbo,Zhejiang,315700,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,Heilongjiang,150001,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2023年第11期1-7,I0003,共8页
Transactions of The China Welding Institution
基金
国家自然科学基金面上项目(52071165)
河南省优秀青年基金项目(202300410268)
河南省重点研发与推广专项(科技攻关)项目(222102220082)
河南省高校科技创新人才(22HASTIT026)
河南省高层次人才特殊支持“中原英才计划-中原青年拔尖人才”(ZYBJ202126)
2022年度河南省重点研发与推广专项(科技攻关)项目(232102220052)
河南省高等学校重点科研项目(24A460017)
河南省科技研发联合基金(产业类)
氢用高速无油润滑轴泵及电机关键技术研发及产业化(225101610002)
华北水利水电大学创新创业训练项目(2022XA001)。
关键词
激光焊接
熔池
匙孔
数值模拟
laser welding
molten pool
keyhole
numerical simulation
