激光-电弧复合焊接镁合金过程中匙孔行为与气孔形成的关系  

Relationship Between Molten Pool Behavior and Keyhole-Induced Porosity in Pulsed Laser-arc Hybrid Welding of Magnesium Alloy

作　　者：辛立军[1] 林三宝[3] 刘旭平 朴志刚 伍复发[2] 陈明华[2] Xin Lijun;Lin Sanbao;Liu Xuping;Piao Zhigang;Wu Fufa;Chen Minghua(Liaoning University of Technology,Jinzhou 121001,China;State Key Laboratory of Advanced Welding and Jointing,Harbin Institute of Technology,Harbin 150001,China;Petro China Jinzhou Petrochemical Company,Jinzhou 121001,China;School of Material Science and Technology,Liaoning University of Technology,Jinzhou 121001,China)

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121001 [2]辽宁工业大学,辽宁锦州121001 [3]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨151001 [4]中国石油天然气股份有限公司锦州石化分公司,辽宁锦州121001

出　　处：《稀有金属材料与工程》2020年第6期1894-1900,共7页Rare Metal Materials and Engineering

基　　金：Opening Program of State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology;National Natural Science Foundation of China(51571006,51805236);Natural Science Foundations of Liaoning Province(JQL201715402,20180510.40);Program for Liaoning Distinguished Professor。

摘　　要：在激光-电弧复合深熔焊接接头中,气孔是一种对焊接质量影响极大的焊接缺陷。本工作通过实验研究了激光-电弧复合焊接镁合金板过程中匙孔行为与气孔形成的关系。详细研究了激光脉冲对熔池的冲击作用,激光匙孔的动态行为以及焊接接头中的气孔形成规律。结果表明:激光脉冲对熔池的冲击作用有利于抑制气孔的形成,冲击作用的大小取决于给定的激光脉冲参数。激光匙孔的状态决定焊接熔池的行为,匙孔的几何尺寸和开/闭行为直接影响气孔的形成。较高的激光脉冲峰值功率会导致焊后气孔的出现。延长匙孔开口的闭合时间,可以给匙孔中的气体足够的时间逃逸,进而可以抑制残留性气孔的生成。The porosity is an important kind of weld defects in deep-penetration laser-arc welds.This work gives an experimental study on relationship between molten pool behavior and keyhole-induced porosity in pulsed laser-arc hybrid welding.In this research,the impact effect of laser pulse on the weld pool,and live behavior of the laser keyhole and the porosities in the weld were investigated.Results show that the impact effects from the laser pulse depend on the laser pulse parameters and stronger impact effect helps restrain the porosity formation.The laser keyhole state dominants the welding pool behavior.The keyhole dimension and open-close state directly influences the porosity formation.Extremely high laser pulse power always brings about porosities after welding.Lengthening the laser keyhole opening time and giving the gas enough time to escape will be an effective way to restrain the porosity.

关 键 词：镁合金 熔池 激光-电弧复合焊接 气孔 激光匙孔 

分 类 号：TG441.7[金属学及工艺—焊接]