Pore formation during hybrid laser-tungsten inert gas arc welding of magnesium alloy AZ31B - mechanism and remedy

被引：65

作者：

Liu, LM ^{[1
]}

Song, G ^{[1
]}

Liang, G ^{[1
]}

Wang, JF ^{[1
]}

机构：

[1] Dalian Univ Technol, Dept Mat Engn, State Key Lab Mat Surface Modificat Laser Ion & E, Dalian 16024, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 390卷 / 1-2期

关键词：

magnesium alloy; pore; Laser-TIG welding;

D O I：

10.1016/j.msea.2004.07.067

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

One of the major concerns during high speed welding of magnesium alloys is the presence of porosity in the weld metal that can deteriorate mechanical properties. This study seeks to analyze the presence method and quantity of pore during hybrid laser-tungsten inert gas arc (TIG) welding of magnesium alloy AZ31B by radiography, optical microscopy and electron probe microanalysis (EMPA). At the same time, it identifies both the mechanism of pore formation and a remedy for this problem. The experimental results indicate that lacking of shielding gas for laser beam is the dominant cause of macroporosity formation during the hybrid of laser-TIG welding of magnesium Alloys AZ31B plate, and hydrogen is not main cause to form large pores. A favorable weld without porosity can be obtained by appending lateral shielding gas for laser beam. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：76 / 80

页数：5

共 7 条

[1] Reduction of porosity content generated during Nd:YAG laser welding of A356 and AA5083 aluminium alloys [J].