Effects of welding current on properties of A-TIG welded AZ31 magnesium alloy joints with TiO2 coating

被引：14

作者：

Shen, Jun ^{[1
]}

Zhai, Da-jun ^{[1
]}

Liu, Kai ^{[1
]}

Cao, Zhong-ming ^{[1
]}

机构：

[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2014年 / 24卷 / 08期

基金：

中国国家自然科学基金;

关键词：

AZ31 magnesium alloy; A-TIG welding; welding current; TiO2; coating; MECHANICAL-PROPERTIES; MICROSTRUCTURES; FLUXES; PENETRATION;

D O I：

10.1016/S1003-6326(14)63377-X

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effects of welding current on the macro-morphology, microstructure and mechanical properties of tungsten inert gas (TIG) welded AZ31 magnesium alloy joints with TiO2 coating were investigated. The results showed that the increase of welding current led to the increase in the depth/width ratio and deteriorated the surface appearance of the welded seams with TiO2 coating. The grain size of alpha-Mg and the amount of granular beta-Mg17Al12 particles in the welded seams also increased. The welded joints with TiO2 coating exhibited a deeper weld penetration and larger grain size compared with the welded joint without TiO2 coating. When the welding current was less than 130 A, the ultimate tensile strength of the welded joints with TiO2 coating increased with the increase in welding current and then decreased when the welding current was greater than 130 A. The average microhardness of the heat-affected zone and fusion zone decreased gradually with the increase of welding current.

引用

页码：2507 / 2515

页数：9

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