THE INFLUENCE OF OXYGEN ADDITIONS ON ARGON-SHIELDED GAS METAL ARC-WELDING PROCESSES

被引：0

作者：

JONSSON, PG ^{[1
]}

MURPHY, AB ^{[1
]}

SZEKELY, J ^{[1
]}

机构：

[1] MIT, DEPT MAT SCI & ENGN, CAMBRIDGE, MA 02139 USA

来源：

WELDING JOURNAL | 1995年 / 74卷 / 02期

关键词：

OXYGEN ADDITIONS; ARGON SHIELDING GAS; GMAW; ARC CHARACTERISTICS; GAS PROPERTIES; ARC COLUMN; THEORETICAL MODEL; COMPUTATIONAL MODEL; OXIDE FORMATION; SURFACE TENSION;

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

It has been observed experimentally that small additions of oxygen to the argon shielding gas affect the general operation of GMAW processes. By theoretically modeling the arc column, it is shown that the addition of 2 to 5% oxygen to argon has an insignificant effect on the arc characteristics. This corresponds to the minor changes in the thermophysical transport and thermodynamic properties caused by the oxygen addition. Therefore, it is concluded that the addition of oxygen to the argon shielding gas mainly affects the anode and the cathode regions. From the literature, it was found that the formation of oxides initiates arcing at the cathode and decreases the movement of the cathode spots. These oxides can also improve the wetting conditions at the workpiece and the electrode. Finally, oxygen is found to affect the surface tension gradient and thereby the convective flow of liquid metal in the weld pool.

引用

页码：S48 / S58

页数：11

共 81 条

[1] POWER DISSIPATION IN THE COLUMN OF A TIG WELDING ARC [J].