Degradation mechanism of electrode tip during resistance spot welding of aluminium alloy sheets

被引：6

作者：

Kondo, M. ^{[1
]}

Nagata, H. ^{[1
]}

Nishimura, A. ^{[1
]}

Kokawa, H. ^{[2
]}

机构：

[1] Toyota Motor Co Ltd, Body Assembly Engn Div, Toyota 4718573, Japan

[2] Tohoku Univ, Grad Sch Engn, Dept Mat Proc, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2011年 / 16卷 / 02期

关键词：

Resistance spot welding; Aluminium alloy sheet; Electrode tip; Electrode life; Electrode degradation mechanism; FINITE-ELEMENT-ANALYSIS; SIMULATION;

D O I：

10.1179/136217111X12972560551725

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigated the electrode life and the electrode degradation characteristics during continuous resistance spot welding of aluminium alloy sheets. When a long welding time and dome radius type electrode were used, the electrode life was extended more than that when a short welding time and radius type electrode are used. The electrode tip is considered to degrade by the following mechanism: an Al-Cu alloy layer is formed at the electrode tip during continuous welding, and then it peels off from the electrode tip transferring to the surface of aluminium alloy sheet. Its peeling makes the electrode tip indented and finally the electrode tip flattens with increasing diameter of electrode tip. In order to eliminate the direct contact between electrode and worksheet, a special Cu foil insert device for resistance spot welding of aluminium alloy sheets was developed and an extremely long electrode life was achieved.

引用

页码：126 / 132

页数：7

共 28 条

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