Novel technique for laser lap welding of zinc coated sheet steels

被引：52

作者：

Li, X. ^{[1
]}

Lawson, S. ^{[1
]}

Zhou, Y. ^{[1
]}

Goodwin, F. ^{[2
]}

机构：

[1] Univ Waterloo, Ctr Adv Mat Joining, Waterloo, ON N2L 3G1, Canada

[2] Int Lead & Zinc Res Org Inc, Res Triangle Pk, NC 27713 USA

来源：

JOURNAL OF LASER APPLICATIONS | 2007年 / 19卷 / 04期

关键词：

laser lap welding; Zn-coated steel; weld porosity; aluminum layer; vapor suppression;

D O I：

10.2351/1.2795755

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

When zinc coated steels are laser welded, zinc adjacent to the weld bead is vaporized and will cause serious weld pool disruption in lap welding unless special measures are applied such as provision of a joint gap for vapor venting. A novel alternative technique has been developed to stabilize laser lap welding: this involves addition of a small amount of aluminum to the faying surface region, so that a liquid Al-Zn alloy of high boiling point is formed, thus lowering the Zn vapor pressure. Lap welds have been made with good process stability using Nd: yttrium-aluminum-garnet and direct diode lasers, and with added Al in the form of inserted foil or previously applied cold sprayed coatings. The development is described in U.S. Patent Application No. 11/226,834. Process optimization is currently under way to define optimum aluminum addition rates that will reliably suppress defects while minimizing Al uptake into the steel weld pool. (c) 2007 Laser Institute of America.

引用

页码：259 / 264

页数：6