Laser Beam Welding of Automobile Materials for Lightweight Car Body

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This paper presents laser beam welding (LBW) of an age-hardened aluminum alloy and a bake-hardening (BH) steel, which are promising materials for lightweight car body, compared with conventional arc welding. The LBW of the aluminum alloy had a significantly narrower fusion zone and heat affected zone (HAZ) than the arc weld and the hardness of the softened zones was almost completely recovered to the base metal hardness after a post weld aging treatment. This advantage of LBW is due to a low overall heat input resulting from its high energy density. This is also beneficial for welding of the BH steel. In the LBW of the pre-strained BH steel, both the fusion zone and HAZ were bake-hardened after a heat-treatment and the fracture occurred in the base metal in the tensile test. In contrast to this, the arc weld had a large softened zone in the HAZ and fractures in this region.

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Periodical:

Edited by:

Masaaki Naka and Toshimi Yamane

Pages:

487-492

DOI:

10.4028/www.scientific.net/MSF.502.487

Citation:

A. Hirose and K. F. Kobayashi, "Laser Beam Welding of Automobile Materials for Lightweight Car Body ", Materials Science Forum, Vol. 502, pp. 487-492, 2005

Online since:

December 2005

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$35.00

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