The Effects of Weld Geometry on Weld Quality and Fatigue Properties of Galvanized HSLA Laser Seam Weldments
by
Ming Ke
Department of Materials Science and Engineering
and
Frederick V. Lawrence, Jr.
Department of Civil Engineering
Department of Materials Science and Engineering
Abstract
INTRODUCTION
Laser welding possesses the advantages of high power capability, welding speed, welding precision, flexibility. Laser welding results in higher productivity, efficient use of energy and is adaptable to automated welding of large and complex structures. Very narrow, accurate, low distortion, low contamination welds can be obtained by laser welding; and no electrode or filler materials are generally required[1,2]. In many instances, laser welds exhibit better mechanical properties than do welds made by conventional arc welding[3].
Thinner gauges of galvanized HSLA sheet steel have replaced thicker, heavier sections of mild steel in automotive applications due to the need to reduce automobile weight for increasing fuel efficiency. However, there are some difficulties in laser welding galvanized HSLA steel since the zinc coating vaporizes during welding and results in a poor weld quality and fatigue resistance. In addition, the weld geometry is an important factor which affects the fatigue properties of laser welds[4]. Thus, the current study investigated the effects of weld geometry and welding conditions on the weld quality and the fatigue life of laser welds.
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