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RESEARCH PAPERS

Prevention of Fracture of Cracked Steel Bars Using Laser: Part III—Case of High Carbon Steel

[+] Author and Article Information
Akira Kato

Department of Mechanical Engineering, Chubu University, Kasugai, Aichi 487, Japan

J. Eng. Mater. Technol 110(4), 319-324 (Oct 01, 1988) (6 pages) doi:10.1115/1.3226056 History: Received May 18, 1987; Online October 22, 2009

Abstract

The effect of laser welding on prevention of the fracture of cracked shafts of a high carbon steel are presented. Static tensile strength and rotary bending fatigue strength were obtained using shaft specimens of AISI W1 which were welded by a CO2 laser around a precrack. Since the welded region became extremely hard and brittle, both the strengths of laser-welded specimens were lower than those of non-welded specimens. However, the strengths were increased higher than those of non-welded specimens after tempering the specimens. It was found that when tempered at 600°C after laser welding, the rotary bending fatigue strength of specimens with a crack smaller than 12 mm rose similar to that of the base metal, and when tempered at 700° C, the static tensile strength of specimens with a crack smaller than 12mm rose similar to that of the base metal. Therefore, it was shown that the laser welding is very effective to prevent fracture of high carbon steels.

Copyright © 1988 by ASME
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