QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
Print ISSN : 0288-4771
Heat Treatment of Welds Using Pulsed YAG Laser
Study on the Micro Repair Welding by Pulsed YAG Laser (Report 2)
Takehiko WATANABEZenji YAMADATakeo TAMURA
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2001 Volume 19 Issue 3 Pages 433-439

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Abstract

This study describes laser heat treatment of alloy tool steels SKD11 using pulsed YAG laser. When filler metal SUJ2 is welded to base metal SKD11 which metal is material of rotary cutter, the hardness of weld metal become lower than that of the base metal.
In order to improve the hardness of weld metal which become lower than that of the base metal after laser welding, heat treatments using an electric furnace and pulsed YAG laser were carried out after laser welding, then examined the variation of hardness of weld metal after heat treatments. The obtained results are as follows.
In the heat treatment using an electric furnace, the hardness of weld metal which become low against the base metal after laser welding become higher than that of the base metal under the conditions of heat treatment holding temperature at 180°C and holding time from 30 s to 120 s, then take out the weld metal from the electric furnace and cooling from furnace temperature to room temperature.
In the heat treatment using pulsed YAG laser, after laser welding in succession laser beam radiate at the surface of weld metal, the hardness of weld metal which become low against the base metal after laser welding become the same hardness as the base metal under the conditions of holding temperature at 180°C and holding time from 30 s to 120 s, then cooling to room temperature.

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