Abstract
The author has reported the effect of laser welding on the prevention of the fatigue fracture of cracked shafts of a low carbon steel (JIS S 15 CK) in the previous paper. This treatment was found to be very effective for the low carbon steel. In this investigation, the laser welding was applied to specimens of a high carbon steel (JIS SK 3). After specimens were welded at the cracked portion using a CO2 laser, static tensile strength and rotary bending fatigue strength were measured. Since the welded region became extremely hard and brittle by laser welding, both strengths of welded specimens were lower than those of non-welded virgin specimens. However, the strengths become higher than those of virgin specimens after being subjected to tempering. It was found that when tempered at 600°C, the rotary bending fatigue strength of specimens with a crack smaller than 12 mm was higher than that of the base metal, and when tempered at 700°C, the static tensile strength of specimens with a crack smaller than 12 mm was higher than that of the base metal. Therefore, it is concluded that laser welding is effective in preventing the fracture of high carbon steel with fatigue cracks.
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