This paper investigates the effect of laser welding on the prevention of fracture of cracked steel specimens. Precracks occurred in shaft specimens of SAE 1015 were welded by a CO2 laser, and then the rotary bending fatigue and static tensile tests were executed. Both strengths of fatigue and tensile of specimens having a diameter 11mm with a fairly large precrack 13mm long could be raised up to that of virgin specimens. It was shown that laser welding is very effective for the fracture prevention of cracked steel shafts.

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