Abstract
The author reported the effect of laser hardening on the prevention of the fatigue fracture of cracked shafts of low carbon steel, in a previous paper. This treatment was found to be effective for comparatively small cracks. However, cracks remain open after laser hardening. In this investigation, the specimens were welded at the cracked portion using a CO2 laser. The welding depth was 2.3mm, so small cracks were erased completely, but the deeper parts of large cracks were not welded. Rotary bending fatigue and tensile strengths of specimens with fairly large cracks (up to l=13 mm for rotary bending and 14 mm for tension) were found to be raised to those of virgin specimens by laser welding. And it was shown that laser welding is much more effective than laser hardening to prevent fracture.
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