| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the deterioration in the strength of welding segments occurring in air bubble and cracks and to reduce the amount of splashing of metals which occurs in cooling weld metal and the residual stress of the welding segments to a smaller level. SOLUTION: In subjecting the areas to be joined of the adjacently arranged metals to laser welding by irradiating the areas with a laser beam, not the power of the laser beam is kept constant from the start of the irradiation till the end of the irradiation but the irradiation of the laser beam is ended after the power of the laser beam is made lower than that at the start of the irradiation, by which the rapid solidification on cooling of the weld metal can be suppressed. As a result, the occurrence of the cracks and air bubbles in the welding segments can be decreased. Also, the amount of splashing of the metals which occurs in cooling the weld metal and the residual stress of the welding segments can be suppressed to the smaller level.</p> |
