| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a laser beam welding method which melts a member to be welded effectively and which welds it with a pulse laser beam without inviting the generation of cracks caused on the rapid cooling. SOLUTION: In a laser beam welding method to weld a member to be welded with a pulse laser beam, the time t1 that the output of the laser beam is reached until the peak value P is made as (t1 <=0.8ms), the time t2 that the output is reduced until 1/2 of the peak value P is made as (t2 <=1.0ms), the output after passing the time t2 is reduced gradually, and the pulse laser beam of the wave shape that the pulse width T is set as (T>=2.0ms) is used.</p> |
