| 摘要 |
<p>The present invention relates to a laser welding method and, more specifically, to a method of butt-laser-welding a stainless steel material before manufacturing a welding tube used for an injection needle or the like, and a laser welding member using the same. In a laser welding method of welding by irradiating a joint portion of stainless steel with a laser, welding is started at a welding heat input of P1 at the time of the laser welding, the welding is finished at a welding heat input of P2, and the P1 and P2 satisfy Equation 1 as follows: [Equation 1] 0.7<= (P2/P1) <= 0.8 where P1 denotes a welding heat input at a welding start time point, and P2 denotes a welding heat input at a welding end time point.</p> |
