| 摘要 |
<p>[OBJECT] To provide a method for producing a resin joined body, which method can solve, without controlling laser irradiation conditions (e.g., laser output and the movement speed of a laser head), problems involved in a resin joined body production method wherein a first resin member and a second resin member which are stacked with each other are welded together by carrying out laser welding along a line on a welding portion; i.e., problems in terms of impairment of bonding strength and sealing performance, which arise due to the fact that the end point of laser welding falls beyond the start point thereof, and the resultant resin joined body has a weld overlap portion (i.e., a welded portion between these two points, which has been subjected to a laser irradiation process one more time than has another welded portion). [MEANS FOR SOLUTION] A specific region L1 of a welding portion of a second resin member 21 is provided to form a low-laser-light-transmissible portion, the low-laser-light-transmissible portion having laser light transmissibility lower than that of a region of the welding portion other than the specific region L1; and welding is carried out so that a portion between points S2 and F2, serving as a weld overlap portion 112, is present in the specific region L1 forming the low-laser-light-transmissible portion.</p> |
