Laser light irradiation condition setting method, laser welding processing method, and polyamide resin member welded body manufacturing method

摘要

PPROBLEM TO BE SOLVED: To provide a control method of laser beam irradiation and a laser weld processing method, which give good welding strength while securing high air-tightness in a laser welding to weld resin members mutually. PSOLUTION: In mutually welding polyamide resin members by irradiating the laser beam, which uses a member A of 20% or more transmission to the laser beam applied and a member B of 1% or less transmission to the laser beam as the members and performs laser irradiation from the side of member A; the control method of laser beam irradiation condition specifies laser beam irradiation condition as fulfilling the relation in the equation, and the laser weld processing method fulfills the equation: XSP-0.7/SPYXSP-0.7/SP; provided that, is a clearance function between members A and B, wherein, =1.5Z+0.4, X=d/v [sec], Y=4P/(dSP2/SP) [J/sec mmSP2/SP], d is spot diameter [mm] of the laser beam, v is spot scanning speed [mm/s] of the laser beam, P is laser beam output [J/sec] and expresses transmission of laser beam in the member A. Z is the clearance [mm] between members A and B, that ranges 0 to 0.2. PCOPYRIGHT: (C)2009,JPO&INPIT