| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an upset welding method for a wheel rim capable of suitably joining both end faces of high tensile strength steel plates being a wheel rim material. <P>SOLUTION: The upset welding method for a wheel rim includes: a preheating step S1 of deforming so as to increase an area of the end face by softening the butted end faces by conducting first current I1 between the butted end faces while pressurizing both butted end faces with first pressurizing force P1; a cool-down step S2 of making heat balance of both butted end faces uniform on the basis of heat transmission while the current conduction is stopped and the pressurizing force is reduced to second pressurizing force P2; a heating step S3 of softening the butted end faces by flowing second current I2 smaller than the first current while the pressurizing force is increased to third pressurizing force P3; and an upsetting step S4 of welding both end faces through upset-deforming by making the pressurizing force increase to fourth pressurizing force P4 while reducing an amount of conducted current. <P>COPYRIGHT: (C)2013,JPO&INPIT |
