| 摘要 |
PURPOSE:To decrease the stress concentration at the point where a crack begins and to extend a fatigue life by using a non-weldable backing strip to form a rack part by fillet welding to the 1st member, pressing the 2nd member to the rack part to form a space part and welding the space part. CONSTITUTION:A non-weldable backing strip, for example, a copper back 12, is pressed to the position on the side face 10a of the 1st member 10 to which the 2nd member is to be welded. The corner part between the back 12 and the 1st member 10 is fillet welded to form a rack part 13. The back 12 is removed by hammering from the 1st member 10, and the rack part 13 corresponding to a conventional back plate is allowed to remain in the 1st member 10. The 2nd member 11 is pressed to the contact surface 13a in the part 13 and the space part 14 enclosed by the side face 10a of the member 10, the part 13 and the end face 11a of the 2nd member 11 is welded to form a weld zone 15. |
