METHOD FOR METALLURGICALLY ATTACHING TOGETHER TWO TUBES

摘要

A method for metallurgically attaching together two tubes (12, 24). A first tube (12) having a far wall portion (14) with a first through hole (16) and a near wall portion (18) with a second through hole (20) is obtained. A second tube (24) including first and second outward folds (28, 36) is obtained. The tubes (12, 24) are positioned with the first fold (28) passed through the second through hole (20) and contacting the far wall portion (14) surrounding the first through hole (16) and with the second fold (36) located outside the near wall portion (18). A first resistance welding current path is created proximate the first fold (28) and the far wall portion (14) and the first fold (28) is relatively moved deformingly against the far wall portion (14) creating a first weld zone (46). A second resistance welding current path is created proximate the second fold (36) and the near wall portion (18), and the second fold (36) is relatively moved deformingly against the near wall portion (18) creating a second weld zone (50).