| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and apparatus for manufacturing an exhaust pipe for an engine which are capable of decreasing a temperature difference between a seam-welded outer surface and a seam-welded inner surface at the time of seam welding.SOLUTION: An exhaust pipe manufacturing apparatus 70 comprises an outer circumferential electrode wheel 71 abutted on an outer circumference of a mounting ring 41, a pressing means 102 pressing the outer circumferential electrode wheel 71 to the mounting ring, an inner circumferential electrode wheel 103 abutted on an inner circumference of a pipe 40 making up an exhaust pipe, a transformer 104 serving as a voltage supply means for supplying a predetermined voltage to the outer and inner circumferential electrode wheels 71 and 103, and a controller 105 for control of the voltage of the transformer 104. The plate thickness T1 of the outer circumferential electrode wheel 71 is formed larger than the plate thickness T2 of the inner circumferential electrode wheel 103. |
