Method and apparatus for manufacturing for fixing a mounting ring to an exhaust pipe assembly
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United States of America Patent
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Dec 17, 2013
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N/A
app pub date -
Mar 10, 2010
filing date -
Jun 30, 2009
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Abstract
A method and apparatus for manufacturing an exhaust pipe assembly which are capable of decreasing a temperature difference between a seam-welded outer and inner surface at the time of seam welding. The apparatus comprises an outer circumferential electrode wheel abutted on an outer circumference of a mounting ring, a pressing means pressing the outer circumferential electrode wheel to the mounting ring, an inner circumferential electrode wheel abutted on an inner circumference of a pipe making up an exhaust pipe assembly, a transformer serving as a voltage supply means for supplying a predetermined voltage to the outer and inner circumferential electrode wheels and, and a controller for controlling voltage of the transformer. Thickness T1 of the outer circumferential electrode wheel is larger than thickness T2 of the inner circumferential electrode wheel.
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