Residual stress improving apparatus for piping technical field

Details Residual stress improving apparatus for piping technical field Residual stress improving apparatus for piping technical field

2005-07-28

2009-02-03

Evans, Geoffrey S (Department: 3742)

Electric heating

Metal heating

By arc

C219S121740

Reexamination Certificate

active

07485828

ABSTRACT:
A residual stress improving apparatus for piping, which can heat an outer peripheral surface of piping to reduce (including eliminate) the residual stress of the piping is provided. The apparatus has a laser head portion, and circumferential direction moving mechanism composed of a ring rail and a rotational travel bogie. Further, the apparatus may adjust the reflection direction of laser light so that the laser light reflected by the outer peripheral surface of the piping does not return to the laser head, and adjust the delivery direction of the laser light so that the outer peripheral surface of the bending pipe portion located forwardly, in the pipe axis direction, of the laser head is irradiated with the laser light.

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International Search Report mailed Oct. 25, 2005 of International Application PCT/JP2005/013802.

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