Apparatus for processing welded joint parts of pipes

Details Apparatus for processing welded joint parts of pipes Apparatus for processing welded joint parts of pipes

1982-12-21

1985-01-01

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

Work-hammering tool

72 53, 72120, B21D 3106

Patent

active

044910010

ABSTRACT:
Tensile residual stress in an annular welded joint part joining the ends of unit pipes is mechanically removed by applying repeated hammering strokes against the inner surface of the pipes over the entire joint part, thereby to cause such part to undergo local plastic deformation. The repeated hammering strokes, which have a peening effect, are applied by several automatically operating hammering devices mounted radially on a rotary head secured to and unitarily moving with a shaft which is driveable in rotation about its axis and in translation in its axial direction.

REFERENCES:
patent: 1079065 (1913-11-01), Pilston
patent: 2575938 (1951-11-01), Brenneke
patent: 3610008 (1971-10-01), Foedisch
patent: 3945098 (1976-03-01), Yascheritsyn et al.
patent: 4232442 (1980-11-01), Brunaud
"Weldments Live Longer with Shot-Peening" by James J. Daly, Welding Design & Fabrication, July 1977, p. 74.

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