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

B - Operations, Transporting

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B23P 9/00 (2006.01) B23P 9/04 (2006.01) B23P 25/00 (2006.01) B23Q 3/00 (2006.01) B24B 39/02 (2006.01) C21D 7/04 (2006.01)

Patent

CA 1196773

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 this part to undergo locally plastic deformation. The repeated hammering strokes, which have a peening effect, are applied by several automatical- ly 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.

418068

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