Apparatus for processing welded joint parts of pipes
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United States of America Patent
Stats
-
Jan 1, 1985
Grant Date -
N/A
app pub date -
Dec 21, 1982
filing date -
Dec 21, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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