Apparatus and method for forming end surfaces on annular work pi

Details Apparatus and method for forming end surfaces on annular work pi Apparatus and method for forming end surfaces on annular work pi

1975-08-11

1976-10-26

Hinson, Harrison L.

Metal working

Plural diverse manufacturing apparatus including means for...

Binding or covering and cutting

29200P, 82 1C, B23P 2304, B23P 1900, B23B 300

Patent

active

039875237

ABSTRACT:
An annular work piece, such as a large pipe, is prepared for welding end-to-end to a similar piece, by a combination of cutting or machining and swaging or cold-rolling, to form bevel, land, and an annular fin-like projection which will better control penetration. In its apparatus aspects, an internal clamp mechanism is used to hold the pipe against rotation while also keeping it essentially circular in outline, a series of cutting tools, preferably complementing each other, is driven around the pipe and end for exterior and interior bevel surfaces with a more or less plane land surface between them. Rollers which serve to constrain and guide the cutting tools are thereafter employed to swage or cold-work the interior of the pipe end to form a small sharp-edged annular projection which serves as a heat sink to control and limit penetration of molten metal from an external electric arc into the interior of the joint. A supplementary back-up or chill may be used for further control, if needed.

REFERENCES:
patent: 2102259 (1937-12-01), Edwards et al.
patent: 3103140 (1963-09-01), Connelley
patent: 3461264 (1969-08-01), Nelson et al.
patent: 3608406 (1971-09-01), Paysinger et al.
patent: 3733939 (1973-05-01), Paysinger et al.

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