Device for supporting weld underbead

Details Device for supporting weld underbead Device for supporting weld underbead

1983-04-25

1984-08-14

Watson, Robert C.

Metal fusion bonding

Seam backup means

269 481, 2541344, B23K 522

Patent

active

044652208

ABSTRACT:
An elastomeric mandrel has a shallow groove around the outer diameter. A woven sleeve of ceramic fiber surrounds the mandrel; which in turn is covered with a woven sleeve of fiberglass. The mandrel with coverings is inserted into tubing to be joined by welding with the shallow groove positioned under the joint. The mandrel is diametrically expanded by means located outside of the tubing to press the coverings against the inside of the tubing during time of welding, and the height of the weld underbead is controlled by the groove in the mandrel acting as a mold.

REFERENCES:
patent: 2281918 (1942-05-01), Constant et al.
patent: 2792626 (1957-05-01), Chyle
patent: 2794197 (1957-06-01), Crane
patent: 3960311 (1976-06-01), Griffiths
patent: 4084739 (1978-04-01), Koltz et al.
patent: 4103816 (1978-08-01), Scholtus et al.
patent: 4150775 (1979-04-01), Roden et al.

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