NASA NTRS · 19630000067
Vacuum-type backup bar speeds weld repairs
Abstract
A backup bar designed to use both vacuum and air pressure provides a method of sealing the weld root of a faulty section of seam weld. With slight redesign, the bar can be made sufficiently flexible to fit any large cylindrical surface.
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Carmody, R. J.. 1964-08-01. Vacuum-type backup bar speeds weld repairs. https://ntrs.nasa.gov/citations/19630000067
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