Electric heating – Metal heating – By arc
Patent
1995-01-19
1996-01-09
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219 74, 219159, 228219, B23K 916
Patent
active
054830397
ABSTRACT:
An arrangement for butt-welding cylindrical sections of large, thin-wall tanks includes a rotatable mandrel with side-by-side sets of radial position adjusters. Each set of adjusters bears on one of the tank sections adjacent the seam, to prevent the sections from sagging out-of-round. The mandrel rotates relative to the welder, so that a continuous seam is formed. A purge chamber is fixed in position behind the seam at the weld head, and is flushed with inert gas. The purge chamber includes a two-sided structure which is contiguous with the cylindrical sections and a circumferential vane to form an open-ended tube-like structure, through which the radial position adjusters pass as the mandrel and cylindrical workpiece sections rotate. The tube-like structure is formed into a chamber by a plurality of movable gates which are controlled to maintain a seal while allowing adjusters to progress through the purge chamber.
REFERENCES:
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patent: 5388753 (1995-02-01), Bjorkman, Jr.
Chin G.
Martin Marietta Corp.
Meise W. H.
Shaw Clifford C.
Young S. A.
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