Electric heating – Metal heating – Of cylinders
Patent
1994-10-27
1996-07-23
Shaw, Clifford C.
Electric heating
Metal heating
Of cylinders
219 7614, 21912511, B23K 904
Patent
active
055391770
ABSTRACT:
In a method for overlap welding the inner surface of an elbow pipe, the elbow pipe is first divided axially into several pieces. These pieces are then stacked such that the inner arc of any piece is continuous with the outer arc of neighboring piece(s) to form an elbow piece stack. The inner surface of this stack may then be automatically overlap welded to a high uniformity of thickness using a relatively simple welding method. By fixing a short straight end tube to each end of the elbow piece stack it becomes possible using a relatively simple welding method to automatically overlap weld the entire surface area of the inner surface of the elbow piece stack continuously and to a high uniformity of thickness thus further improving productivity and quality of finish. The welded stack of elbow pieces is then dismantled and the elbow pipe is reassembled from the separate pieces.
REFERENCES:
patent: 3156968 (1964-11-01), White, Jr.
patent: 3568029 (1971-03-01), Bollinger
patent: 4165245 (1979-08-01), Ludwig
patent: 4253006 (1981-02-01), Ludwig
patent: 4514443 (1985-04-01), Kostecki
patent: 4577795 (1986-03-01), Forner et al.
patent: 5205469 (1993-04-01), Capitanescu
Hase Yukio
Kageyama Fujio
Kushida Yoshiteru
Okuya Masaru
Yamada Tetsuo
Kabushiki Kaisha Kobe Seiko Sho
Shaw Clifford C.
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