Method of outside welding of pipelines

Details Method of outside welding of pipelines Method of outside welding of pipelines

1978-05-08

1981-03-10

Goldberg, E. A.

Electric heating

Metal heating

Of cylinders

219 591, 219137R, 228166, 228168, 228169, B23K 3106

Patent

active

042556414

ABSTRACT:
The specification discloses a method and apparatus for assuring the integrity of outside weldings of pipelines. Pipe sections are prepared for welding by forming a beveled profile with a relatively narrow annular contact band on the ends of each pipe section. When the pipe sections are abutted end to end for welding, the leveled profiles form a relatively deep groove on the outside of the pipe between the pipe sections, with the annular contact bands abutting and spaced inwardly from the grooves. The contact band on at least one of the pipe sections is circumferentially prepared such as by knurling to provide controlled spacing between the contact bands of the pipe sections. A welding arc is applied to the bottom of the groove from the exterior of the pipe sections to weld the annular contact bands together. Welding penetration is enhanced by the circumferential preparation of the contact bands.

REFERENCES:
patent: 1665851 (1928-04-01), Harris
patent: 2662277 (1953-12-01), Stone
patent: 3047942 (1962-08-01), Schneider
patent: 3209122 (1965-09-01), Johnston
patent: 3922517 (1975-11-01), Nezson
Welding Handbook "Welding Processes", Sixth Edition Section Two Aws., N.Y. 1969, pp. 11-15, Appendix.

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