METHOD OF WELDING LARGE-SIZED METALLIC SHELLS Russian patent published in 2013 - IPC B23K31/02 B23K101/12 B23K9/18 B23K37/53 B23K37/06 

FIELD: process engineering.

SUBSTANCE: invention relates to oil and oil-refining industries and may be used in development of oil processing equipment, particularly, in assembly of large-sized metallic tanks, say, separators, settlers, oil storage tanks, etc. Proposed method comprises butt hidden-arc welding of metal sheets with forced feed of flux from above and below of weld seam. Then cylinders are rolled from welded sheets. Then butt is welded long the cylinders with forced feed of melt from above and below of weld seam to produce cylindrical shell. Cylindrical shells are arranged at rolls to make their end surfaces face each other. Butt hidden-arc welding of cylindrical shells is carried out with forced feed of flux from above and below of weld seam. Note here that arc zone is filled with the melt between the shells by feeding the melt from inside of shells. In welding the shells are rotated.

EFFECT: higher strength and quality of weld seam.

2 dwg, 1 ex