MANUFACTURE OF EXTREME THIN WALL WELDED TUBE

摘要

PURPOSE:To obtain an extreme thin wall welded tube of high quality weld parts by tack welding the butted parts only by means of high concentration weld heating and welding after that. CONSTITUTION:Edge parts of an extreme thin wall plate 10 are butted cylindricallly by means of appropriate bending means. A tack welding is performed by a continuous tack welding means 14 along a butted part 12 without deformation such as lapping and waving due to heating the butted part 12 and at the very narrow width. After that, the main welding is carried out by the main welding 16 to the weld direction. Therefore, the safety welding can be performed by easy control of entered heat to the weld part 12 and broadening the the width of weld conditions.