T-shaped double arc welding backing process for medium-thickness plate

Abstract

The invention discloses a T-shaped double arc welding backing process for a medium-thickness plate. The T-shaped double arc welding backing process comprises the following steps of (1) the blanking ofan H-shaped steel web is performed, negative 3 mm to negative 5 mm remains, a double-sided K-shaped groove is formed in a full penetration weld, which is greater than 16 mm, of the H-shaped steel web, the groove width is 16 mm to 18 mm, no root face is left in the groove, and the clearance of 4 mm to 6 mm is left; (2) oxide skin, iron rust and other impurities existing within a range of 50 mm onboth sides of the K-shaped groove position of the H-shaped steel web and the full penetration weld position at the middle of a flange are cleared through grinding, and a metallic color is displayed; and (3) the clearance of 4 mm to 6 mm is left during the assembly of the full penetration weld, a backing plate of 5 mm is adopted for controlling the clearance at intervals of 500 mm to 600 mm, a tackwelding point is positioned within 10 mm of the backing plate; the tack welding intervals are consistent with the intervals of 500 mm to 600 mm among the backing plates, the length of the tack welding point is 50 mm, and during the assembly, the full penetration weld is shrunk by 3 mm to 5 mm on the section of the H-shaped steel web. According to the T-shaped double arc welding backing process disclosed by the invention, the double-sided groove is formed in the H-shaped steel web, no root face is left, the clearance of 4 mm to 5 mm is left, the double arc backing welding operation is performed, the air gouging operation is not needed, the welding quality and efficiency are greatly improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of steel welding, in particular to a T-shaped double-arc welding priming process for medium and thick plates. Background technique [0002] At present, in domestic steel structure workshops, crane girders, civil building high-rise steel structures and other projects, more and more design H-shaped steel leading welds require full penetration, and require first-level or second-level UT flaw detection to pass. For this type of weld, most domestic steel structure manufacturers adopt the construction technology of reverse gouging and root removal method, which has low work efficiency, high cost and poor construction environment. Our company adopts T-type double-arc welding bottoming technology for medium and thick plates (web thickness ≥ 16mm), through repeated tests and continuous improvement, finally developed a web with double-sided grooves, leaving blunt edges, leaving gaps, and bottoming. It is a new welding process ...

AI Technical Summary

Problems solved by technology

For this type of weld, most domestic steel structure manufacturers adopt the construction technology of reverse gouging and root removal method, which has low work efficiency, high cost and poor construction environment.

Images