Assembly method for fillet welded joint at vertical positions of thin plates

Abstract

The invention discloses an assembly method for a fillet welded joint at the vertical positions of thin plates, and belongs to the technical field of metal welding. According to the assembly method forthe fillet welded joint at the vertical positions of the thin plates, the two to-be-welded thin plates are firstly fixed; and the to-be welded positions are welded by adopting a vertical downward locating welding process. The vertical downward locating welding process is adopted, the locating welding length and the locating welding distance are shortened, the vertical downward locating welding length ranges from 15 mm to 20 mm, and the locating welding distance of two adjacent positions ranges from 100 mm to 150 mm; meanwhile, due to the adoption of vertical downward locating welding, the size of a weld leg of locating welding can be effectively controlled to be smaller than or equal to 3 mm, and it is guaranteed that the convexity degree of the welded joint of locating welding is in an inward concave type; the situation that during welding covering and locating welding of the normal filler welded joint, the normal filler welded joint is formed and is too convex at the locating welding position is avoided, welded joint forming of the normal filler welded joint at the locating welding position is improved, and the grinding quantity is effectively reduced; and meanwhile, the weldingspeed and welding efficiency are high, and thin plate deformation caused by locating welding can be reduced.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a method for assembling thin plate vertical fillet welds. Background technique [0002] The existing vertical position fillet welds of thin plates are basically assembled and fixed by vertical upward tack welding. The length of a single tack weld for a fixed weld assembled by this process is 30-50mm, and the distance between two adjacent tack welds is 200-300mm. Due to the excessively large tack welding spacing, during the official fillet weld welding process, the assembled and fixed thin plate will be deformed at the position where there is no tack welding, resulting in a larger assembly gap and affecting the welding quality. And the surface shape of the vertical tack welding seam belongs to the convex tack welding, the tack welding leg size is ≥ 5mm, and the post-weld ≥ 5mm, the formal vertical position fillet weld design theoretical leg size is generally ≤ 5mm, and the t...

AI Technical Summary

Problems solved by technology

Due to the too large pitch of tack welding, during the welding process of the formal fillet weld, the assembled and fixed thin plate will be deformed at the position without tack welding, resulting in a larger assembly gap and affecting the welding quality

And the surface shape of the vertical tack welding seam belongs to the convex tack welding, the tack welding leg size is ≥ 5mm, and the post-weld ≥ 5mm, the formal vertical position fillet weld design theoretical leg size is generally ≤ 5mm, and the tack welding size is larger than the formal The size of the fillet weld is large. When the formal fillet weld covers the tack welding, the shape of the formal fillet weld will be too convex, and the welding molten metal will easily flow, which will affect the shape of the weld.

Furthermore, the welding speed of vertical upward positioning welding is slow, and the welding line energy is large, which is not conducive to the deformation control of thin plates