Method for backing welding of box beam

Abstract

The invention discloses a method for backing welding of a box beam. A connection gap is reserved between the insulation joint box beam and an insulation joint according to needs, and a flexible gasketadheres to the back side of a weld joint after solid welding of an axial adjacent interface point of the insulation joint box beam; then automatic consumable electrode gas shielded welding is used for backing point solid welding and fixing; the to-be-welded box beam obtained after point solid welding is clamped to a rotary welding tool; the angle of a welding gun is adjusted to be 30-50 degrees,the welding gun is adjusted to the position of the weld joint, and the extending length of a welding wire is 10-15 mm; backing welding technical parameters are called for automatic welding backing, and operation workers fine adjust the welding parameters in the welding process by observing a monitor according to real-time online weld pool states and intermittent states on the monitor until the backing process is finished; and after backing is completed, cover surface parameters are called for cover surface filling of the box beam.

Description

technical field [0001] The invention relates to the technical field, in particular to a method for bottoming welding of box girders. Background technique [0002] Existing box girder rooting welding methods usually include argon arc welding, electrode arc welding, automatic melting electrode gas shielded welding and ceramic liner. These methods have the following disadvantages: the bottom welding by argon arc welding and electrode arc welding requires a high level of operation of the welder, and defects such as burn-through and incomplete penetration are prone to occur in actual production, and the quality of the weld seam is very poor. difficult to control. Back welding by argon arc welding and electrode arc welding has low efficiency, poor flatness of the back of the weld seam, requires grinding or machining, and is costly. The back welding is performed with automatic MIG shielded welding and ceramic liner. The ceramic liner needs to be pasted on the liner supporting pla...

AI Technical Summary

Problems solved by technology

These methods have the following disadvantages: the bottom welding by argon arc welding and electrode arc welding requires high operation level of welders, and defects such as burn-through and incomplete penetration are prone to occur in actual production, and the quality of welds is very poor. Difficult to control

Back welding with argon arc welding and electrode arc welding has low efficiency and poor flatness on the back of the weld seam, which requires grinding or machining, and the cost is high

Backing welding with automatic MIGA welding and ceramic liner, the ceramic liner needs to be pasted on the liner pallet, and tooling is required to fix the liner pallet, the mechanism is cumbersome, laborious and time-consuming