On-site repair and surfacing method for large-area metal walls

Abstract

The invention provides a large-area metal wall surface field patching surfacing welding method. A synchronous moving mechanism is installed on a welding gun of a surfacing welding device, in a surfacing welding process, a graphite sliding block on the synchronous moving mechanism is always located at the back of a welding pool and tightly pressed onto a surface welding layer by an elastic pressing mechanism on the synchronous moving mechanism, the graphite sliding block moves together with the welding gun, and welding current enters into a workpiece through electric arcs from a welding wire of the welding gun and returns to the welding machine power source negative pole from the graphite sliding block. The surfacing welding device comprises the welding gun, a welding machine power source and the synchronous moving mechanism. The synchronous moving mechanism comprises an elastic pressing mechanism and an insulation connecting plate. The elastic pressing mechanism comprises a shell, a pushing plate, a spring, an end cap, the graphite sliding block and a concave disk, and in surfacing welding, the spring generates a pressing force on the graphite sliding block. According to the large-area metal wall surface field patching surfacing welding method, the graphite sliding block is used for achieving the moving type connection between welding machine ground wires and the workpiece, the backward current distribution in the welding pool is strengthened, and combined with an externally added transverse magnetic field or a longitudinal magnetic field, the problems of the welding pool instability and organizational regulation and control caused by the gravity of metal wall surface field patching surfacing welding are solved.

Description

technical field [0001] The invention relates to welding technology, in particular to a large-area metal wall surface on-site repair surfacing welding method and a surfacing welding device. Background technique [0002] Large metal walls are commonly found in factories and large machinery, such as nuclear power plants and ship hulls. With the increase of service age, these metal walls may have problems such as environmental corrosion, fatigue cracks or external force damage. At this time, it is necessary to carry out on-site repair by means of melting electrode arc and other methods. [0003] At present, the problems faced by on-site repair welding of large-area metal walls are as follows: 1. The connection between the welding machine ground wire and the metal wall surface: most metal walls are in a vertical state, and the surface is smooth, and a special device is required to press the welding machine ground wire on On the wall; 2. It belongs to the all-position welding co...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome above-mentioned weak point, and provide a kind of large-area metal wall surface repair surfacing welding method and surfacing welding device, to solve the current large-area metal wall surface in-situ repair welding process, the molten pool is easy to fall under the action of gravity. The problem of accumulation forming failure due to downflow and the ground wire of the welding machine cannot be conveniently pressed against the wall

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