Welding process of dual-face water cooling wall for boiler

Abstract

The invention relates to the technical field of water cooling wall processing, and particularly discloses a welding process of a dual-face water cooling wall for a boiler. The welding process comprises the following specific steps that round steel and flat steel are subjected to heat treatment; before welding, rust and oil dirt on pipes, the flat steel and the round steel are ground away till themetal luster is exposed, and the joints of all the pipes, the flat steel and the round steel are ground to be level; the width and the side deflection of the flat steel are subjected to finishing according to the outer diameter of the pipes; the pipes, the flat steel and the round steel enter an MPM automatic welding machine to be welded and arranged; welding slag sundries are cleared away, and welding seam defects are ground; and pipe row correction is carried out. According to the welding process of the dual-face water cooling wall, through the MPM automatic welding machine, the flat steel on the vertical faces of the pipes is firstly welded, then the round steel on the horizontal faces of the pipes is welded, no manpower is needed for welding, and the welding automation degree reaches 99%; and meanwhile, the welding period is shortened, the welding quality is improved, pipe deformation is reduced, the cost and work difficulty are reduced, and the market competitiveness of products is improved.

Description

technical field [0001] The invention belongs to the technical field of water-cooled wall processing, and in particular relates to a welding process for double-sided water-cooled walls for boilers. Background technique [0002] The water-cooled wall is the main heating part of the boiler. It is composed of several rows of steel pipes and distributed around the boiler furnace. Its interior is flowing water or steam, and the outside receives the heat of the flame of the boiler furnace. Generally, the water-cooled wall is composed of multiple tubes. The traditional welding process scheme is to first weld the flat steel on the horizontal plane of the pipe through multi-head welding to weld the pipe into a pipe row, and then manually assemble and then manually weld. When welding vertical flat steel, it is necessary to do a lot of anti-deformation tooling, then perform manual welding, and then perform flame correction. Manual welding has the following disadvantages: 100% of vertica...

AI Technical Summary

Problems solved by technology

When welding vertical flat steel, it is necessary to do a lot of anti-deformation tooling, then perform manual welding, and then perform flame correction. Manual welding has the following disadvantages: 100% of vertical flat steel is welded by hand, and the number of welding meters is large, and natural production The cycle is long; during manual welding, the pitch center of the tube panel is small, which is prone to defects such as false welding and poor forming; before welding, high-skilled welding personnel are required to prevent deformation of the welding part and draw the corresponding welding sequence. There is also deformation; when welding, due to local high temperature heating, the temperature distribution on the pipe is uneven, which eventually leads to welding stress and deformation inside the structure; due to welding deformation: longitudinal shrinkage deformation, transverse shrinkage deformation, angular deformation, bending deformation, distortion Deformation, etc., lead to flame correction and easy hard spots; due to welding deformation: longitudinal shrinkage deformation, transverse shrinkage deformation, geometric dimensions need to be adjusted repeatedly, and correspondingly increase the welding amount again; due to welding deformation: longitudinal shrinkage deformation , lateral shrinkage deformation, angular deformation, bending deformation, twisting deformation, etc., flat steel is easy to crack during heat treatment