Repair welding method for penetration crack of sealing structure

Abstract

The invention discloses a repair welding method for a penetration crack of a sealing structure. The repair welding method comprises the following steps that a) a crack is removed; b) welding groove processing is carried out; c) a welding base plate is modified; d) a base plate assembly is manufactured; e) the welding base plate is installed; f) a workpiece is preheated; and g) repair welding is carried out on the workpiece. According to the repair welding method for the penetration crack of the sealing structure, the effects that he welding base plate can smoothly penetrate through a welding groove of a narrow root gap and can be accurately placed on the inner wall of the structure, namely, the back part of the welding groove are achieved, and the method is also suitable for the bent and deformed cracks; and the process avoids the situation that process holes are additionally added in a closed structure, the base plate welding repair welding with stable quality is achieved, meanwhile,repair welding deformation and residual stress are greatly reduced, and the problem that a part of the sealing structure cannot be repaired through repair welding is solved.

Description

technical field [0001] The patent of the present invention belongs to the technical field of restoration, and is especially suitable for repair welding of mining sealing structures. Background technique [0002] Mining excavators, mining trucks and other equipment are used for mining and transportation of ore, coal and tailings in large-scale open-pit mines. The working environment is harsh and complicated, and continuous operations are required regardless of day and night. The stability requirements are very high; in order to achieve the purpose of reducing weight and ensuring strength at the same time, most of the key structural parts adopt a sealed box structure. However, once a penetrating crack occurs in the sealing structure, it is difficult to repair and repair by welding, and the workload is large. Moreover, the residual stress and welding deformation after welding are very serious, the quality of the weld cannot be guaranteed, and the repaired structural parts are p...

AI Technical Summary

Problems solved by technology

However, once a penetrating crack occurs in the sealing structure, it is difficult to repair and repair by welding, and the workload is large, and the residual stress and welding deformation after welding are very serious, the quality of the weld cannot be guaranteed, and the repaired structural parts are prone to failure again

At the same time, most of our company's mining equipment is exported abroad and used in remote foreign mines. The related repair welding repair conditions are very bad, and the commonly used repair welding repair operations cannot be implemented at all, or it takes a very long time; and the equipment is pulled back. In China, it is basically impossible to return to the factory for repair.

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