Method for repairing internal defects of large-sized forge pieces through electroslag welding with tube electrode

Abstract

The invention discloses a method for repairing internal defects of large-sized forge pieces through electroslag welding with a tube electrode. The method comprises the following steps of: 1, drilling through and removing defects in a workpiece to obtain a defect through hole, and arranging an ending plate and an arc striking plate above and below the defect through hole; 2, making a tube electrode and a welding wire serving as an electrode extend inwards, fixing on the arc striking plate below the inside of the defect through hole, and grounding the workpiece; 3, arcing the welding wire and the arc striking plate in a short-circuiting way, continuously adding a powdery welding flux into the defect through hole, increasing the welding wire feeding speed and lowering the welding voltage to insert the welding wire into a slag basin; 4, increasing a molten welding seam metal, raising the liquid level, cooling and condensing till the slag basin rises to the upper edge of an axle center through hole of the ending plate; and 5, cutting the arc striking plate and the ending plate which are bonded together off, and grinding the upper and lower condensing surfaces of the defect through hole. The method for repairing through electroslag welding with the tube electrode disclosed by the invention is easy, convenient and reliable, and has high welding efficiency.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and relates to a tube electrode electroslag welding repair method for internal defects of large castings and forgings. Background technique [0002] For defects that are not allowed inside large castings and forgings, according to the traditional treatment plan, the defects are removed by machining, and then repaired by gas shielded welding or arc welding. The amount of welding is large, the welding volume is large, the number of welding layers is large, and the probability of defects is high. At the same time, the operator is required to clean up the interlayer and hammer the weld bead to ensure the fusion of the weld and reduce the welding stress; on the other hand, The processing cycle is long, it takes a long time to occupy a large machine tool, the cost is high, the welding cycle is long, and the efficiency is low, which cannot meet the needs of production efficiency. Cont...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a tube electrode electroslag welding repair method for internal defects of large castings and forgings, which solves the problems of conventional welding in the prior art, long preparation time, high welder skill requirements, long welding cycle, and high cost. Problems that cannot meet the production situation

Images