Repair method of submerged arc welding after the squeeze roller of alkali making is worn out

Abstract

The invention provides a submerged-arc welding repair method after an alkali production squeezing roller is worn, and belongs to the field of squeezing roller repair and remanufacturing. The method includes the steps that a workpiece is cleaned, a fatigue layer on the roller surface is removed, the size of the repaired part is detected, and the damage part and the abrasion loss are determined; material analysis and hardness detection are conducted on the parent metal of the squeezing roller, and failure analysis and life evaluation are conducted on the workpiece through metallographic detection; relevant parameters of a welding wire and a submerged-arc welding machine are selected according to the detection result and then welding is conducted on the roller surface of the alkali production squeezing roller; mechanical machining is conducted according to requirements; surface colouration flaw detection and overall ultrasonic flaw detection are conducted on the machined workpiece, and roughness of the roller surface is detected. The method has the advantages of being good in wear resistance, high in hardness and strength, and the phenomena of chip off-falling and falling off cannot occur when the method is used.

Description

technical field [0001] The invention relates to the field of submerged arc welding repair and remanufacturing of extrusion rollers in the field of mechanical repair, in particular to a submerged arc welding repair method for soda making extrusion rollers after wear. Background technique [0002] Because the soda-making extrusion roller bears a large alternating load during operation, it is easy to wear and even crack when it is extruded with the workpiece. Most of the cold-rolled work rolls at home and abroad are made of materials with high content of carbon and alloy elements, such as: 9Cr2Mo, 85CrMoV, 86CrMoV7, 9Cr3Mo and other materials, and then heat treatment methods such as surface quenching are used to achieve the hardness requirement of 62-64HRC, and the manufacturing cost is high. . After failure, due to the difficulty of repairing and remanufacturing, they are generally scrapped, resulting in a serious waste of resources. If it is very difficult to repair and mee...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of roller with good wear resistance, less cracks in the repair layer, and fusion rate between the cladding layer and the base material, aiming at the disadvantages of the existing traditional treatment that the worn extrusion rollers are generally scrapped and the waste of resources is serious. Submerged arc welding repair method after high wear of soda extrusion roller