A kind of process of surfacing welding compound (re)manufacturing continuous casting roll

Abstract

The invention discloses a process for (re)manufacturing continuous casting rolls with surfacing welding. Non-destructive testing of size, base metal composition, performance, and internal and external defects; (3) Determine the surfacing welding process after evaluating the surfacing welding process according to the base metal, surfacing welding materials, and surfacing welding methods and methods, and determine the surfacing welding process according to the process parameters determined by the surfacing welding process ; (4) One-time single-layer surfacing welding is carried out, and the actual unilateral surfacing thickness of the roll is the thickness of the drawing roll that needs to be surfacing + 1 ~ 2.5mm; (5) According to the requirements of the drawing, the composition, hardness and The organization conducts inspections, and at the same time conducts flaw detection inspections on the surfacing layer. The process increases the height of the weld seam and forms a single-layer surfacing welding to carry out composite (re)manufacturing of the continuous casting roll surfacing welding, which is beneficial to the uniformity of the structure and performance of the welding seam, and is beneficial to improving the service life of the roll.

Description

technical field [0001] The present invention relates to a process for surfacing composite (re)manufacturing continuous casting rolls, in particular to a process for single-layer surfacing and forming composite (re)manufacturing continuous casting rolls, and belongs to the technical field of roll surfacing composite (re)manufacturing . Background technique [0002] As the core component of the continuous casting equipment, the continuous casting roll is responsible for the task of conveying the continuous casting slab. However, the continuous casting roll is under the dual action of high-temperature steel slab and cooling water, and the working conditions are very harsh. Under the action of mechanical and thermal loads, the continuous casting During the use of casting rolls, due to the different degrees of network cracks, oxidative corrosion, wear damage and other damages on the roll surface, the rolls not only consume a lot of money and are expensive, but also the quality of...

AI Technical Summary

Problems solved by technology

At present, the commonly used welding processes for continuous casting rolls are mostly submerged arc welding and open arc welding. When single-wire arc welding is used, it is only 5-6.5kg / h, and the thickness of one side of the surfacing layer is generally 2.0mm-2.5mm. Therefore, it is necessary to The surfacing welding time is longer, and the production efficiency is not high; and the field practice shows that: the longer the surfacing welding time, the more surfacing layers, the more prone to surfacing defects

Especially in multi-layer welding, the upper layer will produce a certain thickness of heat-affected zone on the lower layer, which will have an adverse effect on the weld metal structure and its mechanical uniformity, and seriously damage the service life of the continuous casting roll.

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