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Overlay Welding Repair Method for Short Side Copper Plate Side of Continuous Casting Mold

A continuous casting crystallizer and crystallizer copper plate technology, applied in the field of metallurgical industry, can solve problems such as easy peeling, and achieve the effect of prolonging the service life and having both production efficiency and cost advantages

Active Publication Date: 2020-07-24
泰尔(安徽)工业科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current repair methods mainly include the following two types: 1. Repair the side of the copper plate on the short side of the crystallizer by thermal spraying technology, because the size of the repair coating is thin (<1mm), subject to certain restrictions. At the same time, the thermal spraying technology obtained The repair layer and the surface of the copper substrate are mainly mechanically bonded, which is prone to peeling off during use; Second, the laser cladding method is used to repair the side of the copper plate on the short side of the crystallizer. Although a metallurgically bonded repair layer can be obtained, due to laser cladding The characteristics of the method determine that it is very difficult to prepare a defect-free repair layer on the copper substrate (thermal conductivity and reflectivity); in addition, the cladding layer needs to be remelted to restore the hardness of the copper substrate, so laser cladding repair is used The method on the side of the copper plate on the short side of the crystallizer has not been industrialized

Method used

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  • Overlay Welding Repair Method for Short Side Copper Plate Side of Continuous Casting Mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The surfacing repair method of the short side copper plate side of the continuous casting crystallizer of the present invention, its specific steps are:

[0024] (1) Pre-surfacing treatment: Clean the short-side copper plate of the continuous casting crystallizer to be repaired;

[0025] (2) Flaw detection and processing: flaw detection and machining of the mold copper plate to be repaired;

[0026] (3) Preheating before welding: preheat the mold copper plate to be repaired, the preheating temperature is 400 ° C ~ 500 ° C;

[0027] (4) Welding: Automatic MIG welding method (melting inert gas shielded welding) is adopted, the welding torch moves back and forth, and the weld bead overlaps to form a metallurgically bonded repair layer on the surface of the crystallizer copper plate, thereby completing the surfacing repair; the whole welding process Heating and heat preservation devices are used in the process to ensure that the copper plate of the crystallizer is not lowe...

Embodiment 2

[0034] The specific process parameters of the automatic MIG welding method in step (4) are: current: 240-250A; voltage: 27-28V; speed: 15-20cm / min; gas flow: 15-20L / min.

[0035] The advantages of automatic MIG welding are: a large current is concentrated in the welding part, and the heat can be concentrated very quickly to melt the material to be welded. Due to the good thermal conductivity of copper itself, it is not easy to weld: the welding current is small and it is not easy to melt the surfacing surface, and the welding current will cause serious deformation, so the surfacing welding on copper surface has not been applied at present. In the present invention, the appropriate voltage and current are selected to control the temperature of the copper plate of the crystallizer during the whole welding process, which not only ensures that the surface of the copper plate is slightly melted during welding, but also does not cause deformation due to large-scale melting.

Embodiment 3

[0037] During automatic MIG welding in step (4), the width of a single pass of the surfacing layer is 10-12 mm, the thickness of a single layer is 3.0-3.5 mm, and the overlapping amount of adjacent surfacing layers is 40% to 50% of the width of a single pass of the surfacing layer. %.

[0038] The thickness of single-layer repair is set according to the amount of wear on the side of the copper plate on the short side of the crystallizer, and the width and overlap of the single layer are determined according to the width of the side of the copper plate on the short side of the mold and by adjusting the welding process parameters. Set the width of single-pass surfacing repair and the corresponding lap joint within the width range of the side width of the copper plate on the short side of the crystallizer to ensure the integrity of the entire side repair. In this way, production efficiency can be improved and costs can be reduced. At the same time, by adopting the repair method ...

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Abstract

The invention discloses a surfacing repair method for the side face of a short-sided copper plate of a continuous casting mold. The surfacing repair method comprises the steps of: (1) treatment beforesurfacing, (2) flaw detection and processing, (3) preheating before welding, (4) welding, (5) cooling, (6) flaw detection, (7) heat treatment, and (8) processing after heat treatment. The surfacing repair method can effectively solve the metallurgical bonding problem between a repair layer and a crystalline copper matrix, meanwhile, the thickness of the repair layer is relatively thick, the hardness of the repair layer is equal to that of the matrix, and the service life of the continuous casting mold is greatly prolonged.

Description

technical field [0001] The invention relates to the field of metallurgical industry, in particular to a method for repairing the short-side copper plate side of a continuous casting crystallizer by surfacing welding. Background technique [0002] Since the iron and steel industry entered the era of continuous casting and rolling, it has high efficiency, good quality and low cost. As one of the key components of continuous casting equipment, the continuous casting crystallizer's design and manufacture directly affect the cost and efficiency of continuous casting. The slab continuous casting mold is composed of two long-side copper plates and two short-side copper plates: since the short-side copper plates are easier to machine and repair than the long-side copper plates, the long-side copper plates are mainly strengthened during design and production , while the side of the short side copper plate (such as figure 1 The wear problem of surface A and surface B shown in ) is s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/00
CPCB23P6/007
Inventor 李申申吴松董振启黄东保谭兴海王星潘海李戴伟范郭超
Owner 泰尔(安徽)工业科技服务有限公司
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