Build up welding method for repairing cold rolling and leveling supporting rollers

A support roller and leveling technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of waste of resources, poor weldability, difficulty in ensuring uniform hardness, etc., and achieve cost saving, low cost, and economical improvement Use the effect of value

Inactive Publication Date: 2016-01-06
PANZHIHUA GANGCHENG GRP XIELI
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  • Abstract
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AI Technical Summary

Problems solved by technology

When the cold-rolled leveling backup roll fails, because of its high C content and high alloying elements, it has a strong tendency to harden. Cold cracks are easily generated during the surfacing process, and the weldability is poor. The hardness after surfacing The uniformity is not easy to guarantee, and the hardness difference of the roll body is required to be less than or equal to HRC2. Therefore, when the roll fails, all iron and steel enterprises scrap it directly and do not repa

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  • Build up welding method for repairing cold rolling and leveling supporting rollers
  • Build up welding method for repairing cold rolling and leveling supporting rollers
  • Build up welding method for repairing cold rolling and leveling supporting rollers

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[0035] Examples:

[0036] Select a failed roll and use CT-E magnetic particle detector to perform 100% coloring flaw detection on the roll surface. It is found that there are hot cracks on the roll surface, no slag inclusion, lack of penetration, lack of fusion and other defects. No ≥φ2.0mm Single defect. After the backup roll is repaired, use TH160 Li-style hardness tester to test the hardness of the roll surface and roll neck. The hardness test results are shown in Table 3.

[0037] Table 3 Surface hardness of backup roll after surfacing

[0038]

[0039] It can be seen from the above table that the hardness of each point on the surface of the cold-rolled smooth support roll after surfacing welding is uniform, the hardness is HSD66.7~69.8, the hardness uniformity is ±HSD1.55, and the average hardness of the four directions is HSD68.2-68.4 In between, the quality is equivalent to that of the new roller, and it is fully qualified for use.

[0040] After surfacing the cold-rolled lev...

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Abstract

The invention discloses a build up welding method for repairing cold rolling and leveling supporting rollers in the technical field of welding. The method includes the following steps of firstly, removing fatigue layers and cracks on the surfaces of the rollers; secondly, preheating the rollers to a certain temperature; thirdly, conducting welding, wherein in the welding process, working layers are welded after base layers are welded, and dehydrogenation is conducted after welding is completed; fourthly, conducting machining to polish build up welding layers. The method has the advantages that the rollers which lose efficacy are processed through ordinary flux-coated wires, the specific build up welding method and specific build up welding conditions, cost is low, the method is simple and easy to implement, the roller surface hardness of the rollers repaired through the method is between HS66.7 and HS69.8, the hardness uniformity is +/-HS1.55 and is superior than that of new rollers, the service life of the repaired rollers is equivalent with that of the new rollers, the repaired rollers completely meet use conditions, the rollers which lose efficacy are used again, cost is saved, and economization use value of metallurgy waste of the type is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a surfacing method for repairing cold-rolled leveling support rolls. Background technique [0002] The cold-rolled leveling backup roll is a key part of the skin-leveling unit, which mainly adjusts the mechanical properties of the strip, eliminates the yield plateau and slight surface defects, and is an important metallurgical spare part. During the rolling process, the back-up rolls are on the machine for 15-20 days each time, and are subjected to additional stress caused by irregular wear, roll bending force, rolling impact, etc. The working conditions are very harsh, and the main failure forms are wear and peeling. [0003] For cold-rolled leveling backup rolls, only two or three domestic enterprises such as First Heavy Machinery Group have the ability to manufacture leveling backup rolls. The material generally adopts high-carbon or high-alloy materials such as 70Cr2Mn2MoV,...

Claims

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Application Information

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IPC IPC(8): B23K9/04
CPCB23K9/048
Inventor 卢金
Owner PANZHIHUA GANGCHENG GRP XIELI
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