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Surfacing repairing method for coiled side guide plate

A repair method and side guide plate technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of affecting the service life of the side guide plate, the cracking and peeling of the surfacing alloy layer, and the surface quality of the pressed steel plate, so as to achieve excellent anti-corrosion High-temperature wear performance between metals, good bonding, and high repair efficiency

Active Publication Date: 2019-06-14
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, ER50-6 solid wire gas shielded welding is generally used to repair and polish the worn groove of the side guide plate. The hardness of the weld metal after repair welding is only about HRC20. Under this severe friction condition, the repair welding area Very easy to wear and tear, although timely maintenance is carried out, but labor-intensive and high production cost
For the 718 side guide plate, if the conventional repair method is used to repair the worn area, the disadvantage is that the repaired welding area is not wear-resistant, and it is easy to wear and fail quickly; if the wear-resistant alloy is used for surfacing repair, if the selected welding material and Improper welding process, cracks are easy to occur during surfacing repair, and an intergranular network or dendritic hypoeutectic structure is easily formed at the interface between the surfacing metal and the substrate, causing the surfacing alloy layer to crack and peel off, and peel off fragments It is very easy to be brought into the coiler, pressed into the surface of the steel plate to cause quality defects, and the cracks generated by the surfacing welding even extend to the substrate to make it invalid, seriously affecting the service life of the side guide plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the 718 material coiling side guide plate with a wear groove depth of 5-7 mm is repaired by adopting the surfacing welding repair method of the coiling side guide plate in the present invention.

[0035] Step 1: Prepare for Welding

[0036] (1) Use carbon arc gouging to process the wear groove area of ​​the 718 material coiling side guide plate into a U-shaped groove, the angle of the U-shaped groove is 23-25°, the bottom of the groove has a circular arc transition, and the width of the groove surface is 10 -12mm with a depth of 7-9mm.

[0037] (2) Use an angle grinder to grind and remove the carbonized layer on the inner side of the groove and within 30-50 mm on both sides of the groove until the metallic luster is exposed, and the inner side of the groove should be flat and smooth.

[0038] Step 2: Solder Repair

[0039] (1) When the ambient temperature is ≥ 5°C, the 718 material coiling side guide plate is not preheated before welding; when the ...

Embodiment 2

[0047] In this embodiment, the 718 material coiling side guide plate with a wear groove depth of 11-13 mm is repaired by adopting the surfacing welding repair method of the coiling side guide plate in the present invention.

[0048] Step 1: Prepare for Welding

[0049] (1) Use carbon arc gouging to process the wear groove area of ​​the 718 material coiling side guide plate into a U-shaped groove, the angle of the U-shaped groove is 15-18°, the bottom of the groove has a circular arc transition, and the width of the groove surface is 25 -28mm with a depth of 12-14mm.

[0050] (2) Use an angle grinder to grind and remove the carbonized layer on the inner side of the groove and within 30-50 mm on both sides of the groove until the metallic luster is exposed, and the inner side of the groove should be flat and smooth.

[0051] Step 2: Solder Repair

[0052] (1) When the ambient temperature is ≥5°C, the 718 material coiling side guide plate is not preheated for cold welding befor...

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Abstract

The invention discloses a surfacing repairing method for a coiled side guide plate. By reasonably matching an abrasion-resistant alloy surfacing material and a welding process, the hardness of surfaced metal can reach HRC42-HRC48, thus, the areas, close to the roller bed surface and in contact with the edge of strip steel, of the coiled side guide plate have good high-temperature abrasion resistance, and the defects such as strip steel edge damage and scabbing are reduced. After the 718 material coiled side guide plate is subjected to surfacing repairing, surfaced metal is well combined with base metal, welding defects such as cracks, slag inclusions, pores and incomplete fusion are avoided, preheating does not need to be conducted or low-temperature preheating is conducted before welding,a surfacing transition layer is not needed, heat treatment does not need to be conducted after welding, the manufacturing process is simple, surfacing procedures are few, the repairing efficiency ishigh, the production cost can be reduced through many times of repairing, and the coiled side guide plate is recycled.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material welding, and in particular relates to a surfacing welding repair method for a coiling side guide plate. Background technique [0002] The main function of the side guide device of the hot continuous rolling mill is to guide the strip steel into the pinch roll and exert a certain clamping force on the strip steel, so as to prevent the deviation of the strip steel, and the occurrence of defects such as tower shape and staggered layers during the coiling process of the strip steel. To ensure that the end face of the steel coil is neat. Due to the severe sliding friction of the coiling side guide plate in the contact process between the area close to the roller surface and the edge of the strip, it is very easy to grind grooves on the surface of the side guide plate, and the worn groove depth is greater than 5mm-13mm and needs to be replaced. Conventional The material take-up side gui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/235B23K35/30
Inventor 李丽田猛韩丽梅朱晨龙
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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