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Hardfacing process

A process and electrode technology, applied in the direction of manufacturing tools, welding equipment, arc welding equipment, etc., can solve the problems of easy cracking, affecting product quality, affecting the service life of water spray desuperheaters, etc., to avoid welding cracks, the process is simple, Ensure the effect of welding quality

Inactive Publication Date: 2018-11-23
哈尔滨哈锅锅炉容器工程有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Wear-resistant alloys are surfacing welded at both ends of the spray desuperheater of the boiler product, and the screws of the spray desuperheater rub against the cylinder body to prevent damage to the cylinder body and affect the service life of the spray desuperheater. However, the existing welding Easy to crack during the process, such as figure 1 As shown, it affects the product quality and is not conducive to the long-term use of the sprinkler desuperheater

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment studies on the low-alloy heat-resistant steel 12Cr1MoVG, surfacing wear-resistant fusion welding metal EDCrNi-A-15 (D547) new technology, the main chemical composition (mass fraction, %) of the low-alloy heat-resistant steel 12Cr1MoVG pipe is as follows Show:

[0023] C: 0.08-0.15

[0024] Mn: 0.40-0.70

[0025] Si: 0.17-0.37

[0026] P: ≤0.03

[0027] S: ≤0.03

[0028] Cr: 0.90-1.20

[0029] Mo: 0.25-0.35

[0030] V: 0.15-0.30

[0031] Cu: ≤0.20

[0032] 1. Pre-welding preparations, choose Jinglei welding consumables with an outer diameter of 4.0mm and a brand of GEH-547 (D547) welding rods. The composition and performance of the welding consumables meet the standard requirements of EDCrNi-A-15 in GB / T984. The wear-resistant welding metal for surfacing welding is EDCrNi-A-15 (D547);

[0033]

[0034] 2. Remove water, rust, oil stains and other impurities on the surface to be surfacing until the metallic luster is exposed;

[0035] 3. Prehea...

Embodiment 2

[0038] This embodiment studies on the low-alloy heat-resistant steel 12Cr1MoVG, surfacing wear-resistant fusion welding metal EDCrNi-A-15 (D547) new technology, the main chemical composition (mass fraction, %) of the low-alloy heat-resistant steel 12Cr1MoVG pipe is as follows Show:

[0039] C: 0.08-0.15

[0040] Mn: 0.40-0.70

[0041] Si: 0.17-0.37

[0042] P: ≤0.03

[0043] S: ≤0.03

[0044] Cr: 0.90-1.20

[0045] Mo: 0.25-0.35

[0046] V: 0.15-0.30

[0047] Cu: ≤0.20

[0048] 1. Pre-welding preparations, choose Jinglei welding consumables with an outer diameter of 4.0mm and a brand of GEH-547 (D547) welding rods. The composition and performance of the welding consumables meet the standard requirements of EDCrNi-A-15 in GB / T984. The wear-resistant welding metal for surfacing welding is EDCrNi-A-15 (D547);

[0049]

[0050] 2. Remove water, rust, oil stains and other impurities on the surface to be surfacing until the metallic luster is exposed;

[0051] 3. Prehea...

Embodiment 3

[0054] This embodiment studies on the low-alloy heat-resistant steel 12Cr1MoVG, surfacing wear-resistant fusion welding metal EDCrNi-A-15 (D547) new technology, the main chemical composition (mass fraction, %) of the low-alloy heat-resistant steel 12Cr1MoVG pipe is as follows Show:

[0055] C: 0.08-0.15

[0056] Mn: 0.40-0.70

[0057] Si: 0.17-0.37

[0058] P: ≤0.03

[0059] S: ≤0.03

[0060] Cr: 0.90-1.20

[0061] Mo: 0.25-0.35

[0062] V: 0.15-0.30

[0063] Cu: ≤0.20

[0064] 1. Pre-welding preparations, choose Jinglei welding consumables with an outer diameter of 4.0mm and a brand of GEH-547 (D547) welding rods. The composition and performance of the welding consumables meet the standard requirements of EDCrNi-A-15 in GB / T984. The wear-resistant welding metal for surfacing welding is EDCrNi-A-15 (D547);

[0065]

[0066] 2. Remove water, rust, oil stains and other impurities on the surface to be surfacing until the metallic luster is exposed;

[0067] 3. Prehea...

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Abstract

The invention provides a hardfacing process, and relates to a welding process. The hardfacing process comprises the steps of one, preparation before welding: selecting suitable welding rods and wear-resistant fusion welding metals; two, removing impurities of a surface to be subjected to hardfacing until the surface has metallic lustre; three, preheating before hardfacing and layer temperature control: wrapping a pipe of a welded portion before welding in the annular direction and uniformly heating the pipe; and four, slow cooling after welding: continuously welding the preheated pipe, alwayscontrolling the temperature of the pipe, and covering the pipe after hardfacing to insulate and slowly cool the pipe so as to finish buildup welding. According to the process, repeated tests are carried out, process parameters are adjusted, and welding cracks are avoided through measures of preheating before welding and slow cooling after welding.

Description

technical field [0001] The invention relates to a welding process, in particular to a wear-resistant surfacing welding process. Background technique [0002] Wear-resistant alloys are surfacing welded at both ends of the spray desuperheater of the boiler product, and the screws of the spray desuperheater rub against the cylinder body to prevent damage to the cylinder body and affect the service life of the spray desuperheater. However, the existing welding Easy to crack during the process, such as figure 1 As shown, it affects the product quality and is not conducive to the long-term use of the sprinkler desuperheater. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the invention provides a wear-resistant surfacing welding process. The process has been tested repeatedly, the process parameters are adjusted, and the welding cracks are avoided through the measures of preheating before welding and slow cooling after welding. [00...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K9/235
CPCB23K9/048B23K9/235
Inventor 赵国洋赵丹于鹏飞刘德余
Owner 哈尔滨哈锅锅炉容器工程有限责任公司
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