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Large-diameter valve sealing ring surfacing method

A valve sealing and large-diameter technology, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as poor product quality, cracking of the surfacing layer, and large dilution rate of the surfacing layer, so as to improve product quality and production High efficiency, improved hardness and wear resistance, and reasonable welding process parameters

Inactive Publication Date: 2018-09-14
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the surfacing welding process of the valve sealing ring, the following problems generally exist: the difference in thermal expansion coefficient between the valve sealing ring and the cemented carbide material will cause the surfacing layer to crack; the welding process parameters are unreasonable, resulting in excessive dilution of the surfacing layer. The hard alloy in the surfacing layer is diluted by the base metal, and the hardness of the surfacing layer cannot meet the requirements; for large-diameter valve sealing rings, unreasonable welding methods and welding process parameters will also cause distortion and deformation
The above problems lead to poor product quality and low yield of one-time surfacing welding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Welding method and selection of welding materials: AC tungsten argon arc welding is used for transition layer surfacing, and ER310 stainless steel wire with a diameter of 2.5mm is used as the welding wire. The surfacing method of hard alloy surfacing layer adopts plasma arc powder surfacing welding, and the welding material adopts Co-Cr-Mo-Si-rare earth alloy powder.

[0044] (2) Preparation before welding: Flatten the sealing surface of the valve to be surfacing, without defects such as cracks and pits, and then clean the surface to be surfacing with acetone to ensure that there is no water, oil, etc., and ER310 welding wire and Co-Cr -Mo-Si-rare earth alloy powders were baked at 150°C for 2h.

[0045] Wherein, the chemical composition (wt.%) of the Co-Cr-Mo-Si-rare earth alloy powder is specifically Cr: 12%; Mo: 20%; Si: 2.5%; Al: 3%; Ta: 1.5% ; Yttrium oxide: 0.3%; Cerium oxide: 0.1%; The balance is Co, and the particle size range of the original powder is 200-3...

Embodiment 2

[0055] (1) Welding method and selection of welding materials: AC tungsten argon arc welding is used for transition layer surfacing, and ER310 stainless steel wire with a diameter of 2.5mm is used as the welding wire. The surfacing method of hard alloy surfacing layer adopts plasma arc powder surfacing welding, and the welding material adopts Co-Cr-Mo-Si-rare earth alloy powder.

[0056] (2) Preparation before welding: Flatten the surface of the valve sealing ring to be surfacing without cracks, pits and other defects, then clean the surface to be surfacing with acetone to ensure that there is no water, oil, etc., and put ER310 welding wire and Co- Cr-Mo-Si-rare earth alloy powders were baked at 180°C for 2.5h.

[0057] (3) Surfacing transition layer:

[0058] AC tungsten argon arc welding is used to surfacing welding ER310 welding wire on the flat sealing surface of the car. Multi-layer and multi-pass welding is used. After one welding is completed, the next one is welded unt...

Embodiment 3

[0065] (1) Welding method and selection of welding materials: AC tungsten argon arc welding is used for transition layer surfacing, and ER310 stainless steel wire with a diameter of 2.5mm is used as the welding wire. The surfacing method of hard alloy surfacing layer adopts plasma arc powder surfacing welding, and the welding material adopts Co-Cr-Mo-Si-rare earth alloy powder.

[0066] (2) Preparation before welding: Flatten the surface of the valve sealing ring to be surfacing without cracks, pits and other defects, then clean the surface to be surfacing with acetone to ensure that there is no water, oil, etc., and put ER310 welding wire and Co- Cr-Mo-Si-rare earth alloy powders were baked at 200°C for 3h.

[0067] (3) Surfacing transition layer:

[0068] AC tungsten argon arc welding is used to overlay welding ER310 welding wire on the flat sealing surface of the car. Multi-layer and multi-pass welding is used. After one welding is completed, the next one is welded until t...

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Abstract

The invention relates to a large-diameter valve sealing ring surfacing method. A transition layer is added between a valve sealing face and a hard alloy layer, the transition layer selects an ER310 welding wire, and hard alloy selects Co-Cr-Mo-Si-rare earth alloy powder. During surfacing the transition layer and the hard alloy layer, welding parameters and heat treatment temperature are reasonablyselected. Thus, the welding deformation is reduced, the hardness of a surfacing layer is improved, and the cracking phenomenon occurring during directly surfacing the hard alloy layer on the valve sealing face is avoided.

Description

technical field [0001] The invention relates to a welding process, in particular to a surfacing welding method for a sealing ring of a large-diameter valve. Background technique [0002] High-temperature, wear-resistant valves are mainly used in the fields of energy and chemical industry, and are used in key occasions with extremely harsh working conditions. The working temperature of the valve is often higher than 400°C, subject to fluid erosion and medium corrosion, and the valve switch is frequent. Once the valve sealing surface leaks, it will cause major economic losses and seriously threaten the safety of production personnel. This requires the valve sealing surface It must have excellent corrosion resistance, wear resistance and high temperature resistance. [0003] In order to improve the performance of the valve sealing surface, the traditional method is to surfacing a layer of hard alloy on the valve sealing ring, and the surfacing process has a great influence on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/167B23K9/235
CPCB23K9/042B23K9/167B23K9/235
Inventor 薛海涛贾俊亚陆志明靳伟李永艳
Owner HEBEI UNIV OF TECH
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