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Method for preventing overlaying sealing surface from cracking

A sealing surface and crack technology, which is applied in the field of preventing cracks on the sealing surface of surfacing welding, can solve problems such as cracks, seriousness, and restrictions, and achieve the effects of simplifying the process, improving production efficiency, and improving working conditions

Inactive Publication Date: 2014-07-23
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the valve port of high-strength cast steel valves, high-hardness and wear-resistant materials are surfacing, and the problem of cracks is very serious, which limits the application of surfacing welding.

Method used

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  • Method for preventing overlaying sealing surface from cracking
  • Method for preventing overlaying sealing surface from cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. The welding equipment is DC arc welding machine. The welding power supply has a rated welding current of 350 amps.

[0023] 2. Overlay welding of cast steel valve body. Before the surfacing welding, the surface of the surfacing welding part of the cast steel valve body is polished, and the metallic luster can be seen; the surface of the workpiece must not have oil or moisture; after each layer of surfacing welding, a wire brush is required to remove the oxides on the surface of the surfacing layer.

[0024] 3. The transition layer electrode meets the requirements of GB / T983-2012 "Stainless Steel Electrode". Drying was carried out, and the drying temperature was 100°C. When welding, the workpiece is connected to the negative pole of the power supply, and the welding wire is connected to the positive pole of the workpiece.

[0025] 4. When welding, the ambient temperature is 5°C, and there is no preheating before welding.

[0026] 5. First surfacing the transition ...

Embodiment 2

[0031] 1. The welding equipment is DC arc welding machine. The welding power supply has a rated welding current of 350 amps.

[0032] 2. Overlay welding on the cast steel valve port. Before surfacing welding, the surface of the surfacing welding part of the cast steel valve port is polished, and the metallic luster can be seen; the surface of the workpiece must not have oil or moisture; after each layer of surfacing welding, steel wire brushes are required to remove oxides on the surface of the surfacing layer.

[0033] 3. The transition layer electrode meets the requirements of GB / T983-2012 "Stainless Steel Electrode". Drying was carried out, and the drying temperature was 100°C. When welding, the workpiece is connected to the negative pole of the power supply, and the welding wire is connected to the positive pole of the workpiece.

[0034] 4. When welding, the ambient temperature is 10°C, and there is no preheating before welding.

[0035] 5. First surfacing the transit...

Embodiment 3

[0040] 1. The welding equipment is DC arc welding machine. The welding power supply has a rated welding current of 350 amps.

[0041] 2. Overlay welding on the track of a certain product. Before surfacing, the surface of the surfacing of the torpedo track is polished, and the metallic luster can be seen; the surface of the workpiece must not have oil or moisture; after each layer of surfacing, it is necessary to use a wire brush to remove oxides on the surface of the surfacing layer.

[0042] 3. The transition layer electrode meets the requirements of GB / T983-2012 "Stainless Steel Electrode". Drying was carried out, and the drying temperature was 100°C. When welding, the workpiece is connected to the negative pole of the power supply, and the welding wire is connected to the positive pole of the workpiece.

[0043] 4. When welding, the ambient temperature is 10°C, and there is no preheating before welding.

[0044] 5. First surfacing the transition layer, the welding metho...

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Abstract

The invention relates to an overlaying method, in particular to a method for preventing an overlaying sealing surface from cracking. The method includes the following steps that a direct current arc welding machine is selected as a welding device, the surface of a steel member is polished before overlaying, and no oil stain or water is left on the surface of the steel member; after overlaying of each layer is finished, an overlaying layer needs to be cleaned carefully through a wire brush; when welding is carried out, the steel member is connected with the negative electrode of a power source, and a welding stick is connected with the positive electrode of the power source; angle wrapping weld beads are arranged on the two sides of an overlaying transition layer; the surface of the transition layer is polished; overlaying of the sealing surface is carried out; the quality of the surface of the overlaying layer is detected according to a PT method, if cracks are found, the cracks are polished and removed through a grinding wheel, and then the welding stick of the sealing surface is used for repairing. The sealing surface materials are overlaid on the steel member, shielded metal arc welding is adopted, the welding stick of the A307 type is used as the transition layer, the sealing surface materials are overlaid on the transition layer, welding is carried out in a cold state without preheating, and welding cracks are avoided.

Description

technical field [0001] The invention relates to a surfacing welding method, in particular to a method for preventing cracks on the surfacing welding sealing surface. Background technique [0002] Overlay welding on the cast steel valve body or valve port has excellent wear resistance, impact resistance, oxidation resistance, corrosion resistance and cavitation resistance, which can ensure continuous opening and closing work under high temperature and high pressure. Electrode arc welding is widely used in engineering to surfacing various sealing surface alloy materials on cast steel valve bodies or valve ports, but the problem of surfacing cracks is difficult to solve. In engineering, the method of increasing the preheating temperature is often used to reduce surfacing cracks, but increasing the preheating temperature will make the construction conditions harsh, and the surfacing cracks are still difficult to completely remove. Although the high-hardness and wear-resista...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K9/235
CPCB23K9/042B23K9/235
Inventor 杨芙张文明焦万才王滨张姝杨家武
Owner SHENYANG UNIV
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