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High-sealing gas-protecting welding process used for corrugated pipe stop valve for nuclear power

A bellows stop valve and gas protection technology, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of damage, weld gap, high cost, etc., to ensure sealing performance and service life, improve low temperature impact toughness, Guarantees the effect of anti-corrosion performance

Active Publication Date: 2014-12-24
镇江市华阳机电制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]The current bellows stop valve is basically the bellows assembly and the valve body are sealed by pressing the gasket on the top end of the valve body. When assembling, the bellows assembly and the valve body are sealed. The metal powder particles generated by the friction between the valve bodies will enter the inner cavity of the valve body and travel through the entire pipeline and equipment equipped with the bellows globe valve. The metal powder particles are conductors and will cause the equipment to fail. When the equipment is running for a long time, due to the influence of vibration, there may be looseness between the bellows assembly and the valve body, the sealing gasket between the bellows assembly and the valve body will fail, and medium leakage will occur; in addition, only the bellows assembly is sealed once. Due to the limitations of the current technology and material level, after a certain number of times, the bellows itself may be damaged or the gap between the welds may cause medium leakage; the solution where the bellows assembly and the valve body are welded together cannot be disassembled and repaired, only the bellows can be replaced Tube stop valve, higher cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A high-tightness gas-shielded welding process for bellows globe valves for nuclear power, in which the sealing surface between the bellows globe valves for nuclear power and the valve body is gas-shielded surfacing welding of cemented carbide, and the composition of the cemented carbide And the weight percentage is: C: 0.13%, Fe: 6.3%, Si: 0.7%, Mn: 1.4%, W: 5.2%, Mo: 12.7%, Cu: 0.9%, Cr: 23.5%, Al: 0.01%, Ni: 4.1%, the balance is Co and unavoidable impurities;

[0023] The chemical composition and weight percentage of welding wire are: C: 1.3%, Mn: 0.7%, Si: 0.4%, Ni: 1.9%, Mo: 1.7%, Cr: 0.5%, Cu: 0.13%, S: 0.001%, P: 0.01%, the balance is Fe and unavoidable impurities;

[0024] Welding process parameters: welding current 660A, welding voltage 36V, welding speed 52cm / min, welding heat input 37kJ / cm.

Embodiment 2

[0026] A high-tightness gas-shielded welding process for bellows globe valves for nuclear power, in which the sealing surface between the bellows globe valves for nuclear power and the valve body is gas-shielded surfacing welding of hard alloys, and the composition of the hard alloys And the weight percentage is: C: 0.14%, Fe: 6.4%, Si: 0.8%, Mn: 1.5%, W: 5.3%, Mo: 12.8%, Cu: 1.0%, Cr: 23.6%, Al: 0.02%, Ni: 4.2%, the balance is Co and unavoidable impurities;

[0027] The chemical composition and weight percentage of welding wire are: C: 1.4%, Mn: 0.8%, Si: 0.5%, Ni: 2.0%, Mo: 1.8%, Cr: 0.6%, Cu: 0.14%, S: 0.002%, P: 0.02%, the balance is Fe and unavoidable impurities;

[0028] Welding process parameters: welding current 670A, welding voltage 37V, welding speed 53cm / min, welding heat input 38kJ / cm.

Embodiment 3

[0030] A high-tightness gas-shielded welding process for bellows globe valves for nuclear power, in which the sealing surface between the bellows globe valves for nuclear power and the valve body is gas-shielded surfacing welding of hard alloys, and the composition of the hard alloys And the weight percentage is: C: 0.15%, Fe: 6.5%, Si: 0.9%, Mn: 1.6%, W: 5.3%, Mo: 12.9%, Cu: 1.1%, Cr: 23.7%, Al: 0.03%, Ni: 4.3%, the balance is Co and unavoidable impurities;

[0031] The chemical composition and weight percentage of welding wire are: C: 1.5%, Mn: 0.9%, Si: 0.6%, Ni: 2.1%, Mo: 1.9%, Cr: 0.7%, Cu: 0.15%, S: 0.003%, P: 0.03%, the balance is Fe and unavoidable impurities;

[0032] Welding process parameters: welding current 680A, welding voltage 38V, welding speed 54cm / min, welding heat input 39kJ / cm.

[0033]After testing the comprehensive mechanical properties of the welded parts obtained in Examples 1, 2 and 3, all of them have achieved good strength and toughness matching. T...

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Abstract

The invention provides a high-sealing gas-protecting welding process used for a corrugated pipe stop valve for nuclear power. A hard alloy is surfaced on a sealing surface between a corrugated pipe and a valve body by gas protection. The hard alloy is composed of following components in percentage by weight: 0.13-0.15% of C, 6.3-6.5% of Fe, 0.7-0.9% of Si, 1.4-1.6% of Mn, 5.2-5.4% of W, 12.7-12.9% of Mo, 0.9-1.1% of Cu, 23.5-23.7% of Cr, 0.01-0.03% of Al, 4.1-4.3% of Ni and a residual amount of Co and unavoidable impurities. By adopting the high-sealing gas-protecting welding process, a welding part of the sealing surface between the corrugated pipe and the valve body has higher strength, plasticity, toughness and anti-corrosion performance and has a good sealing effect.

Description

technical field [0001] The invention relates to a production process of a cut-off valve, in particular to a high-seal gas shielded welding process for a bellows stop valve used in nuclear power. Background technique [0002] The current bellows globe valve is basically sealed by the bellows assembly and the valve body by pressing the gasket on the top end of the valve body. During assembly, the metal powder particles generated by the friction between the bellows assembly and the valve body will enter the inner cavity of the valve body. Running through the entire pipeline and equipment equipped with bellows stop valves, metal powder particles are conductors, which will cause equipment failure. There may be looseness between the component and the valve body, failure of the sealing gasket between the bellows component and the valve body, and medium leakage; in addition, only the bellows component is sealed once. Due to the current process and material level limitations, after a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/16B23K35/30
CPCB23K9/04B23K9/16B23K35/3053
Inventor 陈雨民
Owner 镇江市华阳机电制造有限公司
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