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Valve disc multi-position plasma stellite spray welding process method

An alloy process and plasma technology, applied in the field of spray welding Stellite alloy process and welding process, can solve the problems of complex process flow, poor surfacing quality, easy cracking, etc., to achieve simple process flow, reduce production costs, avoid The effect of welding cracks

Active Publication Date: 2017-07-25
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the valve disc is still made of austenitic welding materials first, and then surfacing welding of Stellite alloy, there will be at least ten times of repeated surfacing welding and repeated clamping, and the process will be extremely complicated. There are problems of cracking and poor surfacing welding quality during welding
[0005] In order to overcome the shortcomings of the current overlay welding technology for the sealing surface of steam turbine valve discs, such as complex process flow, low efficiency, high dilution rate, and low pass rate, and to avoid defects such as cracks, the present invention proposes the use of multi-position plasma spray welding Stellite alloy process

Method used

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  • Valve disc multi-position plasma stellite spray welding process method

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Effect test

Embodiment 1

[0062] Such as figure 1 As shown, the present embodiment takes the following valve disc as an example. Among them, the size of each surface of the valve disc to be welded is: the diameter of the inner circular surface 1 is 30mm, the diameter of the small end of the inner cone surface 2 is 30mm, the cone angle is 30°, the width of the inner cone surface is 18mm, and the diameter of the outer cone surface 3 is large. The end diameter is 200mm, the taper angle is 30°, the diameter of the large end of the outer end surface 4 is 200mm, the diameter of the outer large circular surface 5 is 150mm, and the diameter of the outer small circular surface 6 is 40mm.

[0063] Such as figure 1 As shown, a multi-position plasma spray welding Stellite alloy process method of a valve disc in this embodiment includes the following steps:

[0064] Step 1. Perform plasma spray welding of Stellite alloy on the inner circular surface 1, inner conical surface 2 and outer conical surface 3 of the v...

Embodiment 2

[0086] This embodiment is basically the same as Embodiment 1, the difference is:

[0087] Such as figure 1 As shown, the present embodiment takes the following valve disc as an example. Among them, the size of each surface of the valve disc to be welded is: the diameter of the inner circular surface 1 is 50mm, the diameter of the small end of the inner cone surface 2 is 50mm, the cone angle is 45°, the width of the inner cone surface is 20mm, and the diameter of the outer cone surface 3 is large. The end diameter is 260mm, the taper angle is 45°, the diameter of the large end of the outer end surface 4 is 260mm, the diameter of the outer large circular surface 5 is 220mm, and the diameter of the outer small circular surface 6 is 70mm.

[0088] In this embodiment, in step 1,

[0089] The welding process parameters of the inner circular surface 1 are: transferred arc current 100-120A, transferred arc voltage 22V, welding speed 80mm / min, alloy powder feeding speed 18g / min, swi...

Embodiment 3

[0097] This embodiment is basically the same as Embodiment 1, the difference is:

[0098] Such as figure 1 As shown, the present embodiment takes the following valve disc as an example. Among them, the size of each surface of the valve disc to be welded is: the diameter of the inner circular surface 1 is 80mm, the diameter of the small end of the inner cone surface 2 is 80mm, the cone angle is 60°, the width of the inner cone surface is 30mm, and the diameter of the outer cone surface 3 is large. The end diameter is 400mm, the taper angle is 60°, the diameter of the large end of the outer end surface 4 is 400mm, the diameter of the outer large circular surface 5 is 350mm, and the diameter of the outer small circular surface 6 is 100mm.

[0099] In this embodiment, in step 1,

[0100] The welding process parameters of the inner circular surface 1 are: transferred arc current 120-130A, transferred arc voltage 25V, welding speed 150mm / min, alloy powder feeding speed 30g / min, s...

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Abstract

The invention discloses a stellite spray welding process method, in particular to a valve disc multi-position plasma stellite spray welding process method, and belongs to the technical field of welding process methods. The method comprises the following steps that firstly, the to-be-spray-welded inner round face, the to-be-spray-welded inner conical face and the to-be-spray-welded outer conical face of a valve disc are subjected to plasma stellite spray welding; secondly, the valve disc is subjected to postwelding stress relief heat treatment for the first time; thirdly, the to-be-spray-welded outer end face, the to-be-spray-welded outer large round face, the to-be-spray-welded outer small round face and the like of the valve disc are subjected to plasma stellite spray welding; and fourthly, the valve disc is subjected to postwelding stress relief heat treatment for the second time. The process flow is simple, the working efficiency can be improved, the production cost is reduced, through reasonable welding and heat treatment process orders and in combination with matched welding process parameters, direct stellite spray welding on all the to-be-spray-welded faces of the valve disc can be performed, welding cracks can be avoided, the toughness of the heat affected zone is good, the weld seam dilution rate is low, and the weld seam pass percent is high.

Description

technical field [0001] The invention relates to a process method of spray welding Stellite alloy, in particular to a process method of plasma spray welding Stellite alloy in multiple parts of a valve disc, belonging to the technical field of welding process methods. Background technique [0002] As the operating temperature of steam turbine valves is getting higher and higher, the corrosion resistance, oxidation resistance, and wear resistance of heat-resistant steel materials under service conditions have been difficult to meet the requirements of use. Among them, for supercritical and ultra-supercritical unit valves, when the valve is opened and closed, multiple parts of the frequently moving valve core need to achieve anti-oxidation, anti-wear, anti-corrosion, and anti-impact properties. In order to reduce costs, Stellite alloying on the valve surface is the most effective and economical way. [0003] However, since the steam turbine valve disc is mainly made of heat-res...

Claims

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Application Information

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IPC IPC(8): B23K10/02
CPCB23K10/027
Inventor 黄岚郭洋范华黄滔李胜刚杨德存陈兴东梁君
Owner DONGFANG TURBINE CO LTD
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