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A method for plasma spray welding Stellite alloy on valve seat sealing surface

A sealing surface, plasma technology, applied in the direction of plasma welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of easy cracking and poor weldability

Active Publication Date: 2021-06-08
DONGFANG TURBINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The valve seat material of the steam turbine is mainly heat-resistant steel, such as 2Cr12NiMoVNb, F91, F92, which has poor weldability and is easy to crack
Usually, the sealing surface of the valve seat in the high and medium pressure valves of the steam turbine needs to be surfacing with Stellite alloy. Also poor, very easy to crack

Method used

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  • A method for plasma spray welding Stellite alloy on valve seat sealing surface
  • A method for plasma spray welding Stellite alloy on valve seat sealing surface
  • A method for plasma spray welding Stellite alloy on valve seat sealing surface

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Embodiment Construction

[0039] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0040] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0041] A method of plasma spray welding Stellite alloy on the sealing surface of a valve seat of the present embodiment comprises the following steps:

[0042] Step 1. Process the groove on the sealing surface of the valve seat to be spray-welded;

[0043] Step 2. Clean up the groove impurities and perform non-destructive testing on the groove;

[0044] Step 3. Clamp the valve seat on the reversible positioner, and adjust the positioner so that the groove to be sprayed is in a horizontal or approxim...

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Abstract

The invention discloses a method for plasma spray welding Stellite alloy on the sealing surface of a valve seat, and belongs to the technical field of spray welding manufacturing methods for the sealing surface of a valve seat of a steam turbine. A method for plasma spray-welding Stellite alloy on the sealing surface of a valve seat of the present invention comprises: step 1, processing the groove on the sealing surface of the valve seat to be spray-welded; step 2, carrying out non-destructive testing on the groove; step 3, applying The valve seat is clamped on the reversible positioner; step 4, preheat the groove; step 5, use plasma spray welding equipment to spray weld the Stellite alloy on the groove; step 6, spray weld the weld The layer is post-heated, and then slowly cooled to room temperature; step 7, performing post-welding stress relief tempering heat treatment on the valve seat. The invention has simple technological process, does not need to spray weld the austenite transition layer, can directly plasma spray weld the Stellite alloy on the groove of the valve seat sealing surface, has high spray welding efficiency and good weld seam quality.

Description

technical field [0001] The invention relates to a method for plasma spray welding a Stellite alloy on a valve seat sealing surface, and belongs to the technical field of spray welding manufacturing methods for a valve seat sealing surface of a steam turbine. Background technique [0002] The valve seat of the steam turbine is mainly made of heat-resistant steel, such as 2Cr12NiMoVNb, F91, F92, which has poor weldability and is easy to crack. Usually, the sealing surface of the valve seat in the high and medium pressure valves of the steam turbine needs to be surfacing with Stellite alloy. Also poor, easily cracked. [0003] At present, the method of surfacing Stellite alloy usually used on the sealing surface of the valve seat is: first use austenitic welding consumables as a primer on the sealing surface to be surfacing, and then surfacing Stellite alloy. The weldability of the alloy is poor and it is easy to crack, but the Stellite alloy surfacing layer on the sealing su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K10/00B23K10/02
CPCB23K10/00B23K10/02B23K10/027
Inventor 郭洋黄岚黄滔杨德存李胜刚范华陈兴东胡涛马骏
Owner DONGFANG TURBINE CO LTD
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