Stellite cobalt-based alloy outer circle large-area plasma surfacing method

A cobalt-based alloy and plasma stacking technology, which is applied in the field of ion surfacing, can solve the problems of high labor intensity of welders, long construction period, and low pass rate, and achieve the effects of reduced labor intensity of welders, short construction period, and uniform hardness

Pending Publication Date: 2018-01-19
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Solve the problems of easy cracks, uneven hardness, low pass rate, long construction period, and high labor intensity of welders in large-area cobalt-based alloy surfacing welding

Method used

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  • Stellite cobalt-based alloy outer circle large-area plasma surfacing method
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Embodiment Construction

[0030] Now in conjunction with accompanying drawing, the present invention will be further described:

[0031] As shown in the figure, a large-area plasma overlay welding method for a Stellite cobalt-based alloy outer circle includes the following steps:

[0032] Step S1: forming a cylindrical workpiece to be surfacing by machining;

[0033] Step S2: Cleaning impurities on the surface of the workpiece to be welded, including removing oil, rust, and oxides;

[0034] Step S3: Perform liquid penetrant testing on the surface of the workpiece to be surfacing, if it is unqualified, repair it, if it is qualified,

[0035] Step S4: preheating the workpiece to be surfacing to a specified temperature;

[0036] Step S5: Stellite 12 powder for plasma surfacing cobalt-based alloy;

[0037] Step S6: performing post-heat treatment on the workpiece after surfacing;

[0038] Step S7: Rough machining of the surfacing layer;

[0039] Step S8: liquid penetrant inspection of the surfacing lay...

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Abstract

The invention discloses a Stellite cobalt-based alloy outer circle large-area plasma surfacing method. The method comprises the following steps of S1, forming a cylindrical workpiece to be subjected to surfacing through machining; S2, removing impurities on the to-be-welded surface of the workpiece to be subjected to surfacing, wherein impurity cleaning includes removing greasy dirt, rust and oxide; S3, conducting liquid permeation detection on the surface of the workpiece to be subjected to surfacing, and repairing the workpiece if detection is not passed; S4, preheating the workpiece to be subjected to surfacing to a specified temperature if detection is passed; S5, conducting plasma surfacing on Stellite 12 powder special for a cobalt-based alloy; S6, conducting post-heating treatment on the workpiece subjected to surfacing; S7, conducting rough machining on a surfacing layer; S8, conducting liquid permeation detection on the surfacing layer, and repairing the surfacing layer if detection is not passed; S9, conducting final heat treatment if detection is passed; and S10, conducting finish machining to form a finished product by using a cobalt-based alloy special tool. The Stellite cobalt-based alloy outer circle large-area plasma surfacing method has the beneficial effects that the workpiece subjected to surfacing is free of cracks, uniform in hardness, high in qualified rate and short in construction period, and the labor intensity of welders is relieved.

Description

technical field [0001] The invention belongs to the technical field of plasma surfacing, and specifically relates to a large-area and high-efficiency anti-crack plasma surfacing method for Stellite cobalt-based alloys, which is suitable for surfacing welding of bearings and bushings of high-speed rotary components in power stations. Background technique [0002] Overlay welding is a process in which filler metal is deposited on the surface of the base material by welding to obtain specific surface properties or surface dimensions. Plasma arc surfacing is one of many surfacing methods. It has the characteristics of high plasma arc temperature, concentrated capacity, high heat utilization rate, low dilution rate, open arc, easy control of the shape of the surfacing layer, and smooth forming. It can be used without processing or with less processing. Can be applied to various forms of filling materials. According to the feeding method of filler metal and the type of surfaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K10/02
Inventor 刘金湘孙凡俞增强宋磊陈锐任志华
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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