Welding method for conducting build up welding through stellite alloy

A welding method and special alloy technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problem of easy crack or brittle crack, avoid crack or brittle crack, long service life, reduce stress and strain rate. Effect

Inactive Publication Date: 2015-12-23
WUHAN MARINE MACHINERY PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the surfacing welding method in the prior art is prone to cracks or brittle cracks, the embodiment of the present invention provides a welding method using stellite alloy for surfacing welding

Method used

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  • Welding method for conducting build up welding through stellite alloy

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Embodiment

[0025] The embodiment of the present invention provides a welding method using stellite alloy for surfacing welding, which is suitable for surfacing welding of stellite hard alloy layer of gas turbine front casing, such as figure 1 Shown method flowchart, this method comprises:

[0026] Step 1: Preheat the surfacing welding workpiece. The preheating temperature is 350°C-400°C. When the surfacing welding workpiece reaches the preheating temperature, perform the first heat preservation.

[0027] Step 2: Use welding wire and manual argon tungsten arc welding for the surfacing workpiece after heat preservation, so that the welding wire forms a surfacing layer on the surfacing workpiece, and ensure that the temperature of the surfacing workpiece is 200 during welding. ℃-300℃, the welding wire is stellite alloy, and the composition of the welding wire includes: carbon, chromium, tungsten, silicon, manganese, iron, nickel and cobalt, the weight part of carbon is 0.9-1.4 parts, and th...

Embodiment 1

[0041] Specifically, the thickness of the surfacing welding workpiece is 25 mm, and the thickness of the surfacing welding layer is 3 mm.

[0042] Step 1: Preheat the surfacing workpiece. The preheating temperature is 350°C. When the surfacing workpiece reaches the preheating temperature, perform the first heat preservation. The first heat preservation time is 0.5h.

[0043] Step 2: Use welding wire and manual argon tungsten arc welding for the surfacing workpiece after heat preservation, so that the welding wire forms a surfacing layer on the surfacing workpiece, and ensure that the temperature of the surfacing workpiece is 200 during welding. ℃, the welding wire is stellite alloy, and the composition of the welding wire includes: carbon, chromium, tungsten, silicon, manganese, iron, nickel and cobalt, the weight part of carbon is 0.9 parts, the weight part of chromium is 26.0 parts, and the weight part of tungsten Parts by weight are 3.0 parts, parts by weight of silicon ≤ 2...

Embodiment 2

[0052] Embodiment two adopts the processing method identical with embodiment one, and method difference is as follows:

[0053] Specifically, the thickness of the surfacing welding workpiece is 45 mm, and the thickness of the surfacing welding layer is 6 mm.

[0054] Step 1: Preheat the surfacing workpiece. The preheating temperature is 400°C. When the surfacing workpiece reaches the preheating temperature, perform the first heat preservation. The time of the first heat preservation is 1.5h.

[0055] Step 2: Use welding wire and manual tungsten argon arc welding for the surfacing workpiece after heat preservation, so that the welding wire forms a surfacing layer on the surfacing workpiece, and ensure that the temperature of the surfacing workpiece is 300 during welding. ℃, the welding wire is stellite alloy, and the composition of the welding wire includes: carbon, chromium, tungsten, silicon, manganese, iron, nickel and cobalt, the weight part of carbon is 1.4 parts, the weig...

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Abstract

The invention discloses a welding method for conducting build up welding through stellite alloy, and belongs to the field of welding. The method includes the steps that the first time of heat preservation is conducted after a build up welded workpiece is preheated; build up welding is conducted through a welding wire and manual argon tungsten-arc welding by means of the build up welded workpiece after the first time of heat preservation so that the welding wire can form a build up welded layer at the weld joint of the build up welded workpiece, wherein it is ensured that the build up welded workpiece is 200 DEG C to 300 DEG C in the build up welding process, and the welding wire is made of stellite alloy; after welding is completed, thermal treatment is conducted on the build up welded workpiece, wherein the initial temperature of thermal treatment is 200 DEG C to 300 DEG C, and the second time of heat preservation is conducted after the initial temperature of thermal treatment is raised to 850-870 DEG C at the speed of 80 DEG C per hour; and cooing is conducted. According to the method, the build up welded workpiece is preheated, the cooling speed of the weld joint can be decreased through preheating, the welded build up welded workpiece can be slowly cooled, a product is prevented from generating welding cracks especially cold cracks, and meanwhile it can be ensured that the build up welded layer has high strength.

Description

technical field [0001] The invention relates to the field of welding, in particular to a welding method using stellite alloy for overlay welding. Background technique [0002] Stellite alloy is a hard alloy resistant to various types of wear and corrosion and high temperature oxidation, which is commonly referred to as cobalt alloy. Stellite alloy has high dimensional stability, wear resistance, corrosion resistance and oxidation resistance, and is usually used as a surfacing layer to increase the wear resistance and corrosion resistance of products. [0003] At present, when using stellite alloy as welding wire for surfacing welding, the surfacing welding workpiece is surfacing welding without preheating. Since the surfacing welding workpiece is not preheated during welding, the temperature difference between the welding area and the surfacing welding workpiece is large. The welding cooling speed is fast, and the fast cooling speed will cause the structure and grain of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/167B23K35/30
CPCB23K9/04B23K9/167B23K35/3046
Inventor 吴勇杨新明黄立群徐黎明熊亚东
Owner WUHAN MARINE MACHINERY PLANT
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