Method for welding molybdenum alloy

A welding method and technology of molybdenum alloy, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of molybdenum alloy becoming brittle, molybdenum intergranular brittle fracture, reducing molybdenum bonding strength, etc., to reduce moisture and refine grain Granules, the effect of reducing sensitivity

Active Publication Date: 2017-06-20
宝鸡市蕴杰金属制品有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molybdenum alloys are easy to oxidize, and even a very small amount of oxygen atoms can easily form M in molybdenum O o 2 , and segregated on the grain boundary in the form of a monolayer, which significantly reduces the bonding strength of molybdenum at the grain boundary, resulting in intergranular brittle fracture of molybdenum
The welding material itself is easy to contain high-valent oxides and moisture, and the weld metal of the molybdenum alloy will react with oxygen at high temperature during the welding process to form M O o 2 During the cooling process, it reacts with hydrogen dissolved in the metal to form water vapor, and reacts with carbon dissolved in the metal to form carbon monoxide. During crystallization, these gases often have no time to escape and form pores, causing the molybdenum alloy to become brittle

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  • Method for welding molybdenum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A welding method for molybdenum alloys, comprising the steps of:

[0026] (1) Clean the molybdenum alloy welding area to remove the oxide film and oil stains on the surface of the molybdenum alloy. Wash in water and remove acetone residues on the surface of the workpiece; soak the cleaned workpiece in a mixed solution consisting of 2% hydrofluoric acid alcohol solution and 8% nitric acid solution for 7 minutes, then take out the parts and put them in water Clean and remove the residue of the mixed solution on the surface of the workpiece, and then put the molybdenum alloy workpiece into a vacuum drying oven for drying. The drying temperature is controlled at 80°C for 10 minutes;

[0027] (2) Making special welding wire for molybdenum alloy, which is mainly made of the following raw materials in weight percentage: 20% nickel, 12% chromium, 0.5% aluminum, 2.5% manganese, 0.03% niobium, 0.03% carbon, silicon 0.2%, titanium 0.6%, phosphorus 0.005% and the rest of molybdenu...

Embodiment 2

[0033]A welding method for molybdenum alloys, comprising the steps of:

[0034] (1) Clean the molybdenum alloy welding area to remove the oxide film and oil stains on the surface of the molybdenum alloy. Wash in water and remove acetone residues on the surface of the workpiece; soak the cleaned workpiece in a mixed solution consisting of 5% hydrofluoric acid alcohol solution and 15% nitric acid solution for 10 minutes, then take out the parts and put them in water Clean and remove the residue of the mixed solution on the surface of the workpiece, and then put the molybdenum alloy workpiece into a vacuum drying oven for drying. The drying temperature is controlled at 150°C for 25 minutes;

[0035] (2) Making special welding wire for molybdenum alloy, which is mainly made of the following raw materials in weight percentage: 32% nickel, 19% chromium, 1.2% aluminum, 9.5% manganese, 0.09% niobium, 0.1% carbon, silicon 1.1%, titanium 1.3%, phosphorus 0.015% and the rest of molybden...

Embodiment 3

[0041] A welding method for molybdenum alloys, comprising the steps of:

[0042] (1) Clean the molybdenum alloy welding area to remove the oxide film and oil stains on the surface of the molybdenum alloy. Wash in water and remove acetone residues on the surface of the workpiece; soak the cleaned workpiece in a mixed solution consisting of 2% hydrofluoric acid alcohol solution and 8% nitric acid solution for 7 minutes, then take out the parts and put them in water Clean and remove the residue of the mixed solution on the surface of the workpiece, and then put the molybdenum alloy workpiece into a vacuum drying oven for drying. The drying temperature is controlled at 80°C for 10 minutes;

[0043] (2) Making special welding wire for molybdenum alloy, which is mainly made of the following raw materials in weight percentage: 30% nickel, 18% chromium, 1.1% aluminum, 8.5% manganese, 0.04% niobium, 0.04% carbon, silicon 0.3%, titanium 0.7%, phosphorus 0.006% and the rest of molybdenu...

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Abstract

The invention discloses a method for welding molybdenum alloy, belonging to the technical field of metal welding. The method comprises the steps: (1) after cleaning, drying the welding area of molybdenum alloy; (2) manufacturing a special welding wire for the molybdenum alloy; (3) degassing at high temperature; (4) taking out a molybdenum alloy workpiece, spraying an active agent until the thickness is 0.2-0.8mm on the he welding area of molybdenum alloy, heating the special welding wire for the molybdenum alloy to dry, and then welding the molybdenum alloy workpiece, wherein the welding method adopts TIG wire filling welding, adopts a direct-current straight polarity power supply and determines welding process parameters; (5) cooling; (6) inspection. The method can reduce the quantity of joint holes, improve weldability, reduce cracks, refine parent crystalline grains so as to improve the tensile property of welded joints, and obtain good welding quality.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and in particular relates to a molybdenum alloy welding method. Background technique [0002] Molybdenum alloy has the characteristics of high melting point, good high temperature performance, good thermal and electrical conductivity, small expansion coefficient, good thermal shock resistance, strong wear resistance and corrosion resistance, high sound velocity, etc., making it widely used in chemistry, metallurgy and metal processing, It has been widely used in electronics industry, aerospace and nuclear industry, military and other fields, and it is one of the refractory metal materials with very promising application prospects. With the further research on molybdenum alloy and its wider application in various fields, it is particularly important and urgent to carry out research work on molybdenum alloy welding technology. Improving the weldability of molybdenum alloy and obtaining high-q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/235B23K35/30B23K35/12
CPCB23K9/167B23K9/235B23K35/0261B23K35/304B23K2103/08
Inventor 陈剑飞
Owner 宝鸡市蕴杰金属制品有限公司
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