White tungsten electrode also known as pure tungsten electrode, is a welding electrode made of pure tungsten. It has good melt formability and arc stability when welding stainless steel, nickel alloy, aluminum alloy, titanium alloy, and other high-temperature materials. Due to the high melting point and low chemical reactivity of tungsten, the tungsten electrode has high wear resistance and is suitable for welding operations with high temperatures, high strength and high requirements.
1. Feature
1) High purity: Because the scheelite electrode is specially treated and refined, its purity is very high, which can ensure the quality and stability of welding.
2) Magnesium Oxide Doping: The addition of magnesium oxide to scheelite electrodes improves arc stability and helps reduce oxide formation.
3) Wide range of applications: white tungsten electrodes are suitable for direct current welding of stainless steel, nickel alloys, aluminum alloys, titanium alloys, and other materials.
4) Long lifespan: Because scheelite electrodes have a higher melting point and oxidation resistance, their lifespan is longer than other electrodes, which can reduce the frequency of electrode replacement.
5) High welding quality: Due to the better arc stability and oxidation resistance of scheelite electrodes, higher quality welding results can be obtained.
2. White tungsten electrodes are usually improved by using pure tungsten or adding rare earth oxides such as yttrium oxide. Their chemical and physical properties are as follows
1) Chemical properties
- Very corrosion-resistant and resistant to various chemicals.
- Has high thermal stability and discharge capacity.
- It is very pure and does not contain harmful impurities, so it will not pollute the welding workpiece.
2) Physical properties
- High melting point, about 3410 degrees, makes it suitable for welding in high-temperature environment.
- High density, about 19.3 g/cm3, makes it more strong and stable.
- Good electrical and thermal conductivity, making it easier to conduct current stably during welding.
- Very suitable for use in DC welding, but not suitable for AC welding.
3. Technical Data
|
Trade mark |
Added impurity |
Impurity quantity % |
Other impurity |
Electric discharged power |
Color sign |
|
WL10 |
La203 |
0.8~1.2 |
<0.2% |
2.6~2.7 |
black |
|
WL15 |
La203 |
1.3~1.7 |
<0.2% |
2.8~3.0 |
gold |
|
WL20 |
La203 |
1.8~2.2 |
<0.2% |
2.8~3.2 |
Sky blue |
4. The production process usually includes the following steps
1) Raw material selection: choose high-purity tungsten powder as raw material, and usually require the purity of tungsten powder to reach more than 99.95%.
2) Mixing: Mix tungsten powder with appropriate amount of calcium oxide, aluminum oxide and other additives to improve the processing performance of tungsten electrode.
3) Pressing: The mixture is pressed into shape under high pressure, usually by methods such as isostatic pressing or slip casting.
4) Sintering: The pressed tungsten pole is sintered at high temperature to achieve a certain density, hardness and mechanical strength.
5) Tungsten electrode processing: The sintered tungsten electrode is processed, usually by cutting, grinding and polishing methods to meet different process and precision requirements.
6) Inspection and quality control: A series of inspections and quality controls are carried out on tungsten electrodes, such as visual inspection, chemical composition analysis, hardness measurement, etc., to ensure that the product quality meets the requirements.
The above is the basic process of making white tungsten electrodes. In this process, a series of formulas, processes and equipment control are required to ensure stable quality and excellent performance of the final product.
5. Application fields
White tungsten electrode is a general-purpose TIG (argon arc welding) tungsten electrode, which is widely used in the following fields due to some excellent characteristics:
1) Aerospace industry: Scheelite tungsten is used for welding materials in the aerospace industry because of its ability to provide stable and long-lasting performance in high temperature, high pressure, high strength and highly corrosive environments.
2) Chemical industry: Scheelite tungsten electrodes can be used for sealing welding in the chemical industry, as well as operating high temperature and corrosive gases and liquids.
3) Medical equipment industry: scheelite tungsten electrodes are used for argon arc welding to connect stainless steel pipes and storage tanks of medical equipment.
4) Automobile manufacturing industry: scheelite tungsten can be used in stainless steel welding process in automobile manufacturing industry, such as body frame, exhaust pipe, etc.
5) Electronics industry: Scheelite tungsten can be used in micro-welding processes in the electronics industry, such as semiconductor device welding, micro-component assembly, etc.
6. Package & Shipment
White tungsten electrode is usually packed in plastic tubes or cartons to protect from moisture and contamination. During transportation, bumps and extrusions should be avoided to prevent electrodes from being lost or broken. It is recommended to store electrodes separately from other items to avoid wear and cross-contamination. When storing and using tungsten electrodes, relevant safety operating procedures should be followed to ensure the safety of personnel and equipment.
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