Tungsten needle is a kind of tungsten product with slender structure, which is made of pure tungsten or tungsten alloy. It has the advantages of high temperature resistance, high hardness, conductivity and so on. It is often used as electrode material in argon arc welding technology. China Tungsten online provides high quality tungsten needle products.
Argon arc welding, also known as argon gas shielded welding, is a welding technology using argon as the shielding gas to isolate air, which can prevent the oxidation of welding area. Argon arc welding is a kind of tungsten inert gas welding. It can weld stainless steel, high temperature alloy, titanium alloy, aluminum alloy and other materials. It is used in nuclear energy, aerospace, shipbuilding, electronics, metallurgy and other industries.
There are many kinds of tungsten electrodes, such as cerium tungsten electrode, thorium tungsten electrode, lanthanum tungsten electrode, zirconium tungsten electrode, pure tungsten electrode, yttrium tungsten electrode and composite tungsten electrode. Rare earth elements passing through tungsten electrode belong to trace elements, so it is difficult to judge the type of tungsten electrode only by naked eyes. The way to distinguish these tungsten electrodes on the market is to identify the color of the tungsten electrode head.
Application and selection of tungsten needle in argon arc welding
Cerium tungsten electrode
Cerium tungsten electrode is a green environmental protection product without radioactive pollution. It can easily start arc with a very small current, and the dimension arc current is also small. Under the condition of low current direct current, Ce-W electrode is very popular, especially for the welding of pipes and small parts, intermittent welding and a certain number of welding.
Thorium tungsten electrode
Thorium tungsten electrode is the most widely used tungsten electrode in the United States and other countries at present because of its excellent comprehensive performance, especially its ability to withstand overload current. However, due to the existence of slight radioactive pollution, its application in some aspects is limited. Thorium tungsten electrode is usually used for DC welding of carbon steel, stainless steel, nickel alloy and titanium metal.
Lanthanum tungsten electrode
Lanthanum tungsten electrode has excellent welding performance, and its conductivity is close to 2% thorium tungsten electrode, and there is no radioactive hazard. Welders can replace thorium tungsten electrode conveniently and quickly without changing any welding operation procedures. Therefore, lanthanum tungsten electrode has become the most popular substitute of 2% thorium tungsten electrode in Europe and Japan. Lanthanum tungsten electrode is mainly used in DC welding, but it also performs well in AC welding.
Zirconium tungsten electrode
Zirconium tungsten electrode behaves well under AC condition. When welding, its end can keep ball shape and arc is more stable than pure tungsten electrode. Especially under high load condition, its superior performance is irreplaceable by other electrodes. Zirconium tungsten electrode also has good corrosion resistance. Zirconium tungsten electrode is suitable for AC welding of magnesium aluminum and its alloy.
Pure tungsten electrode
The pure tungsten electrode is the cheapest of all tungsten electrodes, which is suitable for the welding of magnesium, aluminum and their alloys under AC condition.
Yttrium tungsten electrode
The yttrium tungsten electrode is mainly used in military industry and aerospace industry at present, because of its long and thin arc beam, high compression degree, especially in medium and large current penetration.
Composite electrode
Two or more kinds of rare earth oxides are added to the tungsten composite electrode, each of which is complementary to each other to make its welding performance better.
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