อิเล็กโทรดทังสเตนสำหรับการเชื่อม TIG

อิเล็กโทรดทังสเตนสำหรับการเชื่อม TIG

Tungsten electrodes are used in TIG welding. They are made by powder metallurgically doping a tungsten matrix with approximately 0.3%-5% of rare earth elements such as cerium, thorium, lanthanum, zirconium, and yttrium. These electrodes are then press-formed into a tungsten alloy. Diameters range from 0.25 to 6.4 mm, and standard lengths range from 75 to 600 mm. Diameters of 1.0, 1.6, 2.4, and 3.2 mm are the most commonly used. The shape of the electrode tip is crucial for TIG welding. When using DCSP, the tip must be ground to a point, and the tip angle varies depending on the application, electrode diameter, and welding current. Narrow joints require a smaller tip angle. When welding very thin materials, a low-current, needle-shaped, minimal electrode is required to stabilize the arc. A properly grounded electrode ensures easy arc ignition, good arc stability, and an appropriate weld bead width. When welding with an AC power source, grinding the electrode tip is unnecessary. With the proper welding current, the electrode tip forms a hemispherical shape. If the welding current is increased, the electrode tip will become bulb-shaped and may melt, contaminating the molten metal.

 

With the development and expanded application of tungsten electrode inert gas welding, research on tungsten electrodes has become increasingly in-depth. Thoriated tungsten electrodes were previously used in plasma arc welding, cutting, and non-melting electrode argon arc welding. However, due to the radioactivity of thorium (its radiation dose reaches 3.60×10 Curies/kg), which can harm human health and pollute the environment, cerium tungsten electrodes with a cerium oxide content of 2-4% have been used instead. In direct current argon arc welding, cerium tungsten electrodes are easier to start, have less electrode burnout, and allow for higher welding current densities than thorium tungsten electrodes. However, in AC argon arc welding, cerium tungsten electrodes experience greater burnout than thorium tungsten electrodes, and the welding current range for cerium tungsten electrodes is smaller than that for thorium tungsten electrodes. Thoriated tungsten electrodes are easy to use and perform well even under high current loads. Many people still use this material, considering it an integral part of high-quality welding. However, attention is gradually shifting to other types of tungsten electrodes, such as cerium tungsten and lanthanum tungsten. Because the thorium oxide in thoriated tungsten electrodes emits trace amounts of radiation, some welders are reluctant to work with them.

 

Tungsten electrodes are mainly classified as follows:

1. Cerium tungsten electrodes

 

 

Brand	color	ผลิตภัณฑ์	advantage	แอปพลิเคชัน
WC20	grey		Non-radiative Low melting rate Long life Good arc starting	Low current DC welding

 

1. Lanthanum tungsten electrode

Brand	color	ผลิตภัณฑ์	advantage
WL10	Black Golden Yellow Sky Blue	Improved mechanical cutting   performance Improved creep resistance   Higher recrystallization temperature   Good ductility	AC welding tasks
WL15
WL20

3. Thoriated tungsten electrode

 

 

 

 

 

 

 

 

 

 

Brand	color	ผลิตภัณฑ์	advantage	แอปพลิเคชัน
WT10	Yellow   Red Purple		Lower electronic performance   Higher crystallization temperature   Better electrical conductivity   Excellent mechanical cutting performance	Widely used in DC welding field
WT20
WT30 WT40	orange

4. Zirconium tungsten electrode

Brand	color	ผลิตภัณฑ์	advantage	แอปพลิเคชัน
WZ3	Brown   White		Zirconium-tungsten electrodes offer excellent welding performance in AC environments.   Especially at high load currents, the superior performance demonstrated by zirconium-tungsten electrodes is irreplaceable compared to other electrodes.	AC welding tasks
WZ8

 

 

 

 

 

 

5. Yttrium tungsten electrode

Brand	color	ผลิตภัณฑ์	advantage	แอปพลิเคชัน
WY	blue		During welding, the arc beam is slender and highly compressed, and its penetration depth is relatively large at medium and high currents.	Mainly used in military industry and aerospace industry

การประยุกต์ใช้ผลิตภัณฑ์

 

Argon arc welding, also known as argon gas shielded welding, involves the use of a protective gas atmosphere around the arc welding process, isolating the air from the weld zone and preventing oxidation. Based on the principles of conventional arc welding, argon arc welding utilizes the protection of argon gas to melt the metal consumables into a liquid form on the substrate being welded, using a high current to form a molten pool. This creates a metallurgical bond between the two metals. The continuous flow of argon gas during high-temperature molten welding isolates the consumables from oxygen in the air, thus preventing oxidation. This allows welding of non-ferrous metals such as copper, aluminum, and alloy steel.

 

• Thorium tungsten electrodes are commonly used for DC welding of carbon steel, stainless steel, nickel alloys, and titanium.
• Lanthanum tungsten electrodes are primarily used for DC welding, but also perform well in AC welding.
• Pure tungsten electrodes are suitable for welding magnesium, aluminum, and their alloys under AC conditions.
• Yttrium tungsten electrodes are currently primarily used in the military and aerospace industries.
• Zirconium tungsten electrodes are suitable for AC welding of magnesium, aluminum, and their alloys.

 

ข้อมูลจำเพาะของผลิตภัณฑ์

Electrode diameter specifications are selected based on welding current.

Diameter 0.5-50mm, length 150mm/175mm/178mm, customer-specified length available.