In the resistance welding process, the components to be joined are compressed together and heated through the application of electric current until a molten pool forms at various points between them. This process requires high current and high pressure.

When welding thick plates, the force between the electrode and the components to be joined can reach up to 450 megapascals. This poses a significant challenge for welding electrodes that must withstand these loads.

We employ welding electrodes made of materials such as tungsten-copper, which are particularly suitable for welding highly conductive materials like copper. They can be used for the following processes: spot welding, seam welding, projection welding, and upset welding.
 

Description of Tungsten Copper Resistance Welding Electrodes

RWMA CLASS 10 copper tungsten material is used for flash and butt welding electrodes, suitable for applications requiring high heat resistance, relatively high electrical and thermal conductivity, high ductility, and low thermal expansion. This material is composed of 45% copper and 55% tungsten, forming a dense, hard metal with excellent wear resistance and strength.

RWMA CLASS 11 copper tungsten material contains 25% copper and 75% tungsten. Similar to class 10, it exhibits excellent wear resistance and strength, and good thermal and electrical conductivity. However, it is harder than class 10 and is suitable for applications requiring moderate pressure. Common applications include projection welding electrodes, flash and butt welding electrodes, slight upset and upset welding sleeves, and spot welding low-conductivity steels. It is also widely used in frames for chip carriers, substrates, flanges, and power semiconductor devices.

RWMA CLASS 12 copper tungsten material contains 20% copper and 80% tungsten. It has higher hardness compared to class 10 and 11 copper tungsten and is typically used for heavy-duty projection welding electrodes, electroplating and forging electrode faces for stamping screws and rivets, and cross-wire welding. It is also used as a liner material for special-shaped explosive charges used in defense and the oil and gas industry.
 

Features of Tungsten Copper Resistance Welding Electrodes

1. Long service life greatly improves production efficiency.
2. Uniform internal structure with no cracks, ensuring even thermal and electrical conductivity.
3. Consistent resistance during welding, no need for adjustment.
 

Grades of Tungsten Copper Resistance Welding Electrodes