1) pure copper
Pure copper industry pure copper, the copper content above 99.9%, density 8.9g/cm3 melting point of 1083 ℃, has excellent electrical conductivity,

The thermal conductivity is the most important electric and thermal conductivity material. Pure copper in the annealed state high plasticity and low strength, it is suitable for a variety of cold

Thermal processing. Cold working to improve the strength and hardness of copper to reduce plastic is very small, while on the electrical conductivity of pure copper

A feature making it one of the  Welding Electrodes pure aluminum electrode material.
 
Cold hardening copper will reduce the recrystallization temperature, so the pure copper Carbon Steel Electrode is not higher than 150 ° C, otherwise it would be copper Motion

Speed ??to soften the impact of the welding quality.
In short, the pure copper electrode is only applicable to small pressure, welding bulk is not the case of low temperature and products.
2) cadmium copper
Cadmium copper is the most important of the electrode in the copper alloy material, Cd0.7% ~ 1.0%, belongs to the heat treatment to strengthen the alloy by cold work hard

Technology to improve its hardness up to 140HV. Cadmium copper has good electrical conductivity, thermal conductivity and wear and corrosion resistance of cold hardening

Recrystallization temperature is low, it is only suitable for use, and the need to strengthen the welding electrode cooling below 200 ℃, to improve its

Service life.
3), Cr, Cu
Chromium copper has high strength and high conductivity characteristics, the most widely used, Cr0.5% ~ 1.0%, the conductivity of up to 80% of pure copper ~~

90% belong to the heat treatment to strengthen the alloy. Dispersion to form precipitates in the intergranular chromium after heat treatment to be strengthened so that the matrix

And conductivity increase. If more after cold working, and its mechanical properties will be further improved. Cr, Cu, higher softening temperature, with good

Heat resistance, safety at work in the high temperature of 450 ~ 477 ℃, but the use of temperature still prevent more than the softening temperature of the chromium copper and

Enhance cooling.
Cr, Cu, adding a small amount of silver, aluminum, magnesium and silicon and other elements to form a multi-copper alloy, such as chrome silver copper and chromium aluminum-magnesium copper, etc., can be

To further improve the mechanical properties and softening temperature.
4) zirconium copper
Zirconium copper is a high conductivity, high thermal conductivity, heat treatment to strengthen the alloy. The copper zirconium can significantly improve the mechanical properties of copper and

Softening temperature, the zirconium copper alloy Zr0.2%, and Zr0.4% two kinds. Zirconium copper after solution treatment and a certain degree of cold.

The work reaging strengthening after high mechanical properties and softening temperature. The use of performance superior to chromium copper and chromium zirconium copper, zirconium price

Expensive than chrome, higher manufacturing costs.
5) chromium zirconium copper
Chromium zirconium copper is high strength, high conductivity of heat treatment to strengthen the best performance in the copper alloys, both high Cr, Cu, failure to strengthen

Can the advantages of high softening temperature of copper and zirconium, and thus have a higher hardness at normal and high temperatures. Cr0.25% ~

0.80%, Zr0.08% ~ 0.50%, also contains small amounts of Mg. After solid solution and the failure of the heat treatment, the uniform precipitation of the copper matrix Mi

The bulk of Cr and CuZr particles, to improve its performance. Adding a small amount of Mg is in order to improve its thermal stability.
Practice shows that the welding electrode for welding low carbon steel or coated steel, electrode life than chrome aluminum-magnesium copper electrode mention made of chromium zirconium copper

High 5 to 10 times.
6) beryllium copper
Beryllium copper is a copper alloy strength and hardness of the highest kind, Be2.0%. Beryllium-copper solid solution and aging heat treatment, its strength and resistance

The grindability reach the level of high-strength alloy steel. Beryllium copper conductivity and softening temperature is low, use the temperature exceeds 550 ℃, then

Complete softening, and therefore does not apply to the small contact area, welding high surface temperature of the spot welding or seam welding electrode, otherwise they will be conductive,

The low thermal conductivity caused by severe adhesion.
7) beryllium, cobalt and copper
Beryllium, cobalt and copper is a high strength, medium conductivity electrode copper alloy a Be0.4% to 0.7%, Co2.0% to 2.8%, is a heat treatment Strong

Of the alloy. Beryllium and cobalt can form complexes of high melting point metal of high hardness Shaohua, to significantly improve the strength of copper, cobalt can

Alloy precipitation hardening effect.
8) nickel-silicon-copper
Nickel-silicon-copper is a heat treatment to strengthen alloy with high strength and hardness, good abrasion resistance, alternative to beryllium copper electrode

Material, usually Ni2.4% to 3.4%, Si0.6% to 1.1%. During heat treatment, the alloy of nickel and silicon can form intermetallic compounds and was

Dispersion phase, so that the matrix to be reinforced, so the higher its mechanical properties and electrical conductivity.
Table 8 shows the characteristics and performance of the resistance welding with the commonly used copper and copper alloy electrodes.