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Electrode for resistance welding

Resistance welding spot welding, seam welding, projection welding and butt welding all need to use the consumable electrode, although the shape of the electrodes are not identical, however, which is used to weld a transmission welding current and welding stress in the welding process. Some welding, the electrode or welding mold, jig or positioning device. Electrode is resistance welding consumable parts.

Resistance welding electrodes in the working conditions is poor.

In addition to producing the electrode material should have good electrical and thermal conductivity, it should also be able to withstand high temperatures and pressures. The most commonly used resistance welding electrode material is copper and copper alloys, in special welding occasions, also can use the high temperature such as tungsten, molybdenum and alumina powder sintered material as the electrode. In resistance welding, the electrode material and electrode in the shape of a different choice will directly affect the welding quality, production cost and labor productivity.

Resistance welding electrodes for the production of material with the hardness increases, the conductivity is generally lower.

Generally resistant electrode materials with high hardness, compression capability; materials with high electrical conductivity, thermal conductivity is high, heat is also fast. The electrode material is not soft to withstand large welding pressure, but its high conductivity, which can be used in case of high current welding. Low softening temperature heat electrode material is not only a good case for the cooling conditions. In resistance welding, spot welding and seam welding electrodes worst working conditions, so the electrode material is very demanding, both require its electrical conductivity, good thermal conductivity, but also requires heat, pressure and wear.

In contrast, resistance projection welding and welding of the electrode material requirements is much simpler. Resistance welding electrodes is usually part of the clamp, generally do not directly contact with the high temperature zone of weldments, and large contact area with the weldment, the current density is relatively low, the electrode is not required to have a high electrical and thermal conductivity rate, but which in addition to the welding current and welding pieces of transmission forging force, but also to bear a huge clamp pressing force weldment, so that the weld will be strong friction is generated between, Therefore, the electrode must have sufficient strength and hardness in order to reduce the deformation and wear. So to understand the working conditions of the electrode is the key to the correct selection of the electrode material.

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