Silver contacts are widely used in power systems, especially in high-power equipment, silver contacts must be used to conduct current, because silver is the best electrical conductivity in metals, and corrosion resistance and oxidation resistance are strong, the use of power equipment is the best choice.

The only defect is that the price is very expensive, so in general, without affecting the premise of use, the use of welding contacts to repair, with certain economic value.

Contact switch refers to a switch that uses metal contacts to open a circuit, close it, interrupt the current, or make it flow to other circuits. In the field of silver contacts, it is generally divided into pure silver contacts, silver-nickel alloy contacts, silver tin oxide contacts, silver cadmium oxide contacts, etc.

However, the production enterprises and application enterprises that generally have certain planning in the switching profession know how to select the switching silver contacts to ensure the quality and life of the switch, and many small and medium-sized enterprises lack the knowledge about the silver contacts, and the silver cadmium oxide and silver nickel alloy contacts are widely used in the switching profession. But how much do you know about the share and production process?

Silver nickel 10, 12, 15? Or is it silver nickel 20? Is it silver cadmium oxide or silver cadmium? So many switch factories blindly reduce the cost or some small silver point manufacturers with special processes to reduce the cost to make profits, in this small series as a switch person, has the obligation to give us a simple switch occupation popularization, take silver cadmium oxide contacts.

Silver contact

The share can be verified by a third party (metal composition analysis), but it is difficult to control the process, perhaps some silver points do not carry out the oxidation process, it depends on how you choose the silver contact manufacturer.

Silver contact welding operation

1, the mold cover to the contact, if there are uneven should be trimmed flat, must be set, and fixed with refractory mud around the mold cover, must be blocked tightly, especially the groove on the copper surface. Because the mold sleeve is graphite material, it must be lighter, in the welding process, the silver liquid is simply flowing out under the mold sleeve.

2, the beginning of the welding operation, first sprinkle some flux on the silver contact, and heat the copper plate below the silver contact, when the copper plate temperature reaches about 400℃, turn to heat the silver contact surface, when the silver contact surface wrinkles immediately with the silver welding wire stained with flux to the surface of the contact.

Make the welding wire and the silver contact melt at the same time, slowly melt into one, and gradually fill the welding until it is higher than the mold cover, and remove the mold cover after cooling and repair and smooth, the welding repair of this damaged silver contact is completed, and then proceed to the next welding repair.