Characteristics Analysis of Molybdenum Spot Welding Head

The molybdenum spot welding head is composed of two pieces of conductive metal bonded together. The centers of the two pieces of metal are insulated. As long as there is a contact at the tip, this contact constitutes a small resistance. The bottom of the welding head is flat and lubricated. When operating the machine, when the molybdenum spot welding head is pressed on the enameled wire by pneumatic means or with a foot pedal, the pressure will continue to increase. When the reaction force of the enameled wire on the welding head reaches the set welding pressure, it will Trigger a pulse current, the current time is very short, generally between a few milliseconds to ten milliseconds, about tens to more than one hundred amperes, the current flows from the bottom of the welding head, and there is a contact resistance at the tip of the welding head. The contact resistance will generate heat and sparks, this heat can remove the varnish of the enameled wire and a large amount of the heat will be transferred to the copper wire inside the enameled wire superior, a part of the current will from the bottom end of the welding head through the burned-out copper wire, the copper wire itself also heating, the copper wire in a short period of time before the temperature reaches the melting point of the melting state, under the action of pressure and metal underneath to from a new nugget, so that the enameled wire is connected with the metal.

Molybdenum has an extremely low vapor pressure under the pressure of a vacuum furnace. Therefore, molybdenum parts have less pollution to workpieces or working substances in the furnace, and transpiration loss must not be restricted, such as the service life of molybdenum parts with high quality such as heating elements. Molybdenum is chemically compatible with most glass components, and it will not form harmful coloring effects due to a small amount of molybdenum dissolved in the glass bath, As a heating electrode in a glass smelting furnace, its span can be as long as 3 to 5 years, the technological content of molybdenum products is also continuously improved, and molybdenum products are widely used.

Molybdenum and molybdenum alloys have the advantages of high strength, good electrical conductivity, thermal conductivity and low thermal expansion coefficient( similar to tube glass), and easy processing. Therefore, plates, belts, foils, tubes, rods, wires and profiles produced by conventional processing methods are used in electronic tubes( gird and anode), electric light source (supporting materials) parts, metal processing( die casting and kneading die, forging die, perforated head liquid metal filter screen) and turbine disc and other components are widely used.

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