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The molybdenum spot welding head is composed of two pieces of metal with good conductive function. The center of the two pieces of metal is insulated. As long as there is a contact at the top, this contact constitutes a small resistance. It is flat and smooth. When operating the machine, when the molybdenum spot welding head is pressed on the enameled wire by pneumatic method or by foot, the pressure will increase continuously. When the reaction force of the enameled wire to the welding head reaches the set welding pressure, A pulse current will be triggered. The time of the current is very short, generally between a few milliseconds and a dozen milliseconds, and the size is about several tens to a hundred amps. The current flows through the bottom of the welding head, and there is a contact at the top of the welding head. Resistance, where the resistance is contacted, it will generate heat and spark. This heat can remove the varnish of the enameled wire and a lot of heat will be transferred to the copper wire inside the enameled wire. Together, a part of the current will flow through the bottom of the welding head. The copper wire of the varnish is burned out, and the copper wire itself is also heating. The copper wire melts before the temperature reaches the melting point in a short period of time. Under the effect of pressure, the metal underneath forms a new nugget. In this way, the enameled wire is connected to the metal substrate. Woke up.
Molybdenum has extremely low vapor pressure under the degree and pressure of the vacuum furnace. Therefore, molybdenum parts have less pollution to the workpiece or working material in the furnace, and the evaporation loss will not limit the service life of high molybdenum parts such as heating elements and heat insulation packaging. The high strength of molybdenum in making glass products makes it a more ambitious electrode and processing and processing equipment during rapid addition. Molybdenum is chemically compatible with most glass components, and it does not cause harmful coloring effects because a small amount of molybdenum is dissolved in the glass melting tank. As a heating electrode in a glass melting furnace, its life can be as long as 3-5 years. However, the technology content of molybdenum products has also been continuously improved, and molybdenum products are widely used.
Molybdenum and molybdenum alloys have the advantage of being easier to process than tungsten in addition to high strength, good electrical conductivity, thermal conductivity, and low coefficient of thermal expansion (similar to glass for electronic tubes). Therefore, plates, strips, foils, Tubes, rods, wires, and profiles are used in electronic tubes (grids and anodes), electric light sources (supporting materials) parts, metal processing items (die-casting and extrusion dies, forging dies, perforated heads, liquid metal screens) and turbine disks, etc. Widely used in components.