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The molybdenum spot welding head consists of two pieces of conductive metal with good adhesion. The two metal centers are insulated. As long as there is a touch at the top level, this touch 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, the pressure will increase continuously. When the counter-effect force of the enameled wire to the welding head reaches the set welding pressure, It will trigger a pulse current. The current is very short, usually between a few milliseconds and a dozen milliseconds. The size is about tens to hundreds of times. The current flows from the bottom of the welding head and there is a touch at the top of the welding head. The resistor, in the local area of the touch resistor, generates heat and sparks. This heat can remove the paint strip of the enameled wire and a large amount of heat is transferred to the copper wire inside the enameled wire. Together, a part of the current flows through the bottom end of the soldering tip. When the copper wire of the patent leather is burned off, the copper wire itself is also heated. The copper wire reaches a melting state before the melting point in a short period of time, and under the effect of the pressure, the metal underneath constitutes a new nugget, so that the enameled wire is connected to the metal substrate. Woke up.
Molybdenum has a very low vapor pressure at the degree and pressure of the vacuum furnace operation. Therefore, the molybdenum parts have less pollution to the workpieces or working substances in the furnace, and the transpiration loss must not limit the service life of molybdenum parts such as heating elements and heat insulation encapsulation. The high strength of molybdenum in the production of glassware makes it an ideal electrode and processing and processing equipment for fast addition periods. Molybdenum is chemically compatible with most glass components, and it does not cause harmful color development effects due to the small amount of molybdenum 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, and the technological content of molybdenum products is also continuously improved, and molybdenum products are widely used.
In addition to high strength, good electrical conductivity, thermal conductivity and low coefficient of thermal expansion (similar to glass for tubes), molybdenum and molybdenum alloys have the advantage of being easier to process than tungsten, and thus the boards, strips, foils produced by conventional processing methods. Tubes, rods, wires and profiles in tubes (gates and anodes), electric light sources (supporting materials), metal processing (die-casting and kneading, forging, perforated heads, liquid metal screens) and turbine disks Widely used in components.