Premium M12 & M20 Brass Weld Stud Bolts with Nuts Washers Metal Fastening Offered in Sizes T1 T2 T3

Premium M12 & M20 Brass Weld Stud Bolts with Nuts Washers Metal Fastening Offered in Sizes T1 T2 T3
 
Product Description:

Stud welding is the stud end and plate (or pipe fittings) surface contact, electric arc, to be melted on the contact surface, give the stud a certain pressure to complete the welding method. Arc stud welding with cylindrical head studs are suitable for high-rise steel structure buildings, industrial plant buildings, highways, railways, bridges, pylons, automobiles, energy, transport facilities buildings, airports, stations, power stations, pipeline supports, cranes and other steel structures.

Stud welding is a method of welding metal studs or other fasteners to a workpiece. There are various methods to achieve stud welding, such as: arc welding stud welding, energy storage stud welding, resistance welding, projection welding and so on. The corresponding welding machine is also different, respectively, for the arc stud welding machine, energy storage stud welding machine, resistance welding machine, convex welding machine. 

Stud welder in China has a variety of informal terminology, such as seed welder, plant welder, seed nail machine, plant nail machine, screw welder, screw welder, and so on, are referred to the stud welder.

Capacitor discharge stud welder adopts large capacity capacitor as the source of welding energy, and precisely controls the discharge time by SCR, which melts the tip of the stud quickly by instantaneous low voltage and strong current, and makes the stud and the working surface gap merge quickly, and welds the stud firmly on the working surface, and the whole process lasts about 1-10ms.

Applications

Pure copper is a rose-red metal, the surface of the formation of copper oxide film is purple, so the industrial pure copper is often called copper or electrolytic copper. Density of 8-9g/cm3, melting point 1083 ° C. Pure copper conductivity is very good, a large number of wires, cables, brushes, etc.; good thermal conductivity, often used to manufacture magnetic instruments, instruments, such as compasses, aeronautical instrumentation, etc. to prevent magnetic interference; plasticity is very good, easy to hot and cold pressure processing, can be made into tubes, rods, wires, strips, strips, panels, foils and other copper materials.

(T1, T2, T3), oxygen-free copper (oxygen-free copper, silver oxygen-free copper, zirconium oxygen-free copper and diffuse oxygen-free copper), phosphorus deoxygenated copper, add a small amount of alloying elements of special copper (copper arsenic, tellurium copper, silver copper, copper sulphur and zirconium copper) four categories. Copper conductivity and thermal conductivity second only to silver, widely used in the production of electrical and thermal conductivity equipment. Copper in the atmosphere, seawater and some non-oxidising acids (hydrochloric acid, dilute sulfuric acid), alkalis, salt solutions and a variety of organic acids (acetic acid, citric acid), has good corrosion resistance, used in the chemical industry. In addition, copper has good weldability, can be cold, thermoplastic processing into a variety of semi-finished products and finished products. 1970s, the production of copper exceeded the total output of other types of copper alloys.
 

Theoretical value of pure copper resistivity If the various materials made of 1 m long, cross-sectional area of 1 square millimetre wire, at 20 ℃ to measure their resistance (known as the resistivity of this material) and compare, the silver resistivity is the smallest, followed by copper, aluminium, tungsten, iron, manganese-copper, nickel-chromium alloys in the order of the resistivity in order to increase.
The resistivity of aluminium wire is more than 1.5 times that of copper wire, which has a resistivity of p=0.0294 Ωmm2/m, and that of copper, which has a resistivity of p=0.01851 Ω-mm2/m, and the resistivity varies somewhat with temperature

The use of pure copper is much wider than the range of iron, a large amount of copper is used in the production of electrical industry every year. Pure copper is mainly used for the production of generators, bus bars, cables, switchgear, transformers and other electrical equipment and heat exchangers, pipelines, solar heating devices such as flat plate collectors and other heat-conducting equipment. Oxygen in copper (copper refining is easy to mix a small amount of oxygen) on the conductivity has a great impact on the electrical industry for the copper generally must be oxygen-free copper. Pure copper is also mainly used for motor short-circuit ring, electromagnetic heating inductor production, and high-power electronic components, such as wiring harness terminals. Pure copper is also used in doors, windows, handrails and other furniture and decoration.

 
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