Tube Mineral Mining Equipment

high frequency welding machine when the frequency of welding have a great impact, because the high frequency current in the steel affect the internal distribution of. Used for welding of high and low frequency effects are mainly the size of the weld heat affected zone. From the welding efficiency, it should maximize the use of higher frequency. 100KHz high frequency currents penetrate ferritic steel 0.1mm, 400KHz can only penetrate 0.04mm, that is, the surface of the sheet current density distribution, which is nearly 2.5 times higher than the former. In production practice, welding carbon steel materials generally select 350KHz ~ 450KHz frequency; welding alloy steel, welded steel plate 10mm thick over time, as can be 50KHz ~ 150KHz low frequency, because the alloy contained within chromium, zinc, copper, aluminum and other elements of the skin effect and steel are some differences. Foreign high-frequency equipment manufacturers are now mostly used solid-state high frequency of new technology, it set a frequency range, in the thickness of the material during welding, machine speed, etc. automatic tracking adjustment frequency.
Second, the join angle
Convergence angle is squeezed into the Ministry of Steel both sides of the point angle. As the role of proximity effect, when the high-frequency current through the plate edge, the edge will form a preheating plate and melting (also known as lintels), this segment is too intense beam heating, the house was quickly vaporized and molten steel blasting splashes out to form a flash, the size of the convergence angle has a direct impact melting.
Angle-hour rendezvous significant proximity effect is conducive to enhancing Eye Massager speed, but the angle is too small to join, preheating and melting variable length, and melting the result of variable length, making the flash process unstable slope lintel after explosion easy to form pits and pinholes, hardly pressing.
Convergence angle is too large, the melting shorter, flash and stability, but reduced proximity effect, the welding efficiency decreased, power consumption increases. When molding thin-walled steel pipe in the same time, too much angle will join the edges of elongated tube, resulting in wavy folds. Current production, we generally 2 ° - 6 ° angle of convergence within the regulation, faster production sheet metal, extrusion molding, use a smaller angle of convergence; production plate when the speed is slow, when to use extruded join a larger angle. Manufacturers have proposed an empirical formula: join angle × unit speed ? 100, for reference.
Third, the welding