What are the advantages of an intermediate frequency spot welder?
Compared with the common resistance welding machine, the common problem of conventional resistance welding is the instability of welding quality. Spatter during welding. Lack of effective data monitoring for welding quality. Excessive wear of electrodes. The power factor is low, and a large number of capacitor compensation cabinets are added to improve the power factor. Excessive energy costs. AC welding, two times output, strong magnetic field influence on human health. Welding faces the challenge of high strength steel plates. Welding process of galvanized steel sheet and multilayer steel plate. Application of aluminum alloy sheet material. The widespread use of automatic flexible production line for welding robot. Continuously reduce energy costs, quality costs, and maintenance costs
Advantages of intermediate frequency spot welder:If the DC current is close to complete welding point projection welding machine, the Sunal frequency points in convex welding no peak current obviously, the nugget size stable expansion, almost no splash, stable welding quality, high thermal efficiency. Compared with the power frequency welding machine, the welding current of the intermediate frequency welding machine can be reduced by 40%, and the service life of the electrode is prolonged greatly.It can reduce the interference in the opening area of big two loop, the welding current Sunal intermediate frequency point projection welding machine for DC magnetic induction, when there are two materials in primary winding, will not affect the welding.The response speed of the intermediate frequency spot welder is only 1/20 of the power frequency welder, and the current can reach the setting value more quickly. The parameters are analyzed more accurately, and the welding quality control is more accurate.Middle frequency spot welding machine three-phase load balanced, power factor is high (0.9 or so), energy conservation. Adaptability to power grid fluctuations and pressure drops is stronger, energy is partly stored by the inverter and replaced by load, which replaces the direct way to supply power to the load from the grid. However, it is difficult to guarantee the phase voltage between two phase power frequency welding machines, and the power factor is low (0.6 or so), so it is difficult to realize constant current output for three-phase power frequency welding machine.
The intermediate frequency spot welder (1000Hz) has the following obvious advantages:1. Welding specificationIf the response speed of the intermediate frequency spot welder is 1ms, the current can reach the set point more quickly, and can analyze parameters more and more accurately. The three-phase balanced input and the parameters are stable, and the constant current effect is stable;2. Welding qualityBecause of the frequency up to 1000Hz, the secondary frequency spot welder has good output ability of secondary current, and the waveform is flat and the size of the core is stable. Almost no spatter is produced, and the current in the primary stage of welding increases naturally, and the surface quality of solder joint is good.3, adaptabilitySuitable for welding many kinds of materials, such as aluminum alloy and aluminium, etc., which have fast heat conduction and poor weldability. The welding quality of galvanized sheet and ordinary multi plate is much higher than that of power frequency welding machine;4, transformerThe transformer is small in size and low in input power;5, energy utilization rateThree phase load balancing, power factor of more than 0.9, energy saving (according to the General Motors Corporation report, medium frequency spot welding, spot welding than power frequency welding, save 4 cents per point);6, auxiliary material utilization rate is no peak current and spatter significantly, shorten the time of welding electrode, long service life; improve the efficiency of AC, especially in the application of high speed welding.
