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A transformer-style welding power supply converts the moderate voltage and moderate current electricity from the utility mains (typically 230 or 115 VAC) into a high current and low voltage supply, typically between 17 and 45 (open-circuit) volts and 55 to 590 amperes.
The Alexanderson alternator transmitter, developed between 1906 and 1915 by Reginald Fessenden and Ernst Alexanderson, was a huge rotating alternating current generator driven by an electric motor at a high enough speed that it produced radio frequency current in the very low frequency range.
The company was founded in 1895 by John C. Lincoln with an investment of $200 to make electric motors he had designed. [3]The company is headquartered in Euclid, Ohio, and has 44 manufacturing locations, including operations and joint ventures in 19 countries and an international network of distributors and sales offices covering more than 160 countries.
[1] [2] [3] The RF power generator converts line power to high-frequency, high-voltage power for welding. Typical voltages are 1kVAC – 1.5kVAC at a frequency of 27.12 MHz. [1] The power needed for welding is based on the area of the weld, thickness, and the material. [2] The control unit is the system used for operating the machine.
The apparatus used for induction welding processes includes a radio frequency power generator, a heating station, the work piece material, and a cooling system. The power generator comes in either the form of solid state or vacuum tube and is used to provide an alternating current of 230-340 V or a frequency of 50–60 Hz to the system.
The International Institute of Welding Technology IIW published the Guideline "Recommendations for the HFMI Treatment" [3] in October 2016. An overview of higher frequency hammers (HFMI) is presented, and recommendations for the correct application of the method and quantitative measurements for quality assurance the guideline provides the basis for measurements of HFMI improved welded joints ...