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Computer programs for welding cost calculations
Read MoreSpecification and approval of welding procedures
Read MoreWelding inverters Inverter units appeared on the market during the second half of the 1970s. In a primary- switched inverter unit, the 50 Hz mains supply is first rectified and then, using power semiconductors, is turned back into AC at a higher frequency, usually in the range 100 kHz. This reduces the weight of the transformer and inductor to a fraction of what is needed for a 50 Hz unit, making the power unit small and portable. Low losses result in high efficiency, to the order of 80-90 %. The high working frequency also allows the unit to be controlled at a speed that is comparable with the rapid processes occurring in connection with droplet transfer in the arc. Such units can therefore have excellent performance.
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