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Comparison of welding quality comparison of welding quality comparison of ac spot welder with power frequency 1. Welding qualityIf inverter spot welding machine time adjustment resolution can be up to 0.25ms0.25ms ((1kHz inverter frequency inverter frequency),),), high control precision high control precision high control precision.Inverter welding feedback control response speed significantly accelerated feedback control response speed significantly accelerated, good output stability, good output stability.Power frequency ac spot welding machine due to the influence of current zero, low thermal efficiency due to the influence of current zero, low thermal efficiency, use thyristor to adjust the current thyristor to adjust the current, when the current percentage is small, when the current percentage is small, the time is long, the time is long, the influence is greater;Intermediate frequency inverter spot welder output current for pulsating dc output current for pulsating dc, under the action of loop inductance for continuous dc output with continuous dc output, high thermal efficiency, high thermal efficiency, stable welding heat input, stable welding heat input.Welding speed welding speed power frequency ac spot welder due to the impact of current zero due to the impact of current zero,, the heating time is relatively long.If inverter spot welding machine for dc output for dc output, centralized heating, centralized heating, welding time shortened welding time shortened.3, energy-saving effect energy-saving effect ac spot welder working at 50Hz50Hz, the transformer loss is large, the transformer loss is large, the power factor of the welder is low, the factor is low, the loop loss is large, the loop loss is large.If inverter spot welder transformer working at higher frequency frequency (1kHz1kHz),), very small loss very small loss very small, dc output improve power factor dc output improve power factor, obvious effect of energy saving is obvious.Equipment volume and weight equipment volume and weight ac spot welder transformer core larger transformer core larger, the same power condition equipment is bulky.If inverter spot welding transformer greatly reduced transformer greatly reduced, equipment lighter equipment lighter.