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        Precision Welding Oscillate System
        Precision Arc Length Control System
        Precision Resistance Welding Control System
        Welding Video Monitoring System
        Automated Welding Equipment
        Plasma Arc Welding Machine
        Special Aluminum Welding Machine
        Another Products

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        Precision Resistance Welding Control System is general equipment to assure more perfect resistance welding process. A microprocessor with a powerful software is the core control unit, and the software is special design for resistance welding. From a single phase power supply, the low frequency welding control utilizes an inversed parallel pair of Silicone Controlled Rectifiers (SCR) to control the output the welding power transformer. SCRs are turned on by pulsing a gate with a voltage signal. The welding control uses predictive algorithms to determine the best point to pulse the gate of the SCRs during the half cycle of the alternating current supply. The SCRs are turned off only when the alternating current supply is below the threshold point called "minimum holding current". This occurs near the zero crossing point of the AC power supply. Every welding moment is controlled precision from power cycle.

        Resistance welding is an electromechanical process that is used to assemble metallic parts. A basic understanding of the electrical and mechanical components of the process will provide the foundation for developing control algorithms that benefit the users of this assembly method. It is a good practice to design welding tools beginning at the requirements of the weld nugget and progressing outwards to the controls. Mistakes can be made if one decides first on controls before considering the weld results that are needed. The progression shown on the left starting with the welding process (i.e. spot or projection) then continuing on to mechanical tools, then power transformers, then finally welding controls is the order to follow.




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