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See Chinese contents: GB 28736-2019 GB 28736-2019: Minimum allowable values of energy efficiency and energy efficiency grades for welding machines
This Standard specifies the energy efficiency grades, minimum allowable values of energy efficiency and test methods for arc welding machine and resistance welding machine. This Standard is applicable to the arc welding machine and resistance welding machine that are designed for industrial and professional use, not exceeding the voltage specified in GB/T 156.
