In the experiments, when the power voltage varies from 342V to 418V, and the load from 25N to 50N, the variation ratio of the wire-feeding speed is small than 5%, which satisfies the JB/T9533-1999 professional standard.

• 实验证明，当电源电压由342V变到418V，负载从25N变到50N时，送丝速度的变化率小于5%25，符合JB/T9533-1999专业标准要求。