... /200/300 Rated capacity: 80/150/200/300 Mid-frequency inverter spot projection welding machineCharacteristicHigh quality, high efficiency of the welding ... DC, current ismooth, inductance is zero. 1000 HZ work frequency, time control precision is 1 MSThe body is made of high ... +3.5 aviation, aerospace, automotive, compressors, Save electri medium frequency inverter spot (projection) welding machine