Product Name: Long Arm Middele Frequency Inverter DC Spot Welding Machina Model NO.: MF-50~300KVA Type: Universal Welding Spot Number: Single Conductive Way: Both-Sided Transmission: Hydraulic Electric Current: Inverter DC Electrode Stroke: Vertical Style: Fixed Cooling Way: Water Cooling Control: Semi-Automatic Rated Capacity: 50-300kVA Primary Voltage: 380V/415V/480V 50/60Hz Rated Duty Cycle: 50% Usage: Welding Thicker Workpiece Color: Blue Max Welding Current: 18500A-80000A Parameter/ModelTmf-50kVATmf-90kVATmf-15: 75mm-100mm Welding Arm Spacing: Can Be Customized Trademark: Durowelder Transport Package: Angle Iron frame and Human Made Wooden Sheet Box Specification: Depends Origin: Guangdong, China HS Code: 8515190000 Product Description Long Arm Middele Frequency Inverter DC Spot Welding MachinaMain Application and Characteristic:1. Resistance Welding is one kind of welding technology which melt the metal material by the resistance heating energy which is generated by the welding current passing the workpiece itself. Therefore by increase or adjusting the welding current frequency, it can change and improve the welding quality.Just basing on this theory, we develop the Middle Frequency Inverter DC Welding Machine, its welding current frequency increase to 1000HZ from common 50HZ or 60HZ.The controlling time precision is much higher, the power factor is more than 98%, without eddy current electromagnetic induction interference, the welding quality is also improved alot.2. While not for all the workpiece, the current optimum value is all same as 1000HZ, some need bigger welding frequency, others need less, just because this reason, basing on the Middle Frequency Welding Technology, we also develop VF Series Variable Frequency Welding Machine which welding frequency is adjustable.The principle is that by the added aIGBT pulse width adjustable "Welding Controller" and the output voltage of Vand transformer turns Nall adjustable "Welding Transformer" to fulfill the function of adjustable frequency.3. However, these two kinds of welding methods both can not adjust welding currecnt value of each welding automatically according to the subtle changes of workpiece.In order to meet much higher request to welding quality, such as for the automotive, aircraft and other high-end products, we develop one kind of "Dynamic Resistance Principle Auto Self Adaptive Control System". It can install to both MF and VF Welder, by this way they can adjust the welding current automatically basing different product.This system is based on the constant current mode control technique, according to the workpiece thickness, different dirt surface of workpiece and the corrosion degree, current shunt, the operator's individual difference factors, such as the subtle changes and solder joints, it can automatically adjust welding current during the welding process of each welding spot, ensure the consistency of the welding quality and effect.4. Middle Frequency and Variable Frequency Welder are both powered by three-phase power, compared to the traditional AC welder two-phase power supply, will not cause the fluctuation of power supply, also can adapt suddenly lifting voltage strongly. Current output is also more accurate, more stable, more energy saving and more efficient.5. These kinds of higher technology is specially suitable for welding higher conductive rate of material, such as aluminum, copper, silver, and so on. Also good at welding much more thicker workpiece, automobile, aerospace, and other high request products and industry.Parameter/ModelMF-50KVAMF-90KVAMF-150KVAMF-170KVAMF-250KVAMF-300KVARated Voltage3-Phase, AC, 380---415----480V, 50/60HZ.Rated Capacity50KVA90KVA150KVA170KVA250KVA300KVARated Duty Cycle50%50%50%50%50%50%Max Welding Current18500A23500A32000A40500A56500A80000AElectrode Stroke75MM100MMWelding Arm Spacing260MM320MMAir Source Pressure0.6MPaCooling Water Flow16L/Minute25L/Minute35 L/Minute45L/MinuteIf you want to know more information about our products, please feel free to contact me!Telephone:0086 13424145656