UN-3 Series Butt Welding Machines is one kind of resistance butt welding equipment specially designed for Copper Tube and Aluminum Tube Inserting Method welding, it can replace the High-voltage Flash Welding Machine with lower and old technology. The System adopt Programmable Logic Controller (PLC) as the action logic controlling unit;adopt Special Microcomputer Welding Controller as the welding process control unit;adopt the High-quality Aluminum Alloy Cylinder and High-precision Beeline Bearings cooperated with High-precision Lathe Lever to make sure that the machinery actions precision. It has the reliable welding quality, easy and simple control and adjustment, high productivity,no gas leakage phenomenon,and some other excellences.At the same time it also overcome the shortcomings.of old welding technology need to reprocess the welded tube and high-voltage which is easy to cause accident. Basic Technical Parameters: 1, Power Supply: 380-440 VAC 50-60Hz(single phase); 2, Rated Capacity: 30 KVA-75KVA; 3, Welding Tube Diameter:Aluminum Tubes:φ4-19.05mm+Copper Tubes: φ4-19.05 mm; 4, Clamping Cylinder Space: ≥ 20 mm; 5, Horizontal Cylinder Space:5-20 mm(adjustable);