The butt welding machine is widely used in the longitudinal connection of steel bars and the welding of prestressed steel bars and screw end rods. The principle of flash butt welding of steel bars is to use a butt welding machine to contact the steel bars at both ends, pass a low-voltage strong current, and after the steel bars are heated to a certain temperature and soften, perform axial pressure upsetting to form a butt welded joint. Continuous flash welding, preheating flash welding and flash-preheating-flash welding are commonly used in flash butt welding of steel bars. Grade IV steel bars are sometimes subjected to electrical heat treatment after welding.
Butt welding has a wide range of applications. In principle, all metal materials that can be forged can be welded by flash butt welding. For example, low carbon steel, high carbon steel, alloy steel, stainless steel and other non-ferrous metals and alloys can be welded by flash butt welding. The range of welding cross-sectional area is large, and generally the cross-sectional area can be welded from tens to tens of thousands of mm2. Flash butt welding is widely used in welding various plate parts, pipe fittings, profiles, solid parts, knives, etc. It is widely used and is an economical and efficient welding method.
6 main advantages of butt welding machine:
1. Energy saving. Radiator flash butt welding machine uses two 125KVA resistance welding transformers as power supply, pneumatic compression, upsetting, no hydraulic station. Compared with other welding machines that use two 315KVA single-phase AC welding resistance transformers and two 18KVA hydraulic station welding machines, the UN-250AB welding machine can save up to 78℅ of electricity.
2. Low requirements on the power grid. Only a 250KVA power grid is required.
3. High welding precision. Programmable controller PLC and imported stepping motor are used to control the flashing process, which can accurately set the burning amount and burning speed; the welding current is controlled by the microcomputer solder resistance controller. The error of the center distance of the chip after welding can be controlled within ±0.2 within mm, it is convenient for subsequent chip welding.
4. Automatic centering function. Ensure that the distance between the two ends of the pipe string and the two chip ends is consistent before welding, so as to ensure the consistency of the burning amount at both ends.
5. High welding efficiency. Since the workpiece is pressed using a double-force cylinder, its response speed is significantly faster than that of a hydraulic cylinder.
6. Easy to operate and maintain. Since there is no hydraulic station, there are fewer debugging points and failure points of the product, and there will be no oil leakage and other phenomena.
