The hydraulic butt welding technique of hydraulic butt fusion pipe welding machine is mainly to use the workpiece counterpart touch resistance to generate heat to heat the workpiece, the metal surface is melted, the temperature gradient is large, and the heat affected zone is relatively small. The hydraulic process has the self-maintenance function of exhausting air and reducing metal oxidation. Upsetting can also discharge oxides with the liquid metal out of the weld. The weld has less defects such as impurity and incomplete penetration. The hydraulic process has a strong self-regulating function, and has low requirements for strict adherence to standards. The quality is stable. The electric power required per unit welding cross-sectional area is small, and the welding low-carbon steel only needs (0.1-0.3) KVA/mm2 electric power.
The weld seam is formed under the condition of plastic deformation of the solid phase metal of the workpiece. The welding seam arrangement and composition are close to the basic metal, and it is relatively simple to obtain the equal-strength plastic welded joint. The welding yield rate is high, and it only takes a few times to weld one joint. Seconds to tens of seconds. Welding has a wide range of applications. In principle, all metal materials that can be cast can be welded by hydraulic butt welding. For example, non-ferrous metals such as low-carbon steel, high-carbon steel, alloy steel, stainless steel and other non-ferrous metals can be welded by hydraulic pressure. Butt welding. The welding cross-sectional area is large, generally from tens to tens of thousands of mm2. The cross-sectional area can be welded. The hydraulic butt fusion pipe welding machine is widely used in welding various plates, pipes, profiles, solid parts, tools, etc. It is very extensive and is an economical and high-power welding method.
