Development and application of thick wall straight seam steel five-wire submerged arc process

In the thick wall LSAW steel pipe production process, five -wire submerged arc welding process has been a hot research. Currently, only a few countries in the world to master this advanced production technology. Five power wire submerged arc welding using five were arranged longitudinally along the welding wire five separate power supply, the wire solder layer in the pool under a total combustion, enabling the pipe welding. Since more than five arc welding wire, current, pool length, and therefore has a large heat input, high deposition efficiency, metallurgical reaction fully, welding speed, etc. In five wire submerged arc welding process development projects, there is significant electromagnetic interference between AC arc, multi- adjustable parameters, process control and so demanding and difficult. Specifically in the configuration of the welding power source and connection of the wire set spatial position welding parameter selection, the combination of wire diameter and the selection of solder and so on. Where welding power supply configuration, wire spatial position and the welding parameters design choice is the focus of the development process, which is the key technical problems choose reasonable power connections as well as many rational combination of variable parameters.

Introduction of virtual manufacturing technology for non- mandrel -drawn steel production process modeling and simulation, cold drawn steel pipe can operate virtual machines, draft and draft seats, the virtual deformation and bending the material, and for the metal in the deformation process generated in the longitudinal extension and lateral flow causes the inner wall of uneven metal flow problems for the overall coordination and dynamic process optimization; while the material hardness, bending springback, outline size , aspect ratio and other issues simulation. Through this virtual computer model to observe the deformation process of the metal vertical extension and lateral flow, pipe wall thickness changes, and adjust draft and draft seat size, pipe wall thickness of the original with the original diameter ratio, each parameters such as reducing the amount of times, improve product quality.