The Simulation Of Heat Source For Twin-Wire Submerged Arc Welding And Experimental Study

In the manufacturing of large-sized workpieces,submerged arc welding has been widely used in it because so many advantages, submerged arc welding production efficiency is getting higher and higher, at the same time double wire submerged arc welding technology is also pay attention to, while engineering technology level gradually improve, magnetic field is adopted in the processing of submerged arc welding, which successfully improve the crystallization of molten pool, refine the grains and thus improve the welding quality.The influence of magnetic field in the process of submerged arc welding was studied in this paper, Using ABAQUS software to double wire submerged arc welding temperature field 3D dynamic simulation, contrast to simulate the different parameters of the weld temperature field. Analysis and study of welding current, welding voltage, welding speed, the parameters on the fusion width of weld depth of molten influence, simulation results indicate that if the welding current, voltage are increase, The fusion width weld depth of molten are increasing too, but along with the increase of welding speed, the fusion width weld depth of molten decrease trend. We also worked out a special magnetic head for the submerged arc welding. The structure of the head is solenoid which has many advantages such as good thermal conduction, simple processing of manufacturing and the magnetic field it produced was able to act on the molten pool effectively.Electromagnetic stirring device which used the dual inverter structure and the power and the excitation head installation had been debugging,corresponding magnetic field was applied in the submerged arc welding of the D36 steel. The experimental results shows the patterns of influence on the fusion-width, the macrocosm appearance and the metallographic structure of welding beam under different magnetic parameters. The experiments shows that the applied magnetic field has a great influence on the appearance of the welding beam According to the experiments, the fusion-width decreases from 29 mm to 22 mm under certain magnetic field with the penetration decreases and the weld reinforcement increases in the same time. All of above shows that the electromagnetic stirring is able to improved the weld microstructures by transforming the pearlite to the sorbite under the influence of magnetic field and eventually improves the toughness and strength of the welding beam.