Oscillation welding method under the effect of magnetic lens and magnetic lens device

Abstract

The invention relates to an oscillation welding method under the action of a magnetic lens and a magnetic lens device. The method controls welding arc by an additional magnetic field and exerts an alternating magnetic field in the direct current welding process and a direct current (DC) magnetostatic field in the alternate current (AC) process so as to produce electromagnetic oscillation; meanwhile, the welding arc is effectively controlled by the magnetic lens device. The magnetic lens device has a double pole-shoe magnetic lens device arranged above a welding seam and a single pole-shoe magnetic lens device arranged under the welding seam. The magnetic lens device exerts the electromagnetic oscillation and the grain structure of the welding seam is converted from the original bulky columnar crystal to the fine equiaxial crystal, the magnetic field strength around the pole shoe of the magnetic lens device can be doubled when the magnetic lens device is used, which can control the electric arc more effectively. The magnetic lens device provided by the invention has the advantages of reasonable design, simple and compact structure, easy realization and convenient operation.

Description

technical field [0001] The invention relates to a magnetic field control welding method and a magnetic field generating device thereof, in particular to an oscillation welding method under the action of a magnetic lens and a magnetic lens device. Background technique [0002] With the development of material science and engineering technology, modern structural materials have higher and higher requirements for welding quality. Studies have shown that the internal grain structure of the welded joint significantly affects the strength and other properties of the weld metal, and the fine equiaxed grains can reduce crystallization cracks and improve mechanical properties (such as strength, toughness, fatigue life). Therefore, controlling the morphology and size of grains inside the welded joint has become a research hotspot. The magnetic field control welding technology is to control the welding arc through the external magnetic field, which affects the shape of the arc, the dr...

AI Technical Summary

Problems solved by technology

The existing forms of magnetic fields used in welding technology at home and abroad mainly include transverse magnetic fields, longitudinal magnetic fields, sharp-angle magnetic fields and rotating magnetic fields. It has been proved by a large number of experiments that these types of magnetic field forms can adjust the arc, mainly by adjusting The excitation current realizes the adjustment of the magnetic field, thereby affecting the shape of the arc and improving the shape of the weld seam

[0003] Although the existing magnetic field form adjusts the magnetic field size by adjusting the excitation current, and then realizes the influence on the arc shape, droplet transfer, and molten pool state, and improves the welding process, but this only realizes the adjustment of the excitation current. The device affected by the welding process is not perfect

On the one hand, it can only adjust the size of the magnetic field, but cannot adjust the distribution of the magnetic field; on the other hand, it has a small adjustment range for the magnetic field strength. To achieve a large magnetic field strength, a large coil or a large current is required, which is very important for practical engineering. applications are difficult

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