Variable polarity plasma arc welding pore suppression method based on spot cluster directional movement control and quality compensation

Abstract

The invention discloses a variable polarity plasma arc welding pore suppression method based on spot cluster directional movement control, and belongs to the field of forming and manufacturing. A device is composed of a variable polarity plasma arc perforation welding system and a pulsed magnetic field generating device, a pulsed magnetic field controls the position of cathode spots on the surface of a workpiece in the positive polarity plasma arc welding stage, the cathode spots are gathered at the front end of a small hole for perforation welding, and a compact oxide film on the surface of the workpiece is cleaned before the small hole reaches the position; and because the current density of the cathode spots is large, according to the electromagnetic force action principle, the cathode spots are concentrated at one position under the action of the magnetic field to remove the oxide film, the direction of the magnetic field is adjusted to enable a cathode spot cluster to move on the surface of a perforated molten pool, and bubbles are evaporated and released by utilizing the thermal action of the spots. The action mode not only can quickly and effectively clean the oxide film and reduce the defect of pores in a welding seam, but also can increase energy absorption of the workpiece to an electric arc and improve the energy utilization rate, and can be applied to welding of a large complex structure or a high-alloy material.

Description

technical field [0001] The invention belongs to the field of forming manufacturing methods, in particular to a method for suppressing pore defects based on the orientation control of cathode spot clusters. Background technique [0002] The increasing international energy crisis and the promulgation of environmental protection policies have promoted the development of modern manufacturing in the direction of high efficiency, low energy consumption and green pollution-free. Lightweight equipment is currently recognized as an important way to effectively reduce energy consumption. It is imperative to promote high-performance light alloy materials represented by aluminum alloys. The promotion and application of aluminum alloys is inseparable from high-efficiency and high-quality processing technology. As a traditional metal material processing technology, welding technology is indispensable in the manufacture and production of aluminum alloy equipment. With the increase in struc...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and deficiencies of the existing welding methods, and provide a VPPA perforation welding porosity defect suppression method based on spot cluster directional movement control. By applying a magnetic field perpendicular to the arc axis, the cathode spot movement control is realized by using electromagnetic force , the movement of spot clusters suppresses the pore defects while improving the stability of perforation welding, setting the magnetic field pulse and angle characteristics to realize the cleaning of oxide film and air bubbles by spot clusters, orderly control the disordered and jumping cathode spots, and target them in stages On the surface of the molten pool and the oxide film area, the dual control of welding shape and quality can be realized, and the welding reliability of aluminum alloy structures can be improved.

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