Moderate and high strength large-thickness component narrow gap or ultra-narrow gap magnetic control jet molten welding method

Abstract

The invention relates to a gas shielded welding method and device of a narrow gap or a super-narrow gap impulse jet current consumable electrode controlled by electromagnetic of the heavy section part with middle and high strength. The invention uses a magnetic coil (3) to provide excitation current processed by an excitation source, which can generate an extra magnetic field. Under the conditions of narrow gap or super-narrow gap, high feed rate, fused drop spray transfer and impulse welding current, the process of the gas shielded welding of the rotating jet current consumable electrode with high-melting frequency pulse that is controlled by the electromagnetic for the heavy section part with middle and high strength can be realized. The device of the invention comprises the excitation source, excitation equipment, auxiliary equipment and a water cooling system. The excitation equipment is the magnetic coil (3) with or without a conducting core (5). The excitation equipment is fixedon a welding burner (6), which is positioned above a work piece (9). The excitation current provided by the excitation source (10) produces stationary or time-varying electromagnetic mixing magnetic field that has the combination control over the processes of arc welding, wire burn-off, drop transfer, melting bath flow and welding line coagulation, which finally forms the welding line of good quality.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method and equipment for magnetron jet fusion welding of medium and high-strength thick parts with narrow gaps. Background technique [0002] With the formulation and implementation of national large-scale engineering projects and key engineering construction plans, such as the Three Gorges Project, large aircraft projects, etc., more and more major equipment is manufactured and produced using medium and high-strength materials and large-thickness structures. The application of modern welding technology occupies an important position and plays a more crucial role. [0003] Due to the complex welding process of medium and high strength and large thickness components, how to prevent weld defects, improve weld metal structure and weld joint quality, and improve welding efficiency are more prominent. At present, the main welding methods that can be used for welding ultra-thick an...

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Problems solved by technology

The third item is a rotating arc narrow gap welding method and device driven by a hollow shaft motor (patent number ZL200510038527.4). The generated arc is rotated and scanned to obtain uniform and stable penetration on both sides of the nozzle. However, the shape and structure of the external box-shaped nozzle are complex, the volume is large, and the arc is poorly observable. The external nozzle does not use water cooling measures. And the adjustment precision of its height adjustment device is low

Other researchers at home and abroad hope to use a single method of changing the mixed gas ratio, and hope to use a certain helium-free mixed gas to obtain a stable rotating jet transition welding. Practice has proved that this single measure cannot solve the problem of continuous high-current interval melting Stability of the droplet transition

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