Ultrasonic narrow gap welding system and method for aluminum alloys

Abstract

The invention discloses an ultrasonic narrow gap welding system and method for aluminum alloys. The welding system is composed of an ultrasonic frequency excitation power source, a coupled waveform control system, a welding power source, a narrow gap welding torch and a joint control switch. The welding method is as follows: The joint control switch performs asynchronous and precise control of the welding circuit and the ultrasonic circuit according to the set program; the coupling waveform control system uses the current limiting resistor to control the charging and discharging of the coupling capacitor to realize an ultrasonic frequency coupling electric signal with low thermal influence, thereby avoiding the additional heat of the electric coupling. The adverse effect of input on the grain refinement of the weld; by controlling the ultrasonic excitation frequency to ensure that the molten pool is in resonance during welding of each layer, changing the ultrasonic input energy during welding of different layers, realizing the homogenization of the structure of the narrow gap welding joint, and removing the weld Air holes solve the problem of uneven joint performance. At the same time, the swing angle and sidewall dwell time of the traditional swing arc narrow gap welding are reduced, and the welding efficiency is improved.

Description

technical field [0001] The invention relates to an aluminum alloy ultrasonic narrow gap welding system and method with low thermal influence and high efficiency, and belongs to the technical field of narrow gap arc welding. Background technique [0002] Thick-walled aluminum alloys are widely used in aerospace, shipbuilding, nuclear power and other fields, and their welding quality is directly related to the reliability and service life of related products. Therefore, the welding of thick-walled aluminum alloys deserves attention. As a high-efficiency, high-quality, low-cost welding method, narrow-gap arc welding has a strong competitive advantage in the welding of thick-walled aluminum alloys. Among them, the narrow gap melting electrode welding method has higher welding efficiency than the non-melting electrode welding method. At present, in order to effectively control the occurrence of sidewall fusion defects in narrow gap welding, the existing narrow gap welding techno...

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Problems solved by technology

[0007] The purpose of the present invention is to propose a method that can achieve uniform weld structure, remove weld seam, etc. A low thermal impact, high-efficiency aluminum alloy narrow-gap welding system and method for seam pores, improved welding speed, and wide application range. By coupling the ultrasonic frequency electrical signal generated by the ultrasonic excitation power supply with the welding electrical signal, the coupling capacitance is controlled. The charging and discharging speed is fast, and the composite welding electrical signal with negligible heat input change and ultrasonic effect can be obtained, which excites the molten pool-ultrasonic resonance, changes the ultrasonic intensity during welding of each layer, and realizes high-efficiency and high-quality thick-walled aluminum alloy narrow gap arc welding

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