Welding-synchronizing magnetic control device based on singlechip control and control method

Abstract

The invention provides a welding-synchronizing magnetic control device based on singlechip control and a control method. A synchronizing magnetic field, namely an external magnetic field, is synchronous with a welding process, namely the exciting current waveform is synchronous with the welding current voltage waveform; by testing the welding current voltage waveform, the phase of exciting current and the introducing time of a magnetic field are determined; and according to welding current, the amplitude of the exciting current is regulated and the introducing intensity of the magnetic field is determined so as to meet requirements for different external magnetic field forces in different stages such as arc morphological change, welding droplet transfer, and a flowing process of liquid metal in a welding pool. The welding-synchronizing magnetic control device has the characteristics of small volume, convenience for regulation, small electromagnetic interference, good waveform consistency, high exciting current regulating precision, low power loss and the like, has the overall efficiency of more than 90%, is applicable to multiple occasions such as TIG (tungsten inert gas) welding, MIG (metal inert gas) welding, MAG (metal active gas) welding and CO2 gas shielded welding, and has wide market prospect and wide application prospect.

Description

[0001] technical field [0002] The invention belongs to the technical field of welding electromagnetic control, and in particular relates to a welding synchronous magnetic control device and a control method based on single-chip microcomputer control. Background technique [0003] In recent years, magnetron welding technology has been widely used for its advantages of controlling the arc shape, improving the droplet transfer process, improving the metal flow process of the molten pool, and optimizing the weld shape. As a key component in the research of magnetic control welding technology, the magnetic control device is directly related to the welding process and the quality control of the weld. Over the years, people have done a lot of work from the simple rectifier circuit output DC magnetron device to the dual-T network circuit segmentally adjusted output frequency magnetron device, from the analog control technology-based magnetron device to the application of digital c...

AI Technical Summary

Problems solved by technology

Some literatures have introduced an inverter square-wave welding electromagnetic stirring power supply, which adopts a full-bridge double-inverter structure and PWM control methods such as SG3525 and SG3526. This device can improve the structure and performance of the weld and is suitable for various welding methods. Due to the use of analog control, its control accuracy and flexibility are limited; some literature introduces a full-digital double-inversion magnetic control arc alternating magnetic field generator, using LM3S818 microcontroller as the control core

There is also a literature that introduces a single-chip microcomputer (P87LPC768) to control a special power supply for magnetically controlled arcs. The above two electromagnetic control devices or power supplies are all digitally controlled, and their control flexibility and control accuracy are greatly improved. The current and other parameters are sampled, so that the external magnetic field is introduced in a disordered or random state, and the synchronous control with the welding process cannot be realized

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