Automatic voltage regulation (AVR) singlechip control-based thick wire electric-gas vertical welding machine and control method

Abstract

The invention relates to an automatic voltage regulation (AVR) singlechip control-based thick wire electric-gas vertical welding machine and a control method. The welding machine comprises a three-way trolley travelling set circuit, a swing front and back stop set circuit, a swing amplitude and speed set circuit, a welding torch centering swing control set circuit, a welding start / end control circuit, a digital display circuit, a welding mode selection control circuit, a welding start / stop control circuit, an optocoupler isolation circuit, a travelling motor control drive circuit, a swinging motor control drive circuit and a motor voltage current feedback circuit. In the method, welding voltage is sampled to serve as a feedback control signal of automatic climbing of a trolley and the change of wire feeding speed; when the arc length is increased by interference in the automatic welding process, the arc voltage is increased and the wire feeding speed is increased, so that the arc length is reduced, and the speed of a climbing direct current servo motor is reduced, so that the arc length is reduced; when the arc length is reduced by interference, the arc voltage is reduced and the wire feeding speed is reduced, so that the arc length can be increased; and when the arc length is not changed in the automatic welding process, the wire feeding speed and the travelling speed of the climbing trolley are not changed, so that the arc length is stable.

Description

technical field [0001] The invention relates to an automatic welding equipment and a control method for welding large and thick metal plates, in particular to the composition of a gas-electric vertical welding system, arc length stabilization technology, a digital motion controller and a control method. Background technique [0002] Electric gas welding (EGW for short) is a kind of high-efficiency gas metal arc welding developed jointly by gas metal arc welding and electroslag welding. Compared with narrow-gap MIGA welding, which relies on multiple welding to complete the weld, EGW can form a weld in one welding; compared with electroslag welding, which relies on slag resistance heat for welding, gas-electric vertical welding relies on arc heat. Welding, energy density is higher and more focused. [0003] The existing gas-electric vertical welding system is mainly composed of a welding power source with flat outer characteristics, a constant-speed wire feeding mechanism and...

AI Technical Summary

Problems solved by technology

[0004] The gas-electric vertical welding system composed of the existing welding power supply with flat external characteristics, constant-speed wire feeding and variable-speed crawling trolley system is mainly used for welding thin wires below 1.6mm and medium and thick plates below 40mm; such as welding large plates above 40mm When the plate is thick, the welding production efficiency still cannot meet the actual welding production demand

This gas-electric vertical welding system uses integrated circuits as the core to form a variable-speed crawling car automatic control system, which has disadvantages such as low control precision, slow dynamic response, inconvenient parameter adjustment, serious temperature drift, and easy aging.

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