Digital wire feeding system

Abstract

A digitalized wire feeding system for welding has a HF modulating pulse circuit. A given wire-feeding speed signal is applied to the collector of the MOSFET (W1). When the weld beginning signal is active, the high level at the gate of MOSFET (T1) can turn on the MOSFET (T2) and said wire-feeding speed signal is inputted to the control pin of PWM chip, which outputs a pulse to turn on the MOSFET (T2). A voltage is applied to the wire-feeding moto to rotate it.

Description

technical field [0001] The invention relates to a wire feeding system of a welding machine, in particular to a digital wire feeding system. Background technique [0002] The speed regulation system of the wire feeding motor in the welding machine system generally adopts the SCR-M system. Its main circuit adopts MOSFET as the single-end switch tube, and L, C, D switching power supply as the power supply of the armature group. Due to the long control period of the SCR, the response speed of the system is slow. When the grid voltage fluctuates in a large range , the compensation ability is poor, which affects the stability of wire feeding and causes fluctuations in welding specifications and welding quality. Moreover, the speed ratio of the general SCR-M speed control system is difficult to exceed 10, which makes it difficult for the same wire feeding system to take into account both thick and thin wires, which limits the current adjustment range of the welding machine, and ac...

AI Technical Summary

Problems solved by technology

Its main circuit adopts MOSFET as the single-end switch tube, and L, C, D switching power supply as the power supply of the armature group. Due to the long control period of the SCR, the response speed of the system is slow. When the grid voltage fluctuates in a large range , the compensation ability is poor, which affects the stability of wire feeding and causes fluctuations in welding specifications and welding quality

Moreover, the speed ratio of the general SCR-M speed control system is difficult to exceed 10, which makes it difficult for the same wire feeding system to take into account both thick and thin wires, which limits the current adjustment range of the welding machine, and accordingly makes the welding machine adaptability is limited

In addition, the system does not consider the situation that the voltage cannot be compensated when the wire feed line is too long during the welding process, which will be limited in actual use. Similarly, the system does not have a sudden brake function, which increases the failure rate during the welding process

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