Gas protective welding machine controlled circuit

Abstract

The invention discloses a control circuit for a gas shielded welding machine, including a main control circuit board, a gearshift switch, a transformer, a rectifying circuit, a shift select switch driven-by-wire and a relay, wherein the selection end of the shift select switch driven-by-wire connects to an output end of the main control circuit board, output end of the shift select switch driven-by-wire connects to an input end of the corresponding relay, and a power source connects to the gearshift switch after supplying power supplying via a switch of the relay. The shift select switch driven-by-wire is arranged on a part of a pistol, thus when welding voltage is required to be adjusted during in remote operation, the shift select switch driven-by-wire is just to be moved, then the relay on the welding mainframe will attract according to a corresponding control signal, adjust and turn on different primary coil tap of the transformer, thus adjusting of the welding voltage can be achieved. The invention can be used more conveniently, in addition, electric spark generated in switching by a mechanical shift select switch can be avoided due to the switching is carried out by the relay, thereby, the invention has longer service life.

Description

technical field [0001] The invention relates to a control circuit of a welding machine. In particular, the invention relates to a control circuit of a gas shielded welding machine with a wire control function. Background technique [0002] Existing gas shielded welding machines can be divided into two types, one is suitable for close-range operation, including the main machine of the welding machine, the power cord of the welding wire and the welding torch extends from the main machine to the welding torch, and the other is suitable for relatively The remote operation includes the main machine of the welding machine and the welding torch part with the wire feeding device separated from the main machine, and the power cord extends from the main machine to the welding torch part. Regardless of the kind of gas shielded welding machine, for different welding materials and welding environments, it is necessary to adjust the welding voltage or welding current to achieve the best ...

AI Technical Summary

Problems solved by technology

However, the existing gear switches for these voltage adjustments or current adjustments are all installed on the main machine of the welding machine, which will not cause inconvenience for short-distance operations, but if it is a long-distance operation, the welder needs to adjust the voltage and current. Waiting to run back and forth is very inconvenient

Moreover, the existing gear switches are all of mechanical switching type, which will generate instantaneous high voltage to form electric sparks when switching, which will affect the service life of transformer coils and gear switches.

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