IGBT (Insulated Gate Bipolar Translator) inversion non-gas-shielded welding machine

Abstract

The invention relates to an IGBT (Insulated Gate Bipolar Translator) inversion non-gas-shielded welding machine. The voltage of the power source of the welding machine ranges from 110 to 120 V; and the frequency of the power source of the welding machine ranges from 50 to 60 Hz. The interior of the welding machine is divided into an upper layer and a lower layer through a middle partition plate. The upper layer is mainly provided with a wire feeder, a welding wire reel shaft and a front control panel. The lower layer is mainly provided with a power control panel, an output filter reactor, a cooling fan and the like. The control circuit boards of the welding machine include a front control board and a power control board. A control circuit comprises a power-on buffering, voltage doubling, rectifying and filtering circuit, an IGBT driving, inversion, output rectifying and filtering circuit, a switching power supply circuit, an indication, voltage and current (or wire feeding speed) setting and wire feeding control circuit, and an output characteristic and protection (such as overcurrent, overvoltage, undervoltage and overheating protection) control part. The structure schematic diagram of an exemplary welding machine and the circuit schematic diagram of each part of the welding machine are provided; and the structure schematic diagram and the circuit schematic diagrams are correspondingly explained. According to the welding machine, a non-gas-shielded flux-cored wire is adopted, so that protective gas is not needed; semi-automatic welding can be realized; and the control circuit is simple and reasonable in design, high in working reliability and low in product manufacturing cost.

Description

technical field [0001] The invention relates to an IGBT inverter airless shielded welding machine. It belongs to the technical field of inverter welding machines. [0002] technical background [0003] As we all know, inverter MIG / MAG gas-shielded welding machines generally need to use shielding gas for welding. There is a type of welding machine, which uses self-shielding flux-cored wire welding, which does not require users to use shielding gas, which provides users with no protection. Welding under the condition of gas has brought great convenience; for example, home users do not have the conditions to use shielding gas like industrial users, so, for such users, a welding machine using gas-free shielded flux-cored wire welding is developed It is still very necessary and has a relatively broad market; although it is certainly possible to use MIG / MAG gas-shielded welding machines and self-shielded flux-cored wires for welding, but this type of welding machine is not the sam...

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Problems solved by technology

[0004] In the domestic and foreign markets, the rated current of IGBT tube inverter gas shielded welding machines is usually at the level of 140~200A (load duration 60~20%); for welding machines without gas shielded flux cored wire, due to its adaptability Strong, so its application range will be wider; this kind of welding machine, different circuit, circuit board and machine structure design, control principle and method are different, the layout and connection mode of circuit board and machine, the product's The technology, reliability and production process are also completely different; these will affect the market competitiveness of the product. Although there are welding machines without gas-shielded flux-cored wire welding on the market, their protection functions are few, usually only overheat protection, and the work of the circuit Low reliability, high production cost and high sales price; therefore, it is technically difficult to develop a high-reliability, low-cost non-gas shielded flux-cored welding machine under the premise of low cost

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