Mini-type inversing manual arc welding machine

Abstract

The invention relates to a mini-type inversing manual arc welding machine. A control circuit board in the mini-type inversing manual arc welding machine is designed to comprise three parts including a power board, a power supply board and a control board; an arranged circuit of the power board mainly comprises a single-end normal-shock inversing circuit composed of a rectifier bridge, electrolytic capacitors, IGBTs, diodes, a main transformer, a current detection mutual inductor, output rectifier diodes and the like, radiators and part of components; the power supply board mainly comprises an electrifying buffer, a switch power supply and an IGBT driving circuit; the control board mainly comprises a PWM output characteristic control circuit, a non-load voltage limiting circuit, an overcurrent and overheat protection circuit and a long-time output short-circuit protection circuit. The three circuit boards are designed in order to not only take the size and the weight of the welding machine into account, but also take cost factors of transportation and after-sales maintenance into account, and advantages of being reasonable in design, convenient to maintain, stable and reliable are achieved.

Description

technical field [0001] The invention relates to a miniature inverter hand arc welding machine, which belongs to the technical field of inverter welding machines. [0002] technical background [0003] Manual arc welding machines have a large sales volume and a wide range of applications. However, for this type of welding machine, different circuits, circuit boards and complete machine structure designs, different control principles and methods, layout and connection methods of circuit boards and complete machines, or different degrees of complexity of connection, the production process and production The process, etc. will be completely different. These will affect the performance, reliability, production efficiency and transportation costs of the product, and ultimately affect the market competitiveness of the product. [0004] At present, in the domestic and foreign markets, the rated current of IGBT tube inverter manual arc welding machines is usually at the level of 80~...

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Problems solved by technology

[0005] In addition, the design of the welding machine circuit also determines the welding performance of the product. If the design is not good, the following problems will occur: 1) The circuit board design is unreasonable, resulting in high maintenance costs

2) The size and weight of the product are too large, which increases the manufacturing cost; 3) The dustproof performance is not good, resulting in a decrease in the reliability of the welding machine

After the inverter welding machine is used for a long time, some conductive metal dust on the work site will be adsorbed between the pins of devices such as IGBT tubes and the control circuit board, resulting in a decrease in creepage distance and failure of devices and control circuits; 4) anti-corrosion Poor ability to fluctuate network voltage

For example, when the input power voltage of the power grid is low, such as below 180VAC, the welding machine cannot perform normal welding even if a thinner electrode is used; this limits the application range of the welding machine to a certain extent; 5) The reliability of the control circuit is not high, it is easy to cause failure, and the repair rate of the welding machine is improved.

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