Micro-arc spot welding power supply and micro-arc spot welding method

Abstract

The invention discloses a micro arc spot welding power supply. The micro arc spot welding power supply comprises a main circuit for outputting high-frequency power to a welding gun, a digital signal processing (DSP) controller, and a current sampling circuit and a voltage sampling circuit which are connected to the output ends of the DSP controller and the main circuit respectively; the current sampling circuit is used for acquiring the current value output by the main circuit to obtain a feedback current and outputting the feedback current to the DSP controller; the voltage sampling circuit is used for acquiring the voltage value output by the main circuit to obtain a feedback voltage and outputting the feedback voltage to the DSP controller; and the DSP controller is used for controlling and adjusting the duty ratio of pulse width modulation (PWM) signals according to the set first current value, the feedback current and the feedback voltage and outputting the PWM signals to control the current output by the main circuit. By adopting the power supply, the melting quantity of workpieces is accurately controlled. The control precision of the power supply is high, and formed joints are uniform, beautiful and high in consistency. In addition, the invention also provides a micro arc spot welding method for overcoming the defects that the quality of the welded joints is instable and the outer parts of the welded joints are not smooth enough.

Description

technical field [0001] The invention relates to the technical field of arc welding, in particular to a micro-arc spot welding power source and a micro-arc spot welding method. Background technique [0002] With the development of miniaturization, miniaturization and high performance of electronic products and the rapid development of cutting-edge science and technology such as aerospace, the requirements for the welding quality and performance of various miniature parts are getting higher and higher, and improving the welding accuracy is already a little The key to product manufacturing success. [0003] Precision welding technology is to select appropriate welding methods and control technologies according to different welding objects, and precisely control the welding process to achieve precision welding. Precision welding technology for device packaging and assembly in the field of microelectronics, also known as micro-welding technology, its main purpose is to pursue th...

AI Technical Summary

Problems solved by technology

[0004] The traditional micro-arc spot welding technology cannot know the melting amount of the workpiece, and because the initial state of the workpiece is generally different, the current output by the micro-arc spot welding power supply cannot reflect the actual melting of the workpiece Due to the large amount of welding, the welding effect fluctuates greatly, the control precision is low, and the inside of the welded joint is not reliable, and the external shape is not smooth enough.

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