Duration in the range of tens – a few hundreds of microseconds. The pulse duration, repetition rates are configurable. Metal wires or sheets pressed between the electrodes will be soldered.Ī burst of short pulses are sent to the electrodes to generate plasma and cut thin metal foils. Video showing spot welding will follow soon.Ī predefined (uC+LCD+controls) high current pulse is delivered to the two electrodes, when the trigger button is pressed. Schematics, Microcontroller software, PCB layout to be added. I will probably use a Car Audio capacitor. 60000uFarad, but I need to get close to 1 Farad to have enough energy for correct operation. I plan to try manufacturing them our of Graphite or Tungsten. The molten material sticks to the discharge electrodes, making the operation difficult. Here is one of the construction tests, where I cut a beer can:
A single mosfet is rated for 75V 209Amps and an extremely low Rds. The power switch is handled by 5 power mosfets, IRFP2907, set in parallel and driven by a darlington array IC with further transistor amplification. It can be used for spot welding and for plasma cutting. The logic and the precise timing (of the order of micro-seconds) is controlled by an AtMEGA16-16PU microcontroller running at 16MHz. It stores energy into a huge capacitor bank, and discharges it via two electrodes in the given target, regularly metal foils/sheets. I’ve just completed the first tests of a new challenging project, a pulsed discharge micro spot welder and cutter tool. , Power supply and some innovative electrodes
#Ce freza mi se potriveste program code
The microcontroller source code for the Dual Pulse Welder/Cutter is included at the bottom part of this article.
This article is structured on several parts, the bottom containing the final results. This project took a lot of time to complete. This project is based on Jiri Pittner’s welder for the Atmega16, and so the source code (Below) is released under GPL. The circuit diagram and complete source code is available at the bottom of this article. The Capacitor discharge microspot welder has been featured on HaD, see it here.
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