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Research on Integrated Digital Equipment of Pulsed Tandem MIG Arc-Welding Inverter Power Source Based on DSP

Author: ChenXiaoDong
Tutor: XueJiaXiang；XuHaiBo
School: South China University of Technology
Course: Mechanical Engineering
Keywords: Two-wire inverter DSP Integrated PI control Control system
CLC: TG444
Type: Master's thesis
Year: 2011
Downloads: 51
Quote: 0
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Abstract


Twin-wire welding has much more advantages than single wire welding. Twin-wire is very efficient in welding and has a small heat input which can suit the big current circumstance.But because of its technical complexity, the research is only just beginning in China. So we put forward a two-wire high-speed digital plate welding research.Supported by the foundations of NSFC (NO.50875088), GDSTCS (2010B010700001) and HuangpuSTCS(1021), an Integrated Digital Equipment of Pulsed Tandem MIG Arc-Welding Power Source Based on DSP was developed, then tentative Tandem welding craft experiments were done based on the equipment platform.Paper first presented to TMS320F2808DSP creative for the control of the core, while two-way driver and the main control circuit, the control software using two-way waveform design work, digging in the past abandoned the use of two independent power supply to work CAN bus communication way. According to the program to complete the hardware circuit design, and development of the corresponding control system, using an incremental digital PI algorithm welding current control.The overall power source debugging was done on that platform, including the hardware debugging and the software debugging. Then the static characteristics and the instant motive characteristics were both tested, which turned out to be a satisfaction of the Tandem system designed.Finally, 45 for 8mm thick steel for a two-wire pulsed MIG welding process a series of comparative experiments, Including double wire pulse different phase, reversed-phase pulse at different current segment and double-wire three different welding current.Finally good performances and beautiful Tandem welding seams came out, at the premise of the right parameters-matching of the two output pulses.In summary, the issue of digital two-wire arc welding inverter research has made great progress in the waveform and parameter control with a good performance on both, the subject of integration of collaborative thinking on the two-wire double wire machine research has important reference value.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Arc welding
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