Development of automatic pre-tracking system for fillet weld based on laser trigonometry

Xiaoqin Shen; Fusheng Yu

doi:10.1117/12.572865

13 January 2005 Development of automatic pre-tracking system for fillet weld based on laser trigonometry

Xiaoqin Shen, Fusheng Yu

Proceedings Volume 5629, Lasers in Material Processing and Manufacturing II; (2005) https://doi.org/10.1117/12.572865
Event: Photonics Asia, 2004, Beijing, China

Abstract

In this paper, an automatic fillet weld pre-tracking system for welding the work piece of lorry back boards with several bend in haul automobile is developed basing on laser trigonometry. The optical measuring head based on laser-PSD trigonometry is used as position sensor. It is placed in front of the traveling direction of welding wire to get the distances from welding wire to the two side boards of the welding lines, upper board and bottom board of the fillet weld respectively. A chip of AT89S52 is used as the micro controller in this system. The AC servomotors, ball-screws and straight guide rails constitute the sliding table to take welding wire move. The laser-PSD sensors pass through the vertical board, upper board and bottom board of the fillet weld when welding wire moves and then get the distance. The laser-PSD sensors output the analog signals. After A/D conversion, the digital signal is input into AT89S52 and calculated. Then the information of the position and lateral deviation of the welding wire when welding a certain position are gotten to control welding wires. So the weld pre-tracking for welding the work piece with long distance and large bend in haul automobile is realized. The position information is input into EEPROM to be saved for short time after handled by AT89S52. The information is as the welding position information as well as the speed adjusting data of the welding wire when it welds the several bend of the work piece. The practice indicates that this system has high pre-tracking precision, good anti-disturb ability, excellent reliability, easy operating ability and good adaptability to the field of production.

Citation Download Citation

Xiaoqin Shen and Fusheng Yu "Development of automatic pre-tracking system for fillet weld based on laser trigonometry", Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); https://doi.org/10.1117/12.572865

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KEYWORDS

Sensors

Laser development

Laser welding

Analog electronics

Image processing

Signal processing

Computer programming

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