VISUAL SENSOR FOR AUTOMATIC WELD

SEAM TRACKING TO TIG WELDING

OF COPPER-CLAD ALUMINUM WIRE

LI Yunfeng^{1, 2}  ZHAO Xihua¹  LI Yongqiang¹  YI Nan³

(1.College of Material Science and Engineering, Jilin University, Changchun 130021;
2. College of Material Science and Engineering, Changchun Univesity of Technology, Changchun 130012;
3.Dalian Fushi Bimetallic Manufacturing Co. Ltd, Dalian 116100)

Abstract: Aimed at the torch departure from seam in TIG welding of copper-clad aluminum wire, a visual sensor for automatic weld seam tracking system is developed by initiative arc light. The image of copper plate opposite seam is taken 20 mm the front of the torch. In order to decrease the time of video signal processing, analog circuit is applied in the process where video signal is magnified, trimmed and processed into binary by the datum of developing average value. Therefore, the waveform of video signal of copper plate opposite seam is obtained. The method that is used for judging the direction of warp and estimating the value of warp between copper opposite seam and tungsten electrode is established. Results show that the method is feasible to identify copper opposite seam based on visual sensor. A reliable system to real-time tracking seam of copper-clad aluminum wire TIG welding can be provided. The response cycle of this system is no more than 60 ms, and the tracking precision is less than 0.1 mm.

Key words: Visual sensor Copper-clad aluminum wire TIG welding Automatic tracking

CLC No: TG444.74 TP274

大连傅氏双金属制造有限公司资助项目. Received 20061024, received in revised form 20070414