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Weld forming good or bad is one of the important factors that affect the quality of welding, you want to get a good weld formation, to be based on the geometry of the groove, the appropriate choice of process parameters. Traditional welding equipment, mainly relying on operator manual online adjustment of welding parameters, and to adapt to changes in the size of the groove, adjustment difficult, poor reproducibility. Laser vision sensors to detect weld characteristics, adjust the welding parameters, according to test results in real time and can be a good solution to the problem. The GTAW welding stainless steel for the study, forming control technology based on laser vision sensing weld. First, the establishment of the the weld characteristics detection system based on MDK. According to the characteristics of structured light laser stripes, median filtering, thresholding, improved gray-scale gravity method, linear interpolation, and a series of image processing algorithms, extracted from the image of the original laser stripe centerline slope analysis method to extract welding seam feature points, calculate the amount of geometric characteristics of the groove area, groove gap. System reliability, meet the requirements of detection accuracy tests showed the standard processing groove detect arc context. Based on this design, multifunction data acquisition card, isolators, relays, etc. welding parameter control system by the PC. The GTAW process features to select the welding current, wire feed speed, welding speed as the control parameters of the existing welding power source, wire feeder and walking platform modified to achieve the requirements of computer-controlled, multi-function data acquisition card output digital switching amount of the pilot arc, the wire feed, and walk control, the output analog voltage regulating control parameters, respectively, to the relationship between the output voltage and the respective control parameters for calibration. The influence of process parameters on the weld shape from the actual application considerations, selection of welding parameters control method of the query form, through testing to determine the appropriate process parameters for different groove sizes 304 stainless steel butt welding parameter table. Finally, the use of the C programming language, based on object-oriented and modular design of the system software development. The developed system variable groove workpiece welding, comparative tests show that the system is able to adjust the welding parameters according to the changes of the groove geometry control by changing the amount of filler metal weld formation.
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