Authors: Yoshihiro Fujita Tsuyoshi Ogawa Satoru Asai Setsu Yamamoto Tatsuya Ohdake Makoto Ochiai
Publish Date: 2013/03/19
Volume: 56, Issue: 11-12, Pages: 15-25
Abstract
The authors have developed a systematized inprocess quality control system for arc welding of thick walled pipe utilizing visual sensors and computers This system consisted of four main subsystems that monitor the welding conditions monitor the weld pool shape visualize the weld bead shape and visualize inner defects respectively The welding condition monitoring system detects abnormal welding conditions using an electric signal The weld pool shape monitoring system assesses the position among weld pool the electrode wire and groove using a charge coupled device CCD camera and filters The weld bead shape visualization system detects abnormal bead surface conditions using a threedimensional 3D visual technique The inner defect visualization system was achieved using a laserultrasonic inprocess testing LUT technique and synthesis aperture focus technique SAFT Each subsystem informs workers of unsuitable welding conditions to allow them to reestablish the suitable conditions Furthermore the inprocess quality control system was applied to thick walled pipe welding to verify the practicality of this system for improving the quality and efficiency of welding operations
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