![]() Therefore, it is significant to recognize the actual groove position using machine vision methods and perform an accurate path teaching process. Due to machining errors, assembly errors, deformations, etc., the actual groove position may be different from the predetermined path. Zeng, Jinle Chang, Baohua Du, Dong Peng, Guodong Chang, Shuhe Hong, Yuxiang Wang, Li Shan, Jiguoįor better welding quality, accurate path teaching for actuators must be achieved before welding. The extra narrow gap weld joints have been found much superior to the weld joint prepared by multi-pass multi-seam per layer deposition in conventional groove with respect to its metallurgical characteristics and mechanical properties.Ī Vision-Aided 3D Path Teaching Method before Narrow Butt Joint Welding. Weld joint is also prepared by using commonly used multi-pass multi-seam per layer weld deposition in conventional groove. The effect of diverse pulse parameters on the characteristics of weld has been studied. The selection of parameter of pulse current gas metal arc welding is done considering a summarized influence of simultaneously interacting pulse parameters defined by a dimensionless hypothetical factor Ï The weld joints are prepared by using different combination of pulse parameters. In conjunction with this method, the narrow groove (3 bevel) was shown to provide significant technical advantages.« lessĬharacteristics of Extra Narrow Gap Weld of HSLA Steel Welded by Single-Seam per Layer Pulse Current GMA Weld Depositionīutt weld joints are produced using pulse current gas metal arc welding process by employing the technique of centrally laid multi-pass single-seam per layer weld deposition in extra narrow groove of thick HSLA steel plates. ![]() Analysis showed machine-made (automatic) gas tungsten arc welds (GTAW) as the method of choice due to cleanliness and superior mechanical properties. The utility companymore » then proceeded to determine the most effective method to complete this work. Although increased inspection was much costly, pipe replacement was chosen due to potential safety concerns with seam welded pipe even with more frequent inspection. With this in mind, the utility company evaluated replacement of the seam welded hot reheat pipe with seamless pipe or increasing the frequency of its inspection program. ![]() The overriding consideration, however, was one of safety. Alternatives were narrowed to two in dealing with the installed seam welded pipe. ![]() Southern California Edison, recognizing a potential safety concern, scrutinized its existing seam welded hot reheat pipe manufactured by the same supplier as that which failed. Replacement of seam welded hot reheat pipe using narrow groove GTA machine welding ![]() The diffusers are of a transverse width which is on the order of the thickness of the electrode so that the diffusers can, in use, be inserted into a narrow welding groove before and after the electrode in the direction of the weld operation. The diffusers extend downwardly along the torch electrode on opposite sides thereof so as to release shield gas along the length of the electrode and at the distal tip of the electrode. First and second tapered diffusers are respectively connected to the manifold sections in fluid communication with the gas passages thereof. Laterally extending manifold sections communicate with a shield gas inlet such that shield gas supplied to the inlet passes to gas passages of the manifold sections. The diffuser assembly includes a manifold adapted for adjustable mounting on the welding torch which is received in a central opening in the manifold. Narrow groove welding gas diffuser assembly and welding torchĪ diffuser assembly is provided for narrow groove welding using an automatic gas tungsten arc welding torch. ![]()
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