BRUNO PIZOL INVERNIZZI
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Artigo IPEN-doc 26470 Mechanical properties for circumferential welding applied to UNS S32750 Super Duplex Stainless Steel using the GMAW process with CMT control2019 - INVERNIZZI, BRUNO P.; SILVA, LEANDRO G.; NEVES, MAURICIO D.M. dasSuper Duplex Stainless Steel has been studied for oil and gas industry applications since the 90 s, but their welding always is a technical issue. Then different methods were developed to meet all requirements presents in ASME standards, where most of are applied for lower production, when compared to other materials such carbon steel. This study accomplished circumferential welding experiments in base material (BM)—UNS S32750 Super Duplex Stainless Steel with a thickness of 3.68 mm. Welding was performed using GMAW (Gas Metal Arc Welding) process with CMT (Cold Metal Transfer) control and the aid of a Motoman robot and a turntable device, which were used to ensure the accurate positioning of the torch and that the welding has been fully implemented in the 1 G position, respectively. This process achieves higher production in relation other welding process usually applied for this material class. The joints which presented adequate dimensional results were, then, subjected to tensile and hardness Vickers tests. To avoid the lack of penetration problem, the welding was performed using the CMT process combined with pulsed arc, thus, resulting in full penetration and improved surface finish. The results have shown that the CMT procedure, combined with pulsed arc, led to an adequate superficial finishing, mechanical properties and corrosion resistance in accomplishment with the requirements presented in applicable standards.Artigo IPEN-doc 23690 Soldagem circunferencial do aço inoxidável super duplex UNS S32750 pelo processo MIG com controle CMT2016 - INVERNIZZI, BRUNO P.; NEVES, MAURICIO D.M. dasThis study carried out circumferential welding experiments in tubes with 3.68 mm thick. Welding was performed using MIG welding equipment with CMT Cold Metal Transfer® control and with the aid of Motoman robot and a turntable. This was to ensure the accurate positioning of the torch and that the welding was fully implemented in the 1G position, respectively. The weld joints were then evaluated visually, and the joints which present fully penetration were then subjected to tensile testing, microhardness Vickers test and metallography. The welding performed, has shown a lack of penetration for all parameters performed when welded by CMT conventional process. To avoid this problem, the weld was performed using the CMT process combined with pulsed arc, thus creating greater energy during welding, resulting in full penetration and improved surface finish. For this process which has provide fully penetration, the mechanical tests and the metallographic tests were performed and has present adequate results.