چکیده مقاله
P460NH micro alloy steel is used in applications such as boilers and pressure vessels Different welding processes and fillers can be used to weld this steel In this study,manual arc welding process SMAW with E8018 G electrode and tungsten arc weldingprocess with argon shielding gas TIG with ER80S G welding wire were used and toobtain optimal welding parameters, according to ASME standards IX, welding wasperformed Then, by sampling from the welding section, the corrosion behavior of theaffected areas of heat, welding pollen and base metal was investigated separately usingTafel polarization test in 3 5% NaCl solution Evaluation of corrosion behavior ofdifferent regions also showed that in tungsten arc welding with argon shielding gas withER80S G welding wire, the weld metal has the highest corrosion potential 0 689 volts and the lowest corrosion current density 5 4× 10 5 amps per square centimeter And thebase metal with corrosion potential 0 693 V has the highest corrosion current density 1 2 × 10 5 amps per square centimeter compared to the weld metal and the area affectedby heat This is despite the fact that the microstructure ofthe base metal is ferrite pearliteand it can be found in the weld metal area and the heat affected area of those types, suchas acicular ferrite, polyhedral ferrite, grain boundary ferrite GBF and Wiedmannstattenferrite WF observed According to the obtained results of the corrosion potential, theweld metal and the base metal are in a nobler position compared to the heat affected area,and the corrosion current density has increased from the base metal to the weld metal,respectively, and has reduced the polarization resistance to So that the weld metal has thehighest corrosion current density and the lowest polarization resistance These changeshave also been achieved with the increase of needle ferrite, which can be justified by theincrease of needle ferrite in the weld metal area and the heat affected area compared tothe base metal, the increase in the corrosion current density
کلیدواژهها
نویسندگان
Hossein Tahmasebi Manesh
Hossein Tahmasebi Manesh, Malek Ashtar University of Technology, Iran
Alireza Nasresfahani
Alireza Nasresfahani, Malek Ashtar University of Technology،Iran
شیوه ارجاع
Tahmasebi Manesh, Hossein and Nasresfahani, Alireza,1401,Investigating the microstructure and uniform corrosion of P460NHsteel welded using TIG welding process,5th International Conference on Welding and Non Destructive Testing & 23rd National Conference on Welding & Inspection & 12th National Conference on NDT,Isfahan
ارائهشده در
مجموعه مقالات پنجمین کنفرانس بین المللی جوشکاری و آزمایش های غیرمخرب،بیست و سومین کنفرانس ملی جوش و بازرسی و دوازدهمین کنفرانس ملی آزمایش های غیرمخرب و اولین کنفرانس ملی ساخت افزایشی10 اسفند 1401 · اصفهان