Investigation of the effect of current intensity and frequency in PC-GTAW on microstructural evolutions of weld joints of Hastelloy B-2 superalloy

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khalasi dezfuli mehdi; ghobeiti hasab mehdi; Heidary Moghadam ali

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Journal: JOURNAL OF NEW MATERIALS Year:2019 | Volume:10 | Issue:1 (37) Page(s): 1-18

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Title

Investigation of the effect of current intensity and frequency in PC-GTAW on microstructural evolutions of weld joints of Hastelloy B-2 superalloy

Author(s)

khalasi dezfuli mehdi | ghobeiti hasab mehdi | Heidary Moghadam ali | Issue Writer Certificate

Keywords

Hastelloy B-2Q1

gas tungsten arc welding (GTAW)Q1

welding current and frequencyQ1

MicrostructureQ1

Abstract

The welding of Hastelloy B-2 Ni-Mo base superalloy was carried out with the aim of investigating the effect of current intensity and frequency on the microstructural evolutions of the welded areas. For this purpose, the PC-GTAW process and the ERNiCrMo-2 filler metal was used. While other parameters were kept constant in this process, the frequency was changed at 10, 30 and 50 Hz, and pulse current was changed in the form of 80: 20 and 60: 40. The effect of current intensity and frequency on the Microstructure of the weld metal was investigated by optical microscopy, scanning electron microscopy and EDS accessory was employed for analyzing the precipitates formed. The results showed that a decrease in the maximum current intensity led to a reduction in the heat input applied to the workpiece, resulting in a severe decrease in the size of the dendrites in the weld metal along with a reduction in the grain size of the HAZ and eventually, a significant decrease in the amount of molybdenum carbides in interdendritic regions of the weld metal will be resulted. By increasing the frequency led to increasing the width and the depth of weld. With increasing the frequency, the overlapping of the pulses increases and the heat is applied the molten pool at a shorter time interval and thus, the weld dimensions increase. The microstructural studies showed that increasing the frequency led to an increase in dendrites of the weld metal along with an increase in the extent of the HAZ.

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APA: Copy

khalasi dezfuli, mehdi, ghobeiti hasab, mehdi, & Heidary Moghadam, ali. (2019). Investigation of the effect of current intensity and frequency in PC-GTAW on microstructural evolutions of weld joints of Hastelloy B-2 superalloy. JOURNAL OF NEW MATERIALS, 10(1 (37) ), 1-18. SID. https://sid.ir/paper/169852/en

Vancouver: Copy

khalasi dezfuli mehdi, ghobeiti hasab mehdi, Heidary Moghadam ali. Investigation of the effect of current intensity and frequency in PC-GTAW on microstructural evolutions of weld joints of Hastelloy B-2 superalloy. JOURNAL OF NEW MATERIALS[Internet]. 2019;10(1 (37) ):1-18. Available from: https://sid.ir/paper/169852/en

IEEE: Copy

mehdi khalasi dezfuli, mehdi ghobeiti hasab, and ali Heidary Moghadam, “Investigation of the effect of current intensity and frequency in PC-GTAW on microstructural evolutions of weld joints of Hastelloy B-2 superalloy,” JOURNAL OF NEW MATERIALS, vol. 10, no. 1 (37) , pp. 1–18, 2019, [Online]. Available: https://sid.ir/paper/169852/en

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