Experimental Study of the Temperature Distribution in Welded Thin Plates of Duplex Stainless Steel for Automotive Exhaust Systems

Betini, Evandro Giuseppe; Cione, Francisco C.; Mucsi, Cristiano Stefano; Colosio, Marco Antonio; Rossi, Jesualdo Luiz; Orlando, M. T. D.

doi:10.4271/2016-01-0503

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…In the process of regular welding, the cooling rate is accelerated; thus, the ferrite-austenite alteration cannot be completed, and some δ-ferrite is kept at room temperature after solidification. High input heat leads to a low cooling rate, which further contributes to the change from delta-ferrite phase to austenite phase in weld metal with stainless steel [39][40][41]. Consequently, the duplex δ + γ structure will be the definitive composition of the weld metal of ASS [42][43][44][45].…”

Section: Duplex Structurementioning

confidence: 99%

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Mohammed

Ishak

Aqida

et al. 2017

Metals

103

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Abstract:The effects of input heat of different welding processes on the microstructure, corrosion, and mechanical characteristics of welded duplex stainless steel (DSS) are reviewed. Austenitic stainless steel (ASS) is welded using low-heat inputs. However, owing to differences in the physical metallurgy between ASS and DSS, low-heat inputs should be avoided for DSS. This review highlights the differences in solidification mode and transformation characteristics between ASS and DSS with regard to the heat input in welding processes. Specifically, many studies about the effects of heat energy input in welding process on the pitting corrosion, intergranular stress, stress-corrosion cracking, and mechanical properties of weldments of DSS are reviewed.

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Section: Duplex Structurementioning

confidence: 99%

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Mohammed

Ishak

Aqida

et al. 2017

Metals

103

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“…Betini et al [6] found low value for thermal diffusivity for pure argon as shielding gas using conventional GTA welding process in heat-affected region. Matteis P. et al [7] reported the variation of the thermal diffusivity occurring in austenitic steels during the cooling process. Furthermore, it was defined that the thermal diffusivity is the most influent thermophysical property in quenching processes that can be analyzed by thermo-metallurgical models.…”

Section: Introductionmentioning

confidence: 99%

Study of the Thermal Diffusivity Variation in Thin Duplex Steel Plates Welded by GTAW Process

Betini

Gomes

Mucsi

et al. 2018

MSF

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This study describes the thermal diffusivity of thin duplex steel plates in the thickness direction measured using the laser-flash method after welding. The work reports the experimental efforts in recording temperature profiles of the grade UNS S32304 duplex steel during autogenous welding. The butt weld autogenous joints were carried out by the GTAW (gas tungsten arc welding) process with either argon or argon - 2% nitrogen atmospheres. The amount of nitrogen in the heat affected regions, after welding, was measured and correlated with the variation of the thermal diffusivity of the studied material. The temperature profiles were obtained using k-type thermocouples connected to a digital data acquisition system. Different thermal cycles and thermal diffusivity values were observed in the heat-affected zone (HAZ) for both samples. In the solidified zone (SZ) was observed similar increase of the thermal diffusivity values for the plates welded with pure argon and argon plus nitrogen atmosphere.

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“…Finally, the final microstructure depends on the parameters of welding cycles such as holding time, peak temperature, and cooling rate [6,7,8]. So, the aim of this experimental work is to optimized welding parameters in order to ensure the soundness better quality of the fabricated parts [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of the cooling rates on heat-affected zone of UNS S32304 duplex stainless steel welded by pulsed GTAW process

Betini¹,

Gomes²,

Reis³

et al. 2017

Blucher Physics Proceedings

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Two thin plates of UNS 32304 of duplex stainless steel were joined by pulsed gas tungsten arc welding (GTAW) using a mixture 98% of argon plus 2% of nitrogen as shielding gas or pure argon as purging gas at the bottom of the plate without filler metal. The temperature profile close and away from the weld pool was measured using K type (Ni-Cr) thermocouples, connected to a digital data acquisition system. The thermal cycles was recorded in the heat-affected zone (HAZ) at a distance in between 1 and 3 mm from the joint line. The cooling rate and holding time were studied with respect to the used purging gas. Experimental thermal profiles are in good agreement with literature values. The joints welded without any purging gas revealed high peak temperature and cooling rates. The present investigation showed that temperature peaks are comprised in the phase transformation temperature ranges for the welded duplex stainless steel.

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Experimental Study of the Temperature Distribution in Welded Thin Plates of Duplex Stainless Steel for Automotive Exhaust Systems

Cited by 5 publications

References 11 publications

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Study of the Thermal Diffusivity Variation in Thin Duplex Steel Plates Welded by GTAW Process

Effect of the cooling rates on heat-affected zone of UNS S32304 duplex stainless steel welded by pulsed GTAW process

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