The impact toughness of novel keyhole TIG welded duplex stainless steel joints

Cui, Shuwan; Shi, Yonghua; Cui, Yanxin; Zhu, Tao

doi:10.1016/j.engfailanal.2018.08.009

Cited by 38 publications

(10 citation statements)

References 13 publications

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“…Keyhole tungsten inert gas (K-TIG) welding is a kind of high-energy beam welding method. It can be welded in a single-pass welding and formed on both sides without filling the welding material [ 10 , 11 , 12 , 13 , 14 ]. In this paper, different welding speeds were applied to analyze the influence of cooling rate on morphology, mechanical properties, and microstructure of the 2205 DSS welds.…”

Section: Introductionmentioning

confidence: 99%

Influence of Welding Speeds on the Morphology, Mechanical Properties, and Microstructure of 2205 DSS Welded Joint by K-TIG Welding

Cui

Pang

Pang³

et al. 2021

Materials

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In this paper, 8.0 mm thickness 2205 duplex stainless steel (DSS) workpieces were welded with a keyhole tungsten inert gas (K-TIG) welding system under different welding speeds. After welding, the morphologies of the welds under different welding speed conditions were compared and analyzed. The microstructure, two-phase ratio of austenite/ferrite, and grain boundary characteristics of the welded joints were studied, and the microhardness and tensile properties of the welded joints were tested. The results show that the welding speed has a significant effect on the weld morphology, the two-phase ratio, grain boundary misorientation angle (GBMA), and mechanical properties of the welded joint. When the welding speed increased from 280 mm/min to 340 mm/min, the austenite content and the two-phase ratio in the weld metal zone (WMZ) decreased. However, the ferrite content in the WMZ increased. The proportion of the Σ3 coincident site lattice grain boundary (CSLGB) decreased as the welding speed increased, which has no significant effect on the tensile strength of welded joints. The microhardness of the WMZ and the tensile strength of the welded joint gradually increased when the welding speed was 280–340 mm/min. The 2205 DSS K-TIG welded joints have good plasticity.

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Section: Introductionmentioning

confidence: 99%

Influence of Welding Speeds on the Morphology, Mechanical Properties, and Microstructure of 2205 DSS Welded Joint by K-TIG Welding

Cui

Pang

Pang³

et al. 2021

Materials

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“…The influence of welding speed on the morphology and microstructure of welded joints were studied. And draw the following conclusions: In DSS materials, the cooling rate also affects the two-phase balance [21][22][23]. When the welding speeds were 280-340 mm/min, the austenite content of the WMZ were 44.8%, 42.1%, 37.4% and 32.7%, respectively.…”

Section: Discussionmentioning

confidence: 82%

Numerical Simulation and Experimental Investigation on 2205 Duplex Stainless Steel K-TIG Welded Joint

Cui

Pang

Pang³

et al. 2021

Metals

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In this paper, 8 mm thickness 2205 duplex stainless steel (DSS) plates were successfully welded using keyhole tungsten inert gas welding (K-TIG) welding, and numerical simulations were performed applying the finite element method. Three models of combined heat source were adopted to verify accuracy of experiment. The welding process under different welding speeds were simulated, and the temperature field, molten pool shape, and thermal cycle curve were calculated. The welding simulation results show that a combined model consisting of the ellipsoid heat source and the conical heat source is more suitable for K-TIG welding. The results of the microstructure analysis of the welded joint showed that when the welding speed was increased from 280 mm/min to 340 mm/min, the austenite content and the ferrite and austenite grain size decreased. The evolution laws of welded joint morphologies, microstructure and grain sizes under different welding speed conditions were consistent with the analysis results of simulated molten pool morphologies, temperature field distributions and thermal cycle curves. It is proved that this kind of simulation method can effectively simulate the K-TIG welding process and ensure the welding quality, which is a guide for industrial applications.

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“…The impact toughness values of the BM and WM in the ULK-TIG welded joint are shown in Figure 3. To compare the impact toughness of ULK-TIG WM (underwater WM) with the impact toughness of onshore K-TIG WM (onshore WM), the impact toughness of onshore WM was obtained from previous research [13], and is also presented in Figure 3. The mean values of impact toughness in the BM and underwater WM were 261.7 J/cm 2 and 168.7 J/cm 2 , respectively, while the mean value of impact toughness for onshore WM was 216.3 J/cm 2 .…”

Section: Resultsmentioning

confidence: 99%

“…SEM fracture surfaces of the ULK-TIG welded joint after Charpy impact tests. ( a ) BM, ( b ) underwater WM and ( c ) onshore WM [13]. …”

Section: Figurementioning

confidence: 99%

Microstructure and Impact Toughness of Local-Dry Keyhole Tungsten Inert Gas Welded Joints

et al. 2019

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In this paper, the microstructure and impact toughness of a S32101 duplex stainless steel underwater local-dry keyhole tungsten inert gas welded joint were studied. The impact toughness value of the underwater weld metal reached 78% of the onshore weld metal, which is in accordance with the underwater welding standards. The proportion of austenite in the underwater weld metal was 0.9% lower than that of the onshore weld metal. The proportion of the Σ3 coincidence site lattice boundaries and random phase boundaries in the underwater weld metal, which significantly influence the impact toughness of the weld metal, were smaller than that of the onshore weld metal.

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The impact toughness of novel keyhole TIG welded duplex stainless steel joints

Cited by 38 publications

References 13 publications

Influence of Welding Speeds on the Morphology, Mechanical Properties, and Microstructure of 2205 DSS Welded Joint by K-TIG Welding

Influence of Welding Speeds on the Morphology, Mechanical Properties, and Microstructure of 2205 DSS Welded Joint by K-TIG Welding

Numerical Simulation and Experimental Investigation on 2205 Duplex Stainless Steel K-TIG Welded Joint

Microstructure and Impact Toughness of Local-Dry Keyhole Tungsten Inert Gas Welded Joints

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