Hybrid laser/arc welding of 304L stainless steel tubes, part 2 – Effect of filler wires on microstructure and corrosion behavior

Yazdian, Nima; Mohammadpour, Masoud; Razavi, Reza Shoja; Kovacevic, Radovan

doi:10.1016/j.ijpvp.2018.04.005

Cited by 25 publications

(14 citation statements)

References 29 publications

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“…Yazdian et al investigated on Hybrid laser/arc welding of 304L stainless steel tubes using different filler (A308LSi and A316LSi). They observed that the filler 316LSi show superior pitting resistance with lowest unstable passive region 18 . Jagesvar at al.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical and Electrochemical Evaluation of Dissimilar low Ni SS and 304 SS using Different Filler Materials

et al. 2019

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This study investigates the effect of dissimilar metal welding of low nickel stainless steel (SS) and 304 SS employing tungsten inert gas (TIG) welding process by using three different filler materials (316L, 308L and 310 SS). Microstructural, mechanical properties and corrosion behavior in 3.5% NaCl solution was studied. The microstructural investigation revealed the formation of δ-ferrite and γ-austenite in the weld (welded by 316L and 308L filler). The Higher δ-ferrite content was found more in 316L weld zone. Whereas samples welded by 310 SS filler showed the columnar structure in the weld zone. Relatively wider heat affected zone (HAZ) was measured on Cr-Mn SS side as compared to 304 SS side. Impact fracture surface of all the welded samples exhibited dimple appearance. Corrosion studies showed better pitting corrosion resistance in 316L SS welded sample due to the beneficial effect of δ-ferrite and also the addition of molybdenum (Mo). Electrochemical impedance spectroscopy (EIS) revealed higher polarization resistance (R p) in 316L SS as compared to other fillers. Galvanic current density was found to be higher in Cr-Mn SS as compared to 304 SS when coupled with different welded samples.

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Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical and Electrochemical Evaluation of Dissimilar low Ni SS and 304 SS using Different Filler Materials

et al. 2019

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“…In some steels, up to several HAZs with different phase compositions can be distinguished [6,7,8]. Moreover, the weld metal can be modified using controlled cooling rates or using filler material [5,9], but this is not possible in the HAZs. This circumstance justifies the full heat treatment of welds of highly sensitive structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam

Kuryntsev

2019

Materials

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The effect of heat treatment of welded joints made of steel 321 on corrosion resistance, phase composition, residual stresses, and distribution of alloying elements was studied using optical microscope (OM) and scanning electron microscope (SEM), electron dispersive spectroscopy (EDS), X-ray diffraction (XRD), and intergranular corrosion testing (IGC). Samples previously obtained by the authors using defocused laser beam, which led to the formation of directionally crystallized austenite with lathy and skeletal δ-ferrite, were investigated. Based on X-ray diffraction studies in the base metal, the maximum number of peaks of various phases was presented, which decreased after exposure to the heating effect of the welding process and subsequent heat treatment. The distribution of alloying elements, in particular, Ti and Si, was significantly affected by heat treatment depending on the regimes. A spot chemical analysis showed that the nickel content differs in δ-ferrite and austenite by 1.5%–2% whereas the chromium content in these phases is not significantly different. Tests have shown that all samples have high resistance to intergranular corrosion, which can be explained by the insufficient dissolution of titanium carbides in austenite and the absence of chromium carbides formation along austenite grain boundaries, due to high cooling rates when welding by a defocused laser beam, and as a result, the high δ-ferrite content in which chromium dissolves.

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“…The measured and predicted FN using Feritscope and WRC-1992 in WM is shown in Table 14, and it clearly indicates the higher wt% of Fe with a deviation of 0.6 FN. The increase in delta ferrite in the weldment will improve the mechanical integrity of the welded joint [56]. The inverse pole figure (IPF) map, grain boundary map and grain size distribution of the BM, interface and WM zones are shown in Figs.…”

Section: Microstructural Examinationmentioning

confidence: 99%

Investigations on mechanical properties and microstructural examination of activated TIG-welded nuclear grade stainless steel

Kumar

Sankarapandian²,

Shanmugam

2020

J Braz. Soc. Mech. Sci. Eng.

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Nuclear grade austenitic stainless steel 321 contains titanium for severe corrosive conditions and is used for process equipment, aircraft exhaust manifolds and boiler shells. Taguchi-based grey relational analysis technique has been considered to optimize the input parameters for welding SS321 material using activated tungsten inert gas welding process. The optimized input parameters were identified from the multiple output responses, i.e. arc length of 3 mm, welding current of 220 Amps and welding speed of 120 mm/min (A 1 B 3 C 1). The analysis of the variance table was performed to calculate the importance of the input parameters in the weldment quality. Also, the influence of the heat input on the depth of penetration and bead width at different arc lengths has been studied. The mechanical integrity is evaluated in terms of tensile strength for base metal (BM) (621 MPa) and weld metal (WM) (624 MPa) specimens by conducting the uniaxial tensile test. The 180° bend test with WM sample revealed the ductility level and was free from fissures and cracks. Charpy impact test results depicted the toughness values of BM (123.17 J) and WM (113.46 J) samples. Microstructural investigations at the SS321 WM highlighted the existence of columnar and equiaxed dendrites in the fusion zone. Moreover, the formation of titanium carbide reduces the chances of weld decay. Ferrite number measurement shows that the amount of delta ferrite is higher in WM (5.9) than in BM (1.2). The existence of dimples and voids in the fractographic analysis of the failed specimens (tensile and impact) confirms the ductile type of failure.

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Hybrid laser/arc welding of 304L stainless steel tubes, part 2 – Effect of filler wires on microstructure and corrosion behavior

Cited by 25 publications

References 29 publications

Microstructure, Mechanical and Electrochemical Evaluation of Dissimilar low Ni SS and 304 SS using Different Filler Materials

Microstructure, Mechanical and Electrochemical Evaluation of Dissimilar low Ni SS and 304 SS using Different Filler Materials

Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam

Investigations on mechanical properties and microstructural examination of activated TIG-welded nuclear grade stainless steel

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