Hot Corrosion Studies on Gas Tungsten Arc Welded AISI 304 and AISI 4140 Dissimilar Joints
28 Nov 2012-pp 436-441
TL;DR: In this paper, hot corrosion of Gas Tungsten arc Welded (GTAW) AISI 304 and aISI 4140 dissimilar weldment exposed in air as well as molten salt environment of Na 2SO4-60%V2O5 and K2SO4 -60% NaCl are discussed.
Abstract: Hot corrosion of Gas Tungsten Arc Welded (GTAW) AISI 304 and AISI 4140 dissimilar weldment exposed in air as well as molten salt environment of Na2SO4-60%V2O5 and K2SO4-60% NaCl are discussed. Weight gain studies were done for composite specimens containing both weld metal and heat-affected zone. The results indicated that the specimens were more corroded in molten salt environment as compared to air oxidation. Also weld interface of the samples showed more attack than base metals.
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TL;DR: In this paper, the behavioural aspects of similar and dissimilar metal joints of ASME SA 213 GR. T11 and BS 3059:1987 PT 1 ERW 320 were investigated under torsional loading.
Abstract: Tungsten Inert Gas (TIG) welding has been learnt to be the most widely used technique among the fusion welding techniques. Welding of different components of boilers is preferably accomplished by TIG welding, due to the process capabilities of the technique to produce sound joints, even in case of Dissimilar Metal Joints (DMJ). DMJs owing to the techno-economic advantages, find vast area of application especially in boiler fabrication industry. It has been learnt that the quality of welded joints is signified by mechanical properties of the joint. The present paper is focused on the behavioural aspects of similar and dissimilar metal joints of ASME SA 213 GR. T11 and BS 3059:1987 PT 1 ERW 320, the boiler steam tube materials, prepared by TIG welding under torsional loading. It has been observed that the dissimilar metal joint has performed better than the individual similar metal joints under torsional loading by achieving 85% of the torsion strength of one of the parent metal, whereas in the case of individual similar metal joints of ASME SA213 Gr. T11 and BS3059:1987 PT1 ERW320, 78% and 68% of the torsion strength of respective parent metals has been observed. ANOVA statistics have validated the existence of significant impact of input process variables on the output quality measure of the welded joint at 95% level of confidence. The predictive models for optimum torsional strength have been proposed by regression analysis.
References
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TL;DR: In this paper, high temperature corrosion tests were performed on low-alloyferritic steel and austenitic stainless steel, five high velocityoxy -fuel (HVOF) coatings, a laser cladding, and a diffusion chromized steel.
220 citations
TL;DR: In this article, the microstructure and mechanical properties of AISI 304 stainless steel and low alloy steel joints by Gas Tungsten Arc Welding, Electron Beam Welding (EBW), and Friction Welding were investigated.
219 citations
TL;DR: In this paper, the mechanical properties of borides formed on AISI H13 hot work tool and AisI 304 stainless steels have been investigated, and the boride layer has a flat and smooth morphology in 304 steel while H13 steel was a ragged morphology.
156 citations
TL;DR: In this paper, Ni 3 Al coatings were obtained on boiler tube steels through a plasma spray process and they were used as a bond coat before applying Ni 3Al coatings.
Abstract: Ni 3 Al coatings were obtained on boiler tube steels through a plasma spray process. Ni–Cr–Al–-Y was used as a bond coat before applying Ni 3 Al coatings. Characterisation and hot corrosion behaviour of coatings after exposure to air and molten salt at 900 °C were studied under cyclic conditions. The Ni 3 Al coating was very effective in decreasing the corrosion rate in air and molten salt at 900 °C in the case of ASTM-SA210 grade A1 and ASTM-SA213-T-11 types of steel. whereas the coating was least effective for ASTM-SA213-T-22 steel. Uncoated ASTM-SA213-T-22 steel showed very poor resistance to hot corrosion in molten salt environment, with spalling of the oxide scale.
127 citations
TL;DR: In this article, the weldability of AISI 304 austenitic stainless steel to AisI 4340 steel joined by friction welding in different rotational speeds and fatigue behaviour of friction-welded samples were investigated.
Abstract: In the presented study, The weldability of AISI 304 austenitic stainless steel to AISI 4340 steel joined by friction welding in different rotational speeds and fatigue behaviour of friction-welded samples were investigated. Tension tests were applied to welded parts to obtain the strength of the joints. The welding zones were examined by scanning electron microscopy (SEM) and analyzed by energy dispersive spectroscopy (EDS). The Vickers microhardness distributions in welding zone were determined. Fatigue tests were performed using a rotational bending fatigue test machine and the fatigue strength has been analysed drawing S-N curves and critically observing fatigue fracture surfaces of the tested samples. The experimental results indicate that mechanical properties and microstructural features are affected significantly by rotation speed and the fatigue strength of friction-welded samples decrease due to chromium carbide precipitation in welding zone with increasing rotation speed in choosen conditions.
61 citations