Effect of pulse frequency on microstructure of 21% Cr ferritic stainless steel in pulsed gas tungsten arc welding

2013 ◽  
Vol 19 (2) ◽  
pp. 127-129 ◽  
Author(s):  
Shengsun Hu ◽  
Ruifeng Han ◽  
Junqi Shen ◽  
Jian Han ◽  
Haigang Xu
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Arc Welding ◽  
Pulse Frequency ◽  
Gas Tungsten Arc Welding ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

scholarly journals Grain size distribution after similar and dissimilar gas tungsten arc welding of a ferritic stainless steel

2015 ◽  
Vol 51 (1) ◽  
pp. 61-66
Author(s):  
E. Ranjbarnodeh ◽  
S. Serajzadeh ◽  
A.H. Kokabi ◽  
A. Fischer
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Size Distribution ◽  
Grain Growth ◽  
Grain Size Distribution ◽  
Ferritic Stainless Steel ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

In this study, gas tungsten arc welding of ferritic stainless steel and grain size distribution in heat affected zone of the welded samples were investigated. Both similar and dissimilar arc welding operations were considered where in dissimilar welding joining of stainless steel to mild steel was examined. In the first stage, a three-dimensional model was developed to evaluate temperature field during and after arc welding while the model was performed using finite element software, ANSYS. Then, the effects of welding heat input and dissimilarity of the joint on the weld pool shape and grain growth in HAZ of stainless steel was investigated by means of model predictions and experimental observations. The results show that the similar joint produces wider HAZ and considerably larger grain size structure while in the dissimilar welds, the low carbon part acts as an effective heat sink and prevents the grain growth in the stainless steel side as well reduces the welding maximum temperature.

Mixing of multiple metal vapours into an arc plasma in gas tungsten arc welding of stainless steel

2017 ◽  
Vol 50 (43) ◽  
pp. 43LT03 ◽  
Author(s):  
Hunkwan Park ◽  
Marcus Trautmann ◽  
Keigo Tanaka ◽  
Manabu Tanaka ◽  
Anthony B Murphy
Keyword(s):  
Stainless Steel ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Arc Plasma ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

scholarly journals Dissimilar Joining of Stainless Steel and 5083 Aluminum Alloy Sheets by Gas Tungsten Arc Welding-Brazing Process

2018 ◽  
Vol 330 ◽  
pp. 012048 ◽  
Author(s):  
Muralimohan Cheepu ◽  
B. Srinivas ◽  
Nalluri Abhishek ◽  
T. Ramachandraiah ◽  
Sivaji Karna ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloy ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Dissimilar Joining ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
5083 Aluminum Alloy

Role of welding processes on microstructure and mechanical properties of nuclear grade stainless steel joints

2019 ◽  
Vol 233 (11) ◽  
pp. 2335-2351 ◽  
Author(s):  
R Rajasekaran ◽  
AK Lakshminarayanan ◽  
M Vasudevan ◽  
P Vasantharaja
Keyword(s):  
Stainless Steel ◽  
Base Metal ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Nuclear Grade ◽  
Lower Percentage ◽  
Weld Joints ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Welding Processes

Nuclear grade 316LN austenitic stainless steel weld joints were fabricated using conventional gas tungsten arc welding (GTAW), activated flux gas tungsten arc welding (AGTAW), laser beam welding (LBW) and friction stir welding (FSW) processes. Assessment of weld beads was done by mechanical and metallurgical characterizations. Bead geometry and weld zones were studied by taking macrographs along the transverse side of the weld joints. Metallurgical features of different weld joints were carried out using optical microscopy and scanning electron microscopy. Microhardness distribution across four weld joints was recorded and hardness variations were compared. All weld zone, heat affected zone (HAZ) of GTAW and LBW, thermo-mechanically affected zone (TMAZ) of FSW processes, exhibited higher hardness values than the base metal. Reduced hardness was recorded at HAZ of AGTAW process. This was the result of a considerable grain growth. LBW joint showed the highest hardness value at the center of the fusion zone due to fine equiaxed dendrite morphology. Tensile and impact properties of different welding processes were evaluated and comparisons were made at room temperature. All weld samples displayed high yield strength (YS) and ultimate tensile strength (UTS) with a lower percentage of elongation compared to that of the base metal. FSW joint showed improved YS, UTS and impact toughness compared to other weld joints. This is attributed to the formation of strain-free fine equiaxed grains at stir zone around 5 µm in size with subgrains of 2 µm in size by severe dynamic recrystallization mechanism. Among the fusion welding techniques, AGTAW process exhibited improved toughness, besides almost equal toughness of the base metal due to low δ-Ferrite with high austenite content. Fractography studies of the base metal and different weld samples were carried out by SEM analysis and features were compared.

Study of the Effect of Active Fluxes in Gas Tungsten Arc Welding

2011 ◽  
Vol 189-193 ◽  
pp. 3579-3582
Author(s):  
Jian Hao ◽  
Zhen Luo ◽  
Xian Zheng Bu ◽  
Jian Wu Zhang
Keyword(s):  
Stainless Steel ◽  
Thin Layer ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Steel Plates ◽  
Angular Distortion ◽  
Deep Penetration ◽  
Weld Penetration ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

In order to investigate the effect of active fluxes on weld penetration, angular distortion and weld morphology in gas tungsten arc welding (GTAW), three types of oxide fluxes-CaO, TiO2and Al2O3-were used in the welding of 5mm think stainless steel plates. Those powders were applied through a thin layer of the flux to produce a bead on plate welds. The results showed that compared with conventional TIG welding, increased weld penetration and reduced angular distortion of the weld piece were obtained with the application of active fluxes. However, the weld morphology was not changed significantly when the powders were coated on the surface of steel. It was also found that each of the powders has a fittest range in penetration increment. Whether the rate of the coating run out of the range, the effects of these active fluxes on the increased weld penetration were not obvious. The CaO flux has a narrow effective range for deep penetration, while the Al2O3powder does have no effect on A-TIG penetration. The mechanism of those different performances has not been found out. According to the investment, the mechanism of active fluxes for the increased weld penetration and reduced angular distortion is related to the contraction of the arc.

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