Localized Purging Methodology to Minimize Oxidation During Gas Tungsten Arc Welding of 304L Stainless Steel Pipes

2019 ◽  
Vol 72 (11) ◽  
pp. 2947-2951
Author(s):  
C. B. Rajeev ◽  
M. V. Kuppusamy ◽  
B. P. C. Rao
Keyword(s):  
Stainless Steel ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
304L Stainless Steel ◽  
Steel Pipes ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

The Welding Deformations of Stainless Steel Pipes With Thick Wall by Narrow Gap Gas Tungsten Arc Welding

2010 ◽  
Author(s):  
Jainxun Zhang ◽  
Chuan Liu ◽  
Jing Niu
Keyword(s):  
Stainless Steel ◽  
Arc Welding ◽  
Welding Process ◽  
Gas Tungsten Arc Welding ◽  
Thick Wall ◽  
Fe Model ◽  
Narrow Gap ◽  
Steel Pipes ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

The austenitic stainless steel pipes with thick wall are widely used in the nuclear power station and are welded by narrow gap gas tungsten arc welding process. The welding deformations of multi-pass butt-welded pipes with 65 and 70mm thickness are investigated experimentally and numerically in the paper. The transient axial deformation and axis shift deformation are measured during welding. An axisymmetric FE model and a thermal mechanical calculating procedure are presented to simulate the welding axial deformations. An effective calculating method by only considering the contraction of each welding pass in the model is proposed. The experimental results show that the axis shift deformation is very small and demonstrates an elastic movement during welding; the axial shrinkage of welded pipes is the mainly deformation, which is very significant during the first several weld pass, and decreases sharply after the weld groove has been filled at the height of 30% wall thickness that makes the stiffness of pipes large enough to resist the welding shrinkage.

Hydrogen Cracking in Gas Tungsten Arc Welding of an AIST Type 321 Stainless Steel

2015 ◽  
pp. 711-716
Author(s):  
P. Rozenak ◽  
Ya. Unigovski ◽  
R. Shneck
Keyword(s):  
Stainless Steel ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Hydrogen Cracking ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

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.

Physicochemical Characterization of Aerosol Generated in the Gas Tungsten Arc Welding of Stainless Steel

2016 ◽  
Vol 60 (8) ◽  
pp. 960-968 ◽  
Author(s):  
Mirella Miettinen ◽  
Tiina Torvela ◽  
Jari T. T. Leskinen
Keyword(s):  
Stainless Steel ◽  
Arc Welding ◽  
Physicochemical Characterization ◽  
Gas Tungsten Arc Welding ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

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

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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