Effects of Shielding Gas Pureness on Quality of Orbital TIG Welded Austenitic Stainless-Steel Joints

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Jacek Górka ◽  
Bernard Wyględacz ◽  
Marcin Żuk
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Flow Rate ◽  
Gas Flow ◽  
Welded Joint ◽  
Relative Pressure ◽  
Delta Ferrite ◽  
Additional Material ◽  
Technology Institute

Aim of this research was determination of effects of shielding and backing gas pureness on quality of welded joints produced from austenitic stainless-steel grade X5CrNi18-10 (1.4301) pipes Ø 50.8 x 1.5 mm by orbital TIG welding without use of additional material. In the case of stainless steel, it is of importance not only to prepare shielding of the molten metal pool but as well protection of welded joint root from oxygen, which causes formation of colorful oxide layers. Presence of oxidized layer primarily decreases corrosion resistance of stainless-steel. Performed examination included: chemical composition of welded join material, delta ferrite testing, non-destructive joint testing, visual testing with discoloration assessment from face and root side (acc. to Danish Force Technology Institute report 93.34 and American ASME BPE-2012 norm), radiographic testing, destructive welded joint testing. Metallurgical shielding of the welded joint face was produced with Argon 5.0 pure, with a flow rate of 8 dm3/min. Root of welded joint was at first protected with Argon 5.0 pure, then argon-atmospheric air mixtures were used. Backing gas flow rate was set to achieve a relative pressure of 300 Pa. Quantity of residual oxygen in gas mixture was selected based on Danish Force Technology Institute report 93.34.

scholarly journals Evaluation of Stainless Steel AISI 316Ti Corner Joints Quality Produced by Tungsten Inert Gas Welding

TEM Journal ◽  
2020 ◽  
pp. 1475-1479
Author(s):  
Dominika Botkova ◽  
Frantisek Botko ◽  
Zuzana Mitalova ◽  
Vladimir Simkulet ◽  
Maros Somsak
Keyword(s):  
Stainless Steel ◽  
Welded Joint ◽  
Welding Current ◽  
Inert Gas ◽  
Optimal Conditions ◽  
Tungsten Inert Gas Welding ◽  
Additional Material ◽  
Steel Aisi ◽  
Stainless Steel Aisi

Welding is one of the most common ways of creating permanent joints in various industries. It is important to constantly look for ways to increase the quality of welds and look for optimal conditions to achieve a quality joint. The presented article is focused on the evaluation of the quality of weldments made of AISI 316Ti material created by TIG technology with additional material and without additional material. The parameter that changed was the welding current. HV hardness measurements and macroscopic weld evaluation were used to evaluate the quality of the welded joint.

Influence of microstructure and roughness level on corrosion resistance of the austenitic stainless steel welded joint

2021 ◽  
Author(s):  
Jovanka Kovačina ◽  
Bore Jegdić ◽  
Bojana Radojković ◽  
Dunja Marunkić ◽  
Sanja Stevanović ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Welded Joint

Investigation on Impact Energy of S30403 Austenitic Stainless Steel at Different Temperatures

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Zhiwei Chen ◽  
Caifu Qian ◽  
Guoyi Yang ◽  
Xiang Li
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cross Section ◽  
Test Temperature ◽  
Impact Energy ◽  
Welded Joint ◽  
Charpy Impact ◽  
Base Plate ◽  
Charpy Impact Energy ◽  
The Impact

In this paper, a series of impact tests on S30403 austenitic stainless steel at 20/−196/−269 °C were performed to determine the effects of cryogenic temperatures on the material properties. Both base plate and welded joint including weld and heat-affected zone were tested to obtain the Charpy impact energy KV2 and lateral expansion rate at the cross section. It was found that when the test temperature decreased from 20 °C to −196 °C or −269 °C, both the Charpy impact energy KV2 at the base plate and welded joint decreased drastically. Specifically, the impact energy KV2 decreased by 20% at the base plate and decreased by 54% at the welded joint from 20 °C to −196 °C, but the impact energy of base plate and welded joint did not decrease, even increased when test temperature decreased from −196 °C to −269 °C. Either at 20 °C or −196 °C, the impact energy KV2 with 5 × 10 × 55 mm3 specimens was about 0.53 times that of the 7.5 × 10 × 55 mm3 specimens, much lower than 2/3, the ratio of two specimens’ cross section areas.

Analysis of crack tip transformation zone in austenitic stainless steel laser-MIG hybrid welded joint

2017 ◽  
Vol 132 ◽  
pp. 260-268 ◽  
Author(s):  
Rong Chen ◽  
Ping Jiang ◽  
Xinyu Shao ◽  
Gaoyang Mi ◽  
Chunming Wang
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Welded Joint ◽  
Crack Tip ◽  
Transformation Zone

Improving the quality of centrifugal cast pipes made of austenitic stainless steel

2018 ◽  
Author(s):  
E. N. Eremin ◽  
G. N. Minnekhanov ◽  
R. G. Minnekhanov
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel

Probabilistic Models of Reliability of Cast Austenitic Stainless Steel Piping

2011 ◽  
Author(s):  
Haiyang Qian ◽  
David Harris ◽  
Timothy J. Griesbach
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Tensile Properties ◽  
Nuclear Power ◽  
Power Plants ◽  
Probabilistic Models ◽  
Probabilistic Approach ◽  
Delta Ferrite ◽  
Steel Piping

Thermal embrittlement of cast austenitic stainless steel piping is of growing concern as nuclear power plants age. The difficulty of inspecting these components adds to the concerns regarding their reliability, and an added concern is the presence of known defects introduced during the casting fabrication process. The possible presence of defects and difficulty of inspection complicate the development of programs to manage the risk contributed by these embrittled components. Much work has been done in the past to characterize changes in tensile properties and fracture toughness as functions of time, temperature, composition, and delta ferrite content, but this work has shown a great deal of scatter in relationships between the important variables. The scatter in material correlations, difficulty of inspection and presence of initial defects calls for a probabilistic approach to the problem. The purpose of this study is to describe a probabilistic fracture mechanics analysis of the maximum allowable flaw sizes in cast austenitic stainless steel piping in commercial power reactors. Attention is focused on fully embrittled CF8M material, and the probability of failure for a given crack size, load and composition is predicted considering scatter in tensile properties and fracture toughness (fracture toughness is expressed as a crack growth resistance relation in terms of J-Δa). Random loads can also be included in the analysis, with results generated by Monte Carlo simulation. This paper presents preliminary results for CF8M to demonstrate the sensitivity of key input variables. The outcome of this study is the flaw sizes (length and depth) that will fail with a given probability when a given load is applied.

Tests and Discussions on the Impact Work of the S30403 Austenitic Stainless Steel at 20°C and -196°C

2013 ◽  
Author(s):  
Zhiwei Chen ◽  
Guoyi Yang ◽  
Caifu Qian ◽  
Xiang Li ◽  
Haoyang Wang
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cross Section ◽  
Heat Affected Zone ◽  
Welded Joint ◽  
Base Plate ◽  
Testing Environment ◽  
Impact Tests ◽  
The Impact

In this paper, impact tests on the S30403 austenitic stainless steel at 20°C as well as −196°C were carried out. Both base plate and welded joint including weld and heat-affected zone are tested to measure the impact work KV2. It is found that when the temperature of the testing environment is decreased from 20°C to −196°C, both the impact work KV2 for the base plate and welded joint are decreased remarkably. Specifically, the impact work KV2 for the base plate decreases by 19–29% while that for the welded joint decreases by as much as 53.8%. In addition, impact tests with different size of specimens show the impact work KV2 with 5×10×55mm specimens is about 0.53–0.54 times that with 7.5×10×55mm specimens, much lower than 2/3, the ratio of two specimens’ cross section areas, indicating that rules in relevant steel or equipment standards regarding impact tests using small specimens need to be revised.

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