Autogenous Tungsten Inert Gas Welding of 430 Ferritic Stainless Steel: The Effect of Inter-pass Temperature on Microstructure Evolution and Mechanical Properties

2020 ◽  
Vol 29 (12) ◽  
pp. 7807-7820
Author(s):  
Mohammad Ali Mousazadeh ◽  
Reza Derakhshandeh-Haghighi
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Microstructure Evolution ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding

Microstructural evolution and properties of tungsten inert gas and fiber laser welded SUS445 ferritic stainless steel

2021 ◽  
Vol 112 (9) ◽  
pp. 687-694
Author(s):  
Ching-Wen Lu ◽  
Huei-Sen Wang ◽  
Chih-Chun Hsieh ◽  
Jie-Jyun Wu
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Fiber Laser ◽  
Ferritic Stainless Steel ◽  
Heat Affected Zone ◽  
Volume Fraction ◽  
Inert Gas ◽  
Laves Phases ◽  
Welding Processes

Abstract To determine the weldability of SUS445 ferritic stainless steel, two welding approaches, tungsten inert gas and fiber laser welding processes, were used and compared. After the welding processes, the microstructure, mechanical properties, and corrosion resistance of the welds were investigated. In the weld fusion zones of these two welding approaches, different morphologies of the grains were obtained. No obvious precipitation formed in these zones. In the heat affected zone of the tungsten inert gas welds, more volume fraction and larger grain sizes of the Laves phase and larger matrix grains were observed, which significantly affected its corrosion resistance and mechanical properties. However, in the heat affected zone of the fiber laser welds, only small amounts Laves phases and a relatively narrow matrix grain growth area were observed, which offers better corrosion resistance and mechanical properties.

scholarly journals Effects of ATIG Welding on Weld Shape, Mechanical Properties, and Corrosion Resistance of 430 Ferritic Stainless Steel Alloy

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 404 ◽  
Author(s):  
Kamel Touileb ◽  
Abousoufiane Ouis ◽  
Rachid Djoudjou ◽  
Abdeljlil Chihaoui Hedhibi ◽  
Hussein Alrobei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Ferritic Stainless Steel ◽  
Welding Process ◽  
Tig Welding ◽  
Inert Gas ◽  
Steel Alloy ◽  
Stainless Steel Alloy ◽  
Mechanical Properties And Corrosion

Flux activated tungsten inert gas (ATIG) welding is a variant of tungsten inert gas (TIG) welding process with high production efficiency, high quality, low energy consumption, and low cost. The study of activating flux mechanism by increasing weld penetration has direct significance in developing flux and welding process. This study has been conducted on 430 ferritic stainless steel alloy. Design of experiment is used to get the best formulation of flux. Based on Minitab17 software, nineteen compositions of flux were prepared using the mixing method. Fluxes are combinations of three oxides (MoO3-TiO2-SiO2). Using the optimizer module available in Minitab 17 software, the best formulation was obtained to achieve the best weld depth. Hence, the obtained depth is twice greater than that achieved by conventional TIG welding. Moreover, mechanical properties and corrosion resistance have been investigated for TIG and ATIG welds respectively in tensile, impact, and hardness tests, and in potentiodynamic polarization measurement test.

The Experiences of Activated Tungsten Inert Gas (ATIG) Welding Applied on 1.4301 Type Stainless Steel Plates

2007 ◽  
Vol 537-538 ◽  
pp. 63-70 ◽  
Author(s):  
Tamás Sándor ◽  
János Dobránszky
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Tig Welding ◽  
Steel Plates ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding ◽  
Tungsten Electrode ◽  
High Productivity ◽  
Activating Flux ◽  
Type Stainless Steel

The TIG welding has a high disadvantage against the substantially high productivity welding procedures. This is why there were continuously going on several trials to improve the productivity of the TIG welding. The Activated Tungsten Inert Gas welding (ATIG welding) is one of these trials. Application experiments of ATIG welding on austenitic stainless steel plates will be presented. The main problems which appear when using the ATIG welding are the choosing of tungsten electrode, the suggested fitting of parts for the joining, portioning of the activating flux and the sensitivity for the measure of flux. They are extremely important to apply the ATIG welding and the results will be presented by this work. In the second half of this paper the comparison of the productivity differences between TIG and ATIG welding; mechanical properties, microstructure and corrosion resistance of welded joints will continue. Finally the evaluating the results and trying to classify the ATIG welding amongst the modern and most productive welding procedures is detailed. Furthermore advises for using the ATIG welding for suitable applications are represented.

Experimental Investigations for Reducing Effect of Sensitization in Tungsten Inert Gas Welding

2008 ◽  
Author(s):  
Rupinder Singh ◽  
Sehijpal Singh
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Inert Gas ◽  
Experimental Investigations ◽  
Welding Parameters ◽  
Work Piece ◽  
Tungsten Inert Gas Welding ◽  
Stainless Steel 316L

Stainless steels are considered to have very good resistance to general and localized corrosion due to their chromium content. This property of corrosion resistance constitutes the main criterion for selecting austenitic grades of steels for service in the chemical, nuclear and aerospace industries although their mechanical properties are relatively modest. However, this resistance can degrade when structural components manufactured from these steels are used in a chemically aggressive environment, especially when service involves exposure to high temperatures like in welding. This exposure gives rise to precipitation of chromium carbides producing chromium depletion at grain boundaries that brings about the inter-granular corrosion or sensitization of these materials. Austenitic stainless steel (316L) is one of the corrosion resistance material used extensively in the oil production, chemical and power generation industries for transportation and reservoir of corrosive products. In spite of its corrosion resistance property there exist severe problems of sensitization. In the present work an effort has been made to reduce the effect of sensitization in Tungsten Inert Gas welding of Austenitic stainless steel (316L). Three welding procedures (namely conventional, back step and skip welding) in Tungsten Inert Gas welding have been used to control exposure time of the weld pool to higher temperatures, in order to study the effect of sensitization on mechanical properties (such as tensile strength, yield strength, percentage elongation and hardness). The results of this study suggested that the better mechanical properties were attained by the skip welding procedure and recommended welding parameters are 90 Amp current and 10 L/min of gas flow rate for a 5 mm thick work piece. Noticeable change in amount/extent of sensitization was observed using a scanning electron microscope (SEM) analysis within the various welding specimens prepared using the various procedures. Further mechanical properties (like strength and hardness) have been correlated with the extent of sensitization, which show remarkable decreases when the amount/extent of sensitization increases.

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