A-TIG welding process for enhanced-penetration in Duplex stainless-steel: effect of activated fluxes

2019 ◽  
Vol 34 (15) ◽  
pp. 1659-1670 ◽  
Author(s):  
Surinder Tathgir ◽  
Dinesh W. Rathod ◽  
Ajay Batish
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Welding Process ◽  
Tig Welding ◽  
A Tig Welding

Performance of weld bead profile during A-TIG welding on nitrogen alloyed stainless steel

2021 ◽  
Author(s):  
Akash Deep ◽  
Vivek Singh ◽  
Som Ashutosh ◽  
M. Chandrasekaran ◽  
Dixit Patel
Keyword(s):  
Stainless Steel ◽  
Welding Process ◽  
Weld Bead ◽  
Tig Welding ◽  
Inert Gas ◽  
Bead Geometry ◽  
Depth Of Penetration ◽  
Weld Bead Geometry ◽  
A Tig Welding ◽  
Arc Welding Process

Abstract Austenitic stainless steel (ASS) is widely fabricated by tungsten inert gas (TIG) welding for aesthetic look and superior mechanical properties while compared to other arc welding process. Hitherto, the limitation of this process is low depth of penetration and less productivity. To overcome this problem activated tungsten inert gas (A-TIG) welding process is employed as an alternative. In this investigation the welding performance of conventional TIG welding is compared with A-TIG process using TiO2 and SiO2 flux with respect to weld bead geometry. The experimental investigation on A-TIG welding of ASS-201 grade shows TiO2 flux helps in achieve higher penetration as compared to SiO2 flux. While welding with SiO2 the hardness in HAZ and weld region higher than that of TIG welding process.

scholarly journals Comparison between PCA analysis and Grey based Taguchi analysis of TIG welding process parameters on Duplex stainless steel

2021 ◽  
pp. 67-74
Author(s):  
Sandip Mondal ◽  
Goutam Nandi ◽  
Pradip Kumar Pal
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Process Parameters ◽  
Gas Flow ◽  
Welding Process ◽  
Principal Component ◽  
Welding Current ◽  
Tig Welding ◽  
Welding Parameters ◽  
Welding Quality

Tungsten inert gas (TIG) welding on Duplex stainless steel (DSS) is more easy, comfortable and useful, if the process is precisely understood and controlled through development of the science & technology. TIG welding on DSS has been performed with the help of specific controlled welding process parameters. Welding quality has been strongly depended on these process parameters. In this study, some valuable welding parameters are chosen. These are welding current, shielding gas flow rate and speed of welding. These process parameters of TIG welding for ASTM/UNS 2205 DSS welds are optimized by using Principal Component Analysis (PCA) method and Grey based Taguchi’s L9 Orthogonal array (OA) experimental plan with the conception of signal to noise ratio (N/S). After that, compression results of above mentioned two analyses of TIG welding process parameters have been calculated. The quality of the TIG welding on DSS has been evaluated in term of ultimate tensile strength, yield strength and percentage of elongation. Compression results of both analyses indicate application feasibility for continuous improvement of welding quality on DSS in different components of chemical, oil and gas industries.

scholarly journals Numerical Simulation and Experimental Investigation on 2205 Duplex Stainless Steel K-TIG Welded Joint

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1323
Author(s):  
Shuwan Cui ◽  
Shuwen Pang ◽  
Dangqing Pang ◽  
Qin Zhang ◽  
Zhiqing Zhang
Keyword(s):  
Stainless Steel ◽  
Temperature Field ◽  
Heat Source ◽  
Duplex Stainless Steel ◽  
Welding Speed ◽  
Molten Pool ◽  
Thermal Cycle ◽  
Welded Joint ◽  
Welding Process ◽  
Tig Welding

In this paper, 8 mm thickness 2205 duplex stainless steel (DSS) plates were successfully welded using keyhole tungsten inert gas welding (K-TIG) welding, and numerical simulations were performed applying the finite element method. Three models of combined heat source were adopted to verify accuracy of experiment. The welding process under different welding speeds were simulated, and the temperature field, molten pool shape, and thermal cycle curve were calculated. The welding simulation results show that a combined model consisting of the ellipsoid heat source and the conical heat source is more suitable for K-TIG welding. The results of the microstructure analysis of the welded joint showed that when the welding speed was increased from 280 mm/min to 340 mm/min, the austenite content and the ferrite and austenite grain size decreased. The evolution laws of welded joint morphologies, microstructure and grain sizes under different welding speed conditions were consistent with the analysis results of simulated molten pool morphologies, temperature field distributions and thermal cycle curves. It is proved that this kind of simulation method can effectively simulate the K-TIG welding process and ensure the welding quality, which is a guide for industrial applications.

A Study of the Performance of Dissimilar A-TIG Welds

2012 ◽  
Vol 530 ◽  
pp. 74-79 ◽  
Author(s):  
Hsien Kuo Cheng ◽  
Long Tsai Yao ◽  
Pin Chou Chang
Keyword(s):  
Stainless Steel ◽  
Mild Steel ◽  
316L Stainless Steel ◽  
Welding Process ◽  
Butt Joint ◽  
Tig Welding ◽  
Angular Distortion ◽  
Activating Flux ◽  
Dissimilar Welds ◽  
A Tig Welding

The performance of dissimilar activated tungsten inert gas (A-TIG) welding on the welds morphology, angular distortion, and mechanical properties in dissimilar metal plates were investigated. Autogenous TIG welding process was applied to the JIS G3131 mild steel and type 316L stainless steel through a thin layer of activating flux to produce a butt-joint weld. CaO, SiO2, Fe2O3, and Cr2O3 fluxes were used as the activating fluxes. The experimental results indicated that the SiO2, Fe2O3, and Cr2O3 fluxes can increase joint penetration in both of the 316L stainless steel and the JIS G3131 mild steel. The CaO flux only can increase the joint penetration of the mild steel. The reversed Marangoni convection are considered to the main factors for increasing penetration of A-TIG on dissimilar welds in this study. Furthermore, TIG welding with SiO2 powder can significantly reduce the angular distortion and increase the tensile strength of the dissimilar weldment.

Finite Element Simulation of A-TIG Welding of Duplex Stainless Steel 2205 Using SYSWELD

2014 ◽  
Vol 592-594 ◽  
pp. 374-379 ◽  
Author(s):  
Korra Nanda Naik ◽  
K.R. Balasubramanian ◽  
M. Vasudevan
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Temperature Distribution ◽  
Duplex Stainless Steel ◽  
Weld Bead ◽  
Tig Welding ◽  
Transient Temperature ◽  
Bead Geometry ◽  
A Tig Welding ◽  
Bead Profile

Bead on plate activated tungsten inert gas (A-TIG) welding of duplex stainless steel (DSS) 2205 was performed to determine the thermal history, temperature distribution and the weld bead geometry. Finite element (FE) simulations were carried out using the software, SYSWELD considering the temperature dependent thermal and mechanical properties of the base material. A 3D double ellipsoidal heat source was employed for the non-linear thermal analysis. The transient temperature distribution, weld bead profile, weld bead dimensions, depth of penetration and bead width were calculated by FE simulation. The simulated weld bead profile was compared with the experimentally measured profile and found to be in agreement.

scholarly journals Influence of Activated Fluxes on the Bead Shape of A-TIG Welds on Carbon and Low-Alloy Steels in Comparison with Stainless Steel AISI 304L

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 530
Author(s):  
Jerzy Niagaj
Keyword(s):  
Stainless Steel ◽  
Penetration Depth ◽  
High Strength ◽  
Tig Welding ◽  
Low Alloy Steels ◽  
Aisi 304L ◽  
A Tig Welding ◽  
Alloy Steels ◽  
Steel Aisi ◽  
Stainless Steel Aisi

The article presents results of comparative A-TIG welding tests involving selected unalloyed and fine-grained steels, as well as high-strength steel WELDOX 1300 and austenitic stainless steel AISI 304L. The tests involved the use of single ingredient activated fluxes (Cr2O3, TiO2, SiO2, Fe2O3, NaF, and AlF3). In cases of carbon and low-alloy steels, the tests revealed that the greatest increase in penetration depth was observed in the steels which had been well deoxidized and purified during their production in steelworks. The tests revealed that among the activated fluxes, the TiO2 and SiO2 oxides always led to an increase in penetration depth during A-TIG welding, regardless of the type and grade of steel. The degree of the aforesaid increase was restricted within the range of 30% to more than 200%.

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