Effect of Welding Parameters and Gas Composition on Ferrite Content of Austenitic Weld and Clad Metals / Der Einfluß der Schweißparameter und der Gaszusammensetzung auf den Ferritgehalt austenitischer Schweißgüter und Plattierungen

1995 ◽  
Vol 32 (6) ◽  
pp. 312-324
Author(s):  
K. Prasad Rao ◽  
V. Rama Rao
Keyword(s):  
Ferrite Content ◽  
Welding Parameters ◽  
Gas Composition ◽  
Clad Metals

scholarly journals Influence of Welding Parameters and Shielding Gas Composition on GTA Weld Shape

2005 ◽  
Vol 45 (1) ◽  
pp. 66-70 ◽  
Author(s):  
Shanping LU ◽  
Hidetoshi FUJII ◽  
Kiyoshi NOGI
Keyword(s):  
Welding Parameters ◽  
Gas Composition ◽  
Shielding Gas ◽  
Weld Shape

scholarly journals Optimization of FCAW Parameters for Ferrite Content in 2205 DSS Welds Based on the Taguchi Design Method

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Tianqi Li ◽  
Yingying Zhang ◽  
Lei Gao ◽  
Yunhao Zhang
Keyword(s):  
Mathematical Model ◽  
Process Parameters ◽  
Welding Speed ◽  
Design Method ◽  
Welding Current ◽  
Taguchi Design ◽  
Experimental Results ◽  
Ferrite Content ◽  
Welding Parameters ◽  
Torch Angle

This study presents the Taguchi design method with L9 orthogonal array which was carried out to optimize the flux-cored arc welding (FCAW) process parameters such as welding current, welding voltage, welding speed, and torch angle with reference to vertical for the ferrite content of duplex stainless steel (DSS, UNS S32205) welds. The analysis of variance (ANOVA) was applied, and a mathematical model was developed to predict the effect of process parameters on the responses. The results indicate that welding current, welding voltage, welding speed, torch angle with reference to vertical, and the interaction of welding voltage and welding speed are the significant model terms connected with the ferrite content. The ferrite content increases with the increase of welding speed and torch angle with reference to vertical, but decreases with the increase of welding current and welding voltage. Through the developed mathematical model, the target of 50% ferrite content in weld metal can be obtained when all the welding parameters are set at the optimum values. Finally, in order to validate experimental results, confirmation tests were implemented at optimum working conditions. Under these conditions, there was good accordance between the predicted and the experimental results for the ferrite content.

Effect of delta ferrite content on the corrosion resistance of type 316 clad metals

1988 ◽  
Vol 39 (3) ◽  
pp. 135-142 ◽  
Author(s):  
K. Prasad Rao ◽  
A. Uma Maheshwar Rao ◽  
G. J. Gururaja
Keyword(s):  
Corrosion Resistance ◽  
Ferrite Content ◽  
Delta Ferrite ◽  
Clad Metals

Ferrite content measurements in S32101 lean duplex stainless steel and its welded joints

2012 ◽  
Vol 57 (3) ◽  
pp. 779-787 ◽  
Author(s):  
J. Niagaj ◽  
Ł. Mazur
Keyword(s):  
Welded Joints ◽  
Critical Factor ◽  
Industrial Applications ◽  
Ferrite Content ◽  
Welding Parameters ◽  
Special Device ◽  
Two Phase ◽  
Plastic Properties ◽  
Duplex Steel ◽  
The Impact

Due to their mechanical and plastic properties as well as unique corrosion resistance, two-phase lean duplex steels are increasingly popular in industrial applications e.g. for building waterside fixtures, ships, pipelines or containers. A critical factor of welded joints made of such steels is the balance between austenite and ferrite; the latter being measured by a special device called ferritoscope. The article contains the results of tests focused on measurements of ferrite content in S32101 lean duplex steel and its welded joints. The text also presents the impact of such factors as test sample thickness or shape and condition of measurement surface etc. on test results. In addition, this paper discusses the use of correction factors, describes problems arising during measurements of ferrite in welded joints and presents manners of the elimination of the latter. The conducted tests revealed that MAG method welding parameters affect the content of ferrite in butt welded joints produced with S32101 lean duplex steel.

scholarly journals The effect of metal transfer modes and shielding gas composition on the emission of ultrafine particles in MAG steel welding

2014 ◽  
Vol 19 (2) ◽  
pp. 168-176 ◽  
Author(s):  
J. F. Gomes ◽  
R. M. Miranda ◽  
P.A. Carvalho ◽  
M. L. Quintino
Keyword(s):  
Surface Area ◽  
Ultrafine Particles ◽  
Formation Rate ◽  
Welding Process ◽  
Gas Mixtures ◽  
Metal Transfer ◽  
Current Intensity ◽  
Welding Parameters ◽  
Gas Composition ◽  
Shielding Gas

The present study aims to characterize ultrafine particles emitted during gas metal arc welding of mild steel and stainless steel, using different shielding gas mixtures, and to evaluate the effect of metal transfer modes, controlled by both processing parameters and shielding gas composition, on the quantity and morphology of the ultrafine particles. It was found that the amount of emitted ultrafine particles (measured by particle number and alveolar deposited surface area) are clearly dependent from the main welding parameters, namely the current intensity and the heat input of the welding process. The emission of airborne ultrafine particles increases with the current intensity as fume formation rate does. When comparing the shielding gas mixtures, higher emissions were observed for more oxidizing mixtures, that is, with higher CO2content, which means that these mixtures originate higher concentrations of ultrafine particles (as measured by number of particles by cubic centimeter of air) and higher values of alveolar deposited surface area of particles, thus resulting in a more hazardous condition regarding welders exposure.

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