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Pal, Pradip Kumar
- Submerged Arc Welding With a Mixture of Fresh Flux and Fused Slag-Modeling with Quadratic Response Surface Methodology
Authors
1 Department of Mechanical Engineering, B. P. Poddar Institute of Management & Technology, 137, VIP Road, Poddar Vihar, Kolkata - 700052, IN
2 Department of Mechanical Engineering, Jadavpur University, Kolkata-700032, IN
Source
Indian Welding Journal, Vol 39, No 4 (2006), Pagination: 20-31Abstract
In the present research work the reconsumption of the slag, generated during conventional submerged arc welding, has been proposed during subsequent runs by incorporating appropriate treatment and mixing it with fresh flux, with certain proportions. Experiments have been carried out by using four different levels of process parameters like welding current, flux basisity index and slag-mix percentage (percentage of slag in the mixture of fresh flux and fused slag) to obtain bead-on-plate weldment on mild steel plates. Parameters associated with bead geometry like bead height, bead width, depth of penetration have been measured for each experimental run. Heat affected zone (HAZ) geometry in terms of HAZ width has also been obtained. Assuming simple geometry of the weld bead and unit length of the job, approximate bead volume has also been calculated. All these data have been efficiently utilized to develop mathematical models for prediction of geometry and quality of weld bead as well as heat affected zone. Quadratic response surface methodology (RSM) has been applied to develop the mathematical models between predictors and responses. Based on multiple linear regressions, the coefficients of the predictors, used in the models, have been determined. Analysis of Variance Method (ANOVA), F- test and Student's t test have checked the significance of the coefficients. Reduced models with significant coefficients have also been developed. Experimental data as well as generated data have been used to represent graphically the direct and interactive effects of process parameters (slag mix% has given special emphasis in this exercise) on selected response variables associated with weld bead and HAZ. Hardness Test has also been carried out to reflect graphically, the influence of using slag-mix in SAW process on mechanical property of the weldment i.e. hardness of weld metal as well as HAZ. Finally it has been concluded that effect of using slag-mix (up to 20%) do not impose any alarming adverse effect on features of bead geometry and HAZ. Therefore, the use of slag-mix, in submerged arc welding can be recommended to apply it in practical cases, which may make the process more economical.
Keywords
SAW, Slag-Mix, HAZ, RSM, ANOVA.
- Experimental Investigation of TIG Welding on Duplex Stainless Steel
Authors
1 Department of Mechanical Engineering, Haldia Institute of Technology, Haldia- 721657, IN
2 Department of Mechanical Engineering, Jadavpur University, Kolkata- 700032, IN
Source
Indian Welding Journal, Vol 53, No 4 (2020), Pagination: 58-64Abstract
Duplex stainless steel has the inimitable arrangement of two phase microstructure of 50% δ-ferrite and 50% austenite. TIG welding on DSS is more easy, comfortable and useful, if the process is precisely understood and controlled through development of the science & technology of the process in the context of DSS welding by extensive research. In present work, influence of welding current, speed of TIG welding and gas flow rate on quality of DSS weld has been examined through valuable experiments. After experiment its analysis has been done. A design of experimentations has been used which is constructed upon the Taguchi technique. Experimental data has been analyzed by Principal Component Method. Investigation of present-day experiments is scheduled to have various perceptions of Butt joints of TIG welding between UNS2205 duplex stainless steel (DSS) plates. The sole aim of the current investigation is to use the Taguchi analysis, in order to create the optimum combination of controllable factors for Tungsten Inert Gas (TIG) Welding on 2205 DSS. The Taguchi analysis is used to define the optimum design set indices like welding current, shielding gas flow rate and speed of the welding. The experimental readings have been studied; inferred and evaluated with the help of ultimate tensile strength, yield strength, percentage of elongation integrated with the help of Principal Component Analysis (PCA) technique. Butt welding joints of 2205 duplex stainless steel plates have been made. Recently, DSS weld has made sufficient responsiveness in many avenues, such as in oil and gas industries, water purification plants etc. The Principal Component Analysis technique is used to find the optimum set.Keywords
Optimization, Butt Joint, Duplex Stainless Steel, TIG Welding, Tensile Test, Principal Component Analysis (PCA).References
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