Please use this identifier to cite or link to this item: http://hdl.handle.net/10266/2465
Title: Parametric Approach To Optimize Submerged Arc Welding Process For Hsla Steel
Authors: Gianender
Supervisor: Batish, Ajay
Keywords: Submerged Arc Welding;HSLA;Tensile strength;Toughness;Microstructure;Taguchi Design
Issue Date: 18-Sep-2013
Abstract: The aim of the present work was to investigate the effect of various input process parameters i.e. current, travel speed, electrode diameter, flux composition, preheating of work piece, and electrode stick-out on desired response in submerged arc welding. The response measured were changes in quality of welds by radiography, impact strength, toughness at different temperature, micro hardness, weld bead height & width, chemical composition and metallurgical analysis of HSLA Steel. The effect of all the input parameters on the output response has been analyzed using the Taguchi experimental analysis. Bead geometry of the weld region was measured and bead width was mainly dependent on preheat temperature and travel speed. Bead height for HSLA steel was dependent on current and type of flux. Tensile strength of the welded specimen were studied and found that electrode diameter, welding current were the most dependent factors leading to changes in tensile strength. The tensile strength tended to increase significantly with the increase in electrode diameter from 3.2 to 4 mm and when increase in current from 450 to 500 A. Toughness at room temperature of the welded specimen were studied and found that electrode diameter, preheat temperature were the most significant factors and higher toughness at room temperature was observed when electrode diameter should be 4 mm, electrode stick-out should be 25 mm, welding current should be 450 A, preheat temperature should be 125oC, electrode stick-out 25 mm and flux should be of type 1 i.e. GEEFLUX 541 (Basic) was used. Toughness at -40oC of the welded specimens were studied and found that welding current and electrode stick-out were the most significant factors. The toughness at -40oC tended to increase significantly with the increase in current from 400 to 500 A whereas tended to decrease significantly with the decrease in electrode stick-out from 25 to 35mm. The surface morphology of the welded plates was characterized by scanning electron microscopy with energy dispersive X-ray spectroscopy analysis (EDAX). EDX showed the nickel concentration was more significant affect the toughness at room temperature of welded region. The effect of variation in input parameters has been studied on the microstructure of the welded parts. Radiography test showed that welding was of very good quality and there were negligible amount of defects i.e. porosity, lack of penetration, slag at corner with low current used. It was also observed that no significant defect found with higher current in welded region. Welding current and electrode stick-out were found to be the most dependent factors leading to changes in micro hardness. v The micro hardness tended to decrease significantly with the increase of welding current from 400 to 500 A and as electrode stick-out increase from 25 to 35 mm, micro hardness will increase. Chemical composition of welding specimen was also studied and found that percentage change in Manganese and phosphorous was increasing in weld region but other element shows the mixed rend.
Description: ME, MED
URI: http://hdl.handle.net/10266/2465
Appears in Collections:Masters Theses@MED

Files in This Item:
File Description SizeFormat 
2465.pdf14.41 MBAdobe PDFThumbnail
View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.