000			02555nam a22001817a 4500
082			_a671.52 _bS531R
100			_aSharma, Leeladhar _926259
245			_aResistance Spot Welding of Galvanized Advanced High Strength Steel DP-780 _cby Leeladhar Sharma
260			_aIIT Jodhpur _bDepartment of Mechanical Engineering _c2018
300			_axv,71p. _bHB
520			_aThis work was focused on the investigation and growth of resistance spot welding of automotive grade Advanced High Strength Steel DP-780. Experimental work was carried out on different resistance spot welded specimens. The main purpose of this work was to find out the adequate range of spot weld parameters for AHSS galvanized DP-780 steel. Selection of welding parameters should be suchthat nugget pulloutfrom the sheetcan be assuredto ascertainthe reliability of resistance spot welds. In this workone factor at a time (OFAT) approachwas followed to investigatethe influenceofwelding parameters viz. weld current, weld time, and electrode pressureon the nugget developmentand strength of the weldments. Effects of some other interdisciplinary data like, heat input, mean DCR, failure energy etc. were investigated as well. Increase inwelding current value abovea certain critical value led to the transition from interfacial failure mode to pullout failure mode resulting improved energy absorption capacity of the joint.Two stacksresistance spot welding is mostly used in automotive body structureapplications. Nevertheless, in automobile or other many applications,resistancespot welds between multiple stacksheets are requireddue to some limitations in structural designof the components. So here a small experimental analysis on three stack resistance spot welding in addition to two stack resistance spot welding was also carried out. of the resistance spot welds were investigated using for three stack resistance spot welding. Similarto two stack resistance spot weldingone factor at a time approachwas used to analyze and investigatetheinfluenceof variouswelding variablesviz. weldingcurrent, weldingtime, and electrode force on the nugget growth, nugget size and tensile shear strength
650			_aResistance Spot Welding _926260
650			_aMTech Theses _926261
650			_aDepartment of Mechanical Engineering _926262
700			_aChhibber, Rahul _926263
700			_aArora, Kanwer Singh _926264
942			_cTH
999			_c14718 _d14718