00315nam a22001217a 4500020001500000040000900015082001500024100001800039245003900057250001600096260004200112650003900154  a8174090282  cNUST  a671.52 LIT  aParmar, R. S.  aWelding Engineering and Technology  a2nd Edition  aNew Dehli:bKhanna Publishers,c2015.  aWelding Engineering and Technology