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lupine publishers|                Prediction of Brinell Hardness Number; A TIG Process Parameter Needed to Eliminate Post Weld Crack Formation and Stabilize Heat Input in Mild Steel Weldment Using Fuzzy Logic (FL)Research Article

The Brinell hardness number (BHN) is the load divided by the surface area of indentation. The diameter of the impression is measured with a microscope with a superimposed scale. BHN remains vital parameters for the assessment of weld quality and also to eliminate post weld crack formation. The focus of this study is to predict tig process parameter such as Brinell hardness number (BHN)  for  eliminating  post  weld  crack  formation,  and  stabilizing  heat  input  in  mild  steel  weldment.  The  key  input  parameters  considered  in  this  work  are  welding  current,  welding  voltage  and  welding  speed  while  the  response  or  measured  parameter  is  Brinell  hardness  number  (BHN).  Using  the  range  and  levels  of  the  independent  variables,  statistical  design  of  experiment  (DOE)  using central composite design (CCD) method was done. Hundred (100) pieces of mild steel coupons measuring 60 x 40 x10 were used  for  the  experiments.  The  experiment  was  performed  20  times,  using  5  specimens  for  each  run.  The  plate  samples  were  60  mm long with a wall thickness of 10mm. The samples were cut longitudinally with a Single-V joint preparation. The tungsten inert gas welding equipment was used to weld the plates after the edges have been bevelled and machined. The welding process uses a  shielding  gas  to  protect  the  weld  specimen  from  atmospheric  interaction.  For  this  study,  100%  pure  Argon  gas  was  used.  The  weld samples were made from 10mm thickness of mild steel plate; the plate was cut to size with the power hacksaw. The edges grinded and surfaces polished with emery paper and the joints welded and thereafter, the response (Brinell hardness number) was measured, recorded, and analysed using fuzzy logic.

153Copyright © All rights are reserved by Obahiagbon K.Journal of Mining and Mechanical EngineeringResearch ArticlePrediction of Brinell Hardness Number; A TIG Process Parameter Needed to Eliminate Post Weld Crack Formation and Stabilize Heat Input in Mild Steel Weldment Using Fuzzy Logic (FL)Pondi P1, Achebo J2 and Obahiagbon K3*1Department of Production Engineering, University of Benin, Nigeria2Department of Production Engineering, University of Benin, Nigeria3Department of Chemical Engineering, University of Benin, Nigeria*Corresponding author:Obahiagbon K, Department of Chemical Engineering, Faculty of Engineering, University of Benin, P.M.B 1154, Benin City, Edo State, NigeriaReceived:March 26, 2021 Published:April 22, 2021Introduction Most  of  the  structural  failures  happening  today  is  because  of  poor  weld  strength  Palani  et.al.  [1]  These  welding  failures  are  mostly influenced by improper combination of the welding process factors  Marseguerra  et  al.  [2]  The  quality  and  strength  of  a  weld  is  characterized  by  the  reduction  and  elimination  of  weld  defects  such  as  cracks,  undercut,  deformation,  porosity  [3]  in  addition  to  controlling the heat input which is a very strong determining factor needed  to  produce  a  reliable  weld  Shubhavardhan  et.  al.  [4]  One  of  the  fundamental  issues  facing  Engineers  in  the  manufacturing  sector  is  the  problem  of  choosing  the  most  suitable  combinations  of input process parameters to achieve the required optimum weld bead  quality  Springer  et.al.  [5]  It  is  a  well-known  fact  that  most  welders  mainly  focused  on  [6]  bead  geometry  and  aesthetics  of  the  weld  structure,  but  the  reduction  in  post  weld  cracks  which  determines  the  overall  quality  of  weldment  has  not  been  paid  much attention Navid et.al.[7] These problems can be solved with

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