Optimisation of process parameters for M.A.G welding of API X70m material to predict tensile strength using Taguchi method

Girth welded replica of API X70M material have been produced on NG-GMAW welding technique. The particular area interest is to develop suitable girth process parameter using NGGMAW. major aim the work was replicate welds having tensile strength between 650 and 680 MPa. Design Experiment (DoE) method by Taguchi design, some selected processes adopted. Two parameters (factors) – arc voltage wire feed rate, (the variables), three levels were used. resultant joint property pipeline examined. targeted mechanical achieved selecting best parameters. Their effects ultimate UTS analysed statistical technique analysis variance - ANOVA Signal Noise S/N ratio with ‘thebigger-the–better’ value. Validation done MIDAS NFX (an FEA) engineering software. In conclusion, that affects or influences properties under field conditions identified. Guidance for specifications selection could be used in field-welding optimum performance has recommended.
 Keywords: Optimization, Girth-Weld, Process Parameters, Tensile Strength,