conotoxin In the present work laser welding parameters

In the present work, laser welding parameters were optimised using Taguchi analysis with GRA for welding of P92 material using conotoxin cooled slab CO2 laser. The welding trials were carried out using Taguchi L9 orthogonal array in bead on plate (BOP) mode by varying laser power, welding speed and focal position. The trials were carried out twice in a random manner to avoid sequential error. The welds were cut in the transverse direction to study the macrostructure and bead geometry characteristics like depth of penetration, top weld width and HAZ width, which were taken as responses. The average of the responses was taken for the analysis. Subsequently, ANOVA was performed and the optimum parameters were derived. The optimum parameters obtained through the analysis were verified experimentally and the results were presented and discussed.
Experimental procedure
Results and discussion Macrostructures of the weld for all the parameters experimented are given in Fig. 1 and the bead geometry responses are given in Table 3.
Conclusions From the study and analyses, the following conclusions could be made:
Acknowledgment We sincerely thank the management of Bharat Heavy Electricals Ltd., for funding hypertonic research programme. We extend our gratitude to Mr. R. Easwaran, General Manager, WRI & Labs, for guiding us throughout the research work.