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One of the greatest difficulties traditionally found in stainless steel   constructions has been the execution of welding parts in them. At the   present time, the available technology allows us to use arc welding   processes for that application without any disadvantage. Response surface   methodology is used to optimise a process in which the variables that take   part in it are not related to each other by a mathematical law. Therefore,   an empiric model must be formulated. With this methodology the optimisation   of one selected variable may be done. In this work, the cooling time that   takes place from 800 to 500ºC, t8/5, after TIG welding operation, is   modelled by the response surface method. The arc power, the welding velocity   and the thermal efficiency factor are considered as the variables that have   influence on the t8/5 value. Different cooling times,t8/5, for different   combinations of values for the variables are previously determined by a   numerical method. The input values for the variables have been   experimentally established. The results indicate that response surface   methodology may be considered as a valid technique for these purposes

Calculation of t8/5 by response surface methodology for electric arc welding applications