This study investigated the multi-response optimization of tungsten inert gas welding (TIG) welding process for an optimal
parametric combination to yield favorable bead geometry of welded joints using the Grey relational analysis and Taguchi
method. Sixteen experimental runs based on an orthogonal array of Taguchi method were performed to derive objective
functions to be optimized within experimental domain. The objective functions have been selected in relation to parameters of
TIG welding bead geometry; bead width, bead height, penetration, area of penetration as well as width of heat affected zone and
tensile load. The Taguchi approach followed by Grey relational analysis to solve the multi-response optimization problem. The
significance of the factors on overall quality characteristics of the weldment has also been evaluated quantitatively by the
analysis of variance method (ANOVA). Optimal results have been verified through additional experiments. This shows
application feasibility of the Grey relation analysis in combination with Taguchi technique for continuous improvement in
product quality in manufacturing industry.

Predstavljeni so rezultati optimizacije odgovorov pri varjenju v inertni atmosferi z volframovo elektrodo (TIG) za dosego
optimalne geometrije varka z uporabo analize po Greyju in Taguchijevi metodi. [estnajst eksperimentalnih varkov je bilo
nanesenih v ortogonalni razporeditvi po Taguchijevi metodi, da bi dolo~ili parametre, ki jih je treba eksprimentalno optimirati.
Ti parametri, izbrani v povezavi s parametri TIG-varjenja, so: geometrija varka, {irina varka, vi{ina varka, penetracija, povr{ina
penetracije, {irina toplotne zone in natezna obremenitev. Taguchijevemu pribli`ku je sledila Greyjeva racionalna analiza zaradi
optimizacije ve~ odgovorov pri problemu optimizacije. Pomen dejavnikov za karakteristike splo{ne kakovosti zvarov je
kvantitativno ocenjen z analizo po meodi variance (ANOVA). Optimalne rezultate smo verificirali z dodatnimi poskusi. To ka`e
na mo`nost uporabe Greyjeve analize v kombinaciji s Taguchijevo tehniko za stalno rast kakovosti v predelovalni industriji.