A Study on the Selection of Fillet Weld Conditions by Considering the Tack Welds

Lee, Jun-Young; Kim, Jae-Woong; Kim, Cheol-Hee

Journal of KWJS 2006;24(5):29-36.
Published online January 4, 2007.

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A Study on the Selection of Fillet Weld Conditions by Considering the Tack Welds

Jun-Young Lee, Jae-Woong Kim, Cheol-Hee Kim

Abstract

In this study, an experimental method for the selection of optimal welding condition was proposed in the fillet weld which was done over the tack weld. This method used the response surface analysis in which the leg length and the reinforcement height were chosen as the quality variables of the weld bead profile. The overall desirability function, which was combined desirability function for the two quality variables, was employed as the objective function for getting the optimal welding condition.
In the experiments, the target values of the leg length and the reinforcement height are 6mm and zero respectively for the horizontal fillet weld of 10mm thickness mild steel. The optimal welding conditions could predict the weld bead profile(leg length and reinforcement height) as 6.00mm and 0.19mm without tack weld and 6.00mm and 0.48mm with tack weld. From a series of welding test, it was revealed that a uniform weld bead can be obtained by adopting the optimal welding condition which was determined according to the method proposed.

Key Words: Fillet welding, Response surface methodology, Central composite design (CCD), Desirability function, Leg length, Reinforcement height, Tack welding