Application of statistical software analysis for optimization of resistance spot welding in carbon steel JIS SS400

Prachya Peasura

Abstract


This work describes an application of statistical software analysis for optimization in resistance spot welding. JIS SS400 is a carbon steel for resistance spot welding processes. The following resistance spot welding variables were examined: welding current, welding time and electrode force. The research studied and optimized the application of the full factorial design. The resulting materials were examined using the macrostructure (nugget size) according to JIS Z 3139: 1978 and tensile shear test according to JIS Z 3136: 1999 The results show that a welding current, welding time and electrode force interaction on nugget size and tensile shear test had a 95% confidence level. The resistance spot welding variables affecting the tensile shear and nugget size are the optimize welding current at 10,500 amp., welding time at 10 cycle and electrode force at 2 kN. were tensile shear of 7.18 kN. and nugget size maximum of 6.72 mm. The research described here can be used as material data on welding variable for carbon steel JIS SS400 weld in resistance spot welding. 


Keywords


Resistance spot welding; Tensile shear; Nugget size; Full factorial design; soft computing techniques

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