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조대희(Dae-Hee Jo),이장규(Zhang-Kyu Rhee),박성완(Sung-Oan Park),조진호(Jin-Ho Cho),김봉각(Bong-Gag Kim),우창기(Chang-Ki Woo) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.4
In this paper, for the purpose of investigation the acoustic emission(AE) behaviors during resistance spot welding process and tension test of SPCC steels. As the results present the resistance spot welding method that can get suitable welding qualities or structural integrity estimating method. The resistance spot welding process consists of several stages: set-down of the electrodes; squeeze; current flow; forging; hold time; and lift-off. Various types of AE signals are produced during each of these stages. For tensile-shear test and cross tensile test in resistance spot welded specimens, fracture patterns are produced: tear fracture; shear fracture; and plug fracture. Tensile-shear specimens strength appeared higher than cross tensile specimens one. In case of tensile-shear specimen happened tear fracture that crack happens in most lower plate. Also, in case of cross tensile specimens, upper plate and lower plate are detached perfect fracture was exposed increases a little as acting force is lower than ordinary welding condition. Therefore, the structure which is combined by resistance spot welding confirmed that welding design must attain so that shear stress may can interact mainly.