A simple method to evaluate the strength of corona bond of resistance spot welding is proposed and verified by removing the nugget of welded specimen before conducting a cross tension test. The strength of the corona bond is evaluated using thin steel sheets of different strengths. The result indicates that the higher the strength of the steel sheet, the higher the strength of the corona bond. A tensile test of the corona bond part is conducted using the small tensile test technique to verify the corona bond strength. A comparison of the stress value at the same strain (1%) indicates that the stress of the small tensile test is in the order of the strength of the steel sheet.
WakabayashiC, MiyazakiY, FurusakoS, Reliability improvement techniques for spot weld of high tensile strength steel sheets for automobiles. Nippon Steel Sumitomo Metal Tech Report. 2019; 119:52–58.
2.
PouranvariM, AsgariHR, MosavizadchSM, Effect of weld nugget size on overload failure mode of resistance spot welds. Sci. Technol Weld Join. 2007; 12(3):217–225. doi: 10.1179/174329307X164409
3.
BayN.Cold pressure welding-the mechanisms governing bonding. Trans ASME J Eng Ind. 1979; 101(2):121–127. doi: 10.1115/1.3439484
4.
NakayamaE.Evaluation of local material strength property by small specimen - Application to strength prediction of spot-welded joint. Weld Int. 2007; 21(4):255–260. doi: 10.1080/09507110701411841
5.
MatsuiS, WakabayashiC, KodamaS.Effect of gap between steel sheet and electrode on resistance spot welding. Mater Sci Forum. 2018; 941:158–163. doi: 10.4028/www.scientific.net/MSF.941.158
6.
NakayamaE, FukumotoM, MiyaharaM, Evaluation of local fatigue strength in spot weld by small specimen. FFEMS. 2010; 33(5):267–275.
7.
SadasueT, IgiS, TaniguchiK, Fracture behaviour and numerical study of resistance spot welded joints in high strength steel sheet. Weld Int. 2016; 30(8):602–613. doi: 10.1080/09507116.2016.1142187
8.
BanerjeeP, SarkarR, PalTK, Effect of nugget size and notch geometry on the high cycle fatigue performance of resistance spot welded DP590 steel sheets. J Mater Process Technol. 2016; 238:226–243. doi: 10.1016/j.jmatprotec.2016.07.023
9.
OikawaH, MurayamaG, SakiyamaT, Resistance spot weldability of high strength steel (HSS) sheets for automobiles. Nippon Steel Technical Report. 2007; 95:39–45.
