Inverter DC resistance spot weldability of 590 MPa galvannealed steel for automotive applications

• Autorzy: Yoon H. , Kim D. , Kang M.
• Języki publikacji: EN

Abstrakty

EN

Purpose: This study analyzes resistance spot weldability of coated and uncoated DP 590 steels. Design/methodology/approach: To compare the resistance spot weldability of coated (GAFC590, galvannealed) and uncoated (SPFC590) steels, tensile strength test and macro-section test were conducted for the resistance spot welds. Acceptable welding conditions were determined as a function of the resistance spot welding process parameters such as electrode force, welding time, and welding current. The lower limit of the welding lobe was the minimum shear tension strength for 590 MPa-grade steel while the upper limit was determined whether or not expulsion was detected. Findings: Galvannealed steel required more welding current than uncoated steel. Acceptable welding current condition and welding lobe were changed depending on whether steel is coated or not. Research limitations/implications: This study is forced on inverter DC resistance spot weldability of 590Mpa-grade steels for automotive application. Practical implications: This study confirms the weldability of galvannealed steel by comparing resistance spot weldability depending on whether or not the steels is coated. Originality/value: This study analysed resistance spot weldability depending on whether or not steel sheets are coated, where SPFC590 uncoated steel) and GAFC590 (galvannealed steel) were used. The required spot welding current for galvannealed steels was higher than the uncoated steel and welding lobes for coated and uncoated steels were determined.

Słowa kluczowe

EN

galvannealed steel; galvanization; inverter

PL

stal galwanizowana; galwanizacja; przemysł motoryzacyjny; przemiennik

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2011
• Tom: Vol. 49, nr 2
• Strony: 112--117
• Opis fizyczny: Bibliogr. 7 poz.

Twórcy

autor

Yoon H.

autor

Kim D.

autor

Kang M.

• Department of Mechanical Engineering, Hanyang University, 17 Haengdang-Dong, Seoul, Korea,

Bibliografia

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• [2] D.C. Kim, H.J. Park, I.S. Hwang, M.J. Kang, Resistance spot welding of aluminium alloy sheet 5J32 using SCR type and inverter type power supplies, Achievements in Material and Manufacturing Engineering 38/1 (2009) 55-60.
• [3] K.C. Kim, M.Y. Lee, T.J. Lim, Effect of process parameters of heat input efficiency in condenser discharge welding, Journal of KWS 5/1 (1996) 3-5.
• [4] H.S. Jang, S.B. Joe, Realtime measurement of power and dynamic resistance in resistance spot welding, Journal of KWS (2003) 143-145.
• [5] G. Mrówka-Nowotnik, J. Sieniawski, M. Wierzbińska, Intermetallic phase particles in 6082 aluminium, Achieves of Materials Science and Engineering 28/2 (2007) 69-76.
• [6] B.M. Brown, A comparison of AC and DC resistance welding of automotive steels, Welding Journal (1987) 18-23.
• [7] G.L. Leone, B. Altshuller, Improvement on the resistance spot weldability of aluminum body sheet, SAE 840292 (1984).