Comparison between AC and MF-DC resistance spot welding by using high speed filming

• Autorzy: Alfaro S. C. A. , Vargas J. E. , Wolff M. A. , Vilarinho L. O.
• Języki publikacji: EN

Abstrakty

EN

Purpose: In this work it will be carried through the filming of the formation and growth of the nugget in resistance spot welding executed in AC and MF. A comparison for same times in both the processes will be carried through to verify which of the used processes offers better conditions, control and results as well as will help for one better understanding of the process aiming at the optimization. Design/methodology/approach: Two different spot welding machine (AC and MF-DC) had been used, and a digital high-speed camera. The weld points had been carried through in 3 galvanized steel different plate configurations. The electrodes had been truncated to obtain one better visualization for the weld nugget formation. The comparison of the formation and development between the weld point of each process (AC and MF) is shown in 7 pictures in the same values of time. Findings: For currents below 2 kA, no nugget was observed, and the formation of same after 10 degrees cycle for bigger current of 3 kA. The MF-DC welding offers the possibility of obtaining nuggets more uniforms within shorter times (depending on the plate configuration). Research limitations/implications: In this work the AC machine is limited by the values of current of welding and pressure of the electrodes: (2 - 6) kA e (87 - 261) kgf respectively. Other materials: aluminum, stainless steel or material exactly dissimilar could be used following the line of this research. Bigger currents levels can also be used. Originality/value: The idea to compare resulted for the same process of welding under different conditions (equipment, materials and or parameters) makes possible the choice of these better conditions used to the optimization of the process.

Słowa kluczowe

EN

welding; resistance spot welding; nugget formation; high-speed filming

PL

zgrzewanie; zgrzewanie oporowe punktowe; tworzenie jądra zgorzeliny; filmowanie szybką kamerą

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 24, nr 1
• Strony: 333--339
• Opis fizyczny: Bibliogr. 4 poz., fot., rys., tab.

Twórcy

autor

Alfaro S. C. A.

autor

Vargas J. E.

autor

Wolff M. A.

autor

Vilarinho L. O.

• Graco, University of Brasilia, Brasilia, Brazil,

Bibliografia

• [1] D.W. Dickinson, J.E. Franklin A. Stanya, Characterization of spot welding behavior by dynamic electrical resistance monitoring, Welding Journal 59 (1980) 170-176.
• [2] J.G. Kayser, G.J. Dunn, T.W. Eagar, 1982, The effect of electrical resistance on nugget formation during spot welding, Welding Journal 61 (1982) 167-174.
• [3] Y. Cho, S. Rhee, 2003, Experimental Study of Nugget Formation in Resistance Spot Welding, Welding Journal 8 (2003) 195-201.
• [4] H.S. Cho, Y.J. Cho, A study of the thermal behavior in resistance spot welding, Welding Journal 68 (1989) 236-244.