Deltaspot as an innovative method of resistance spot welding

Resistance spot welding has established itself across a wide range of industries as a cost-effective method for joining steel sheets. In modern vehicle manufacturing in particular, steel sheets of varying strengths, quality and surface treatment need to be joined. One of the problems of resistance spot welding in the automotive industry is the lifetime of welding electrode tips. The new innovative method of resistance spot welding DeltaSpot should solve this problem by using the special process tape between welding electrodes and joining materials. The paper describes the principle of DeltaSpot welding method and evaluates the properties of DeltaSpot joints made by combination of galvanized steel sheets DX51D+Z (a₀ = 0.9 mm) and RA-K 40/70+Z100MBO (a₀ = 0.77 mm). The basic mechanical properties of welded joints were evaluated. Some samples were prepared for metallographic analysis where the influence of the welding parameters on the structure of welded joint was observed. The properties of DeltaSpot joint were compared to the properties of standard resistance spot joints.

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1. Zhang H., Senkara J.: Resistance welding: Fundamentals and applications, Taylor & Francis Group, New York 2006.
2. Florea R.S. et.al.: Resistance spot welding of 6061-T6 aluminum: Failures loads and deformation, Mater.  Design, 34 (2012), 624-630.
3. Williams N.T., Parker J.D.: Review of resistance spot welding of steels sheets. Part. 1: Factors influencing electrode life, Int. Materials Reviews, 49 (2004), 45-75.
4. Williams N.T., Parker J.D.: Review of resistance spot welding of steels sheets. Part. 2: Modelling and control of weld nugget formation, Int. Materials Reviews, 49 (2004), 77-108.
5. Ling S-F., Wan L-X., Wongn Y-R., Li D-N.: Input electrical impedance as quality monitoring signature for characterizing resistance spot welding, NDT&E International, 43 (2010), 200-205.
6. Viňáš J., Kaščák Ľ., Ábel M.: Influence of welding parameters on the quality of spot welds of high-strength steels, Int. Conf. Innovative Technologies, Prague 2010, 405-408.
7. Kaščák Ľ., Viňáš J.: Influence of welding parameters of resistance spot welding on the quality of welded joints, Zeszyty Naukowe Politechniki Rzeszowskiej, 273, Mechanika, 80(2010), 127-134.
8. Kaščák Ľ., Brezinová J., Halama M., Viňáš J.: Quality evaluation of resistance spot welds of hot-dip galvanized sheets in corrosive environment, Chemické Listy, 105 (2011), 709-712.
9. DeltaSpot – A new spot welding process for the automotive industry, Fronius Company.
10. Vaško A., Belan J.: Applications of methods of quantitative metallography in materials engineering, Int. J. Appl. Mech. Engn., 15 (2010), 405-410.
11. Spišák E., Kaščák Ľ., Viňáš J.: Research into properties of joints of combined materials made by resistance spot welding, Chemické Listy, 105 (2011), 488-490.
12. Kaščák Ľ., Viňáš J.: Evaluation of properties of spot welds made by combination of high strength and deep-drawing steels, Acta Mechanica Slovaca, 12 (2008), 187-192.
13. Viňáš J., Ábel, M., Kaščák Ľ.: Deformation influence on a lifetime of welding electrode tips, Mater. Engn., 16 (2009), 19-23.