RESISTANCE SPOT WELDING CHARACTERIZATION OF PRESS HARDENED STEEL

RESISTANCE SPOT WELDING CHARACTERIZATION OF PRESS HARDENED STEEL

Abbade, L.; Lara, J. A. C.; Couto, C. P.; Gonsalez, B.; Colosio, M. A.; Rossi, J. L.

Artigo Completo:

In the automotive industry the resistance spot welding (RSW) is one of the most used processes for joining steel sheets, being of fundamental importance the quality assurance of this process. In this work, 22MnB5 steel sheets for the hot stamping process, also known as PHS (Press Hardening Steel), were joined by the technique of resistance spot welding, so that the welding parameters were changed 16 times for the evaluation of the influence of these parameters on the mechanical properties. By conducting ultrasonic, tensile and hardness test, followed by metallography, it was possible to identify the characteristics of the spot weld effect on the material. The results of the tests performed in this work confirmed the difference in mechanical strength of the thermal zone (ZTA) in relation to the molten zone (ZF). For a certain set of the parameters it was shown a decrease in the strength of the ZTA and increasing to the weld point, which is demonstrated in the microstructural analysis and thus justifies the detachment of the weld button of the base material during tensile testing, i.e., there was a higher strength in the welded area.

In the automotive industry the resistance spot welding (RSW) is one of the most used processes for joining steel sheets, being of fundamental importance the quality assurance of this process. In this work, 22MnB5 steel sheets for the hot stamping process, also known as PHS (Press Hardening Steel), were joined by the technique of resistance spot welding, so that the welding parameters were changed 16 times for the evaluation of the influence of these parameters on the mechanical properties. By conducting ultrasonic, tensile and hardness test, followed by metallography, it was possible to identify the characteristics of the spot weld effect on the material. The results of the tests performed in this work confirmed the difference in mechanical strength of the thermal zone (ZTA) in relation to the molten zone (ZF). For a certain set of the parameters it was shown a decrease in the strength of the ZTA and increasing to the weld point, which is demonstrated in the microstructural analysis and thus justifies the detachment of the weld button of the base material during tensile testing, i.e., there was a higher strength in the welded area.

Palavras-chave:

DOI: 10.5151/phypro-viii-efa-03

Referências bibliográficas

• [1] BATISTA, M. Comparative Study of the Weldability of Sheets for the Automotive Industry Using Two Resistance Welding Equipments. Master Dissertation, University of São Paulo - USP - Brazil, 2011. (In Portuguese).
• [2] MIRANDA, G. P. Resistance Point Weldability Study of 22MnB5 and DP800 Steels. Master Dissertation, Federal University of Minas Gerais, MG, Brazil, 2015. (In Portuguese).
• [3] WOLFF, M. A. Weldability of Dual-Phase 600 and 800 Steels Via Medium Frequency (mfdc) and Alternating Current (ac). Federal University of Uberlandia - UFU, MG, Brazil, 2008. (In Portuguese).
• [4] CHOI, H. S.; Park, G-H.; Lim, W-S.; Kim, B-M. Evaluation of weldability for resistance spot welded
• [5] single-lap joint between GA780DP and hot-stamped 22MnB5 steel sheets. Journal of Mechanical Science
• [6] and Technology, June 2011, 25(6):1543-1550, 2011.
• [7] GORNI, A. A. New trends for the hot stamping process. Corte & Conformação de Metais, June 2010, p. 62-77, 2010. (In Portuguese).
• [8] HEIN, P. Numerical Simulation of the Hot Stamping of Automotive Components with Usibor 1500. In:
• [9] Communicating European Research, EuroPAM, p. 17, 2005.
• [10] AWS/SAE D8.9. Recommended Practices for Test Methods for Evaluating the Resistance Spot Welding Behavior of Automotive Sheet Steel Materials. AWS, USA, 1997.

Como citar:

Abbade, L.; Lara, J. A. C.; Couto, C. P.; Gonsalez, B.; Colosio, M. A.; Rossi, J. L.; "RESISTANCE SPOT WELDING CHARACTERIZATION OF PRESS HARDENED STEEL", p-10-13. In: . São Paulo: Blucher, 2017.
ISSN 23582359, DOI 10.5151/phypro-viii-efa-03