MICROSTRUCTURE AND MECHANICAL PROPERTIES OF DISSIMILAR RESISTANCE SPOT WELDED ZN-COATED DP800-TBF1180 AUTOMOTIVE STEELS USING MFDC TECHNOLOGY
Küçük Resim Yok
Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Polska Akad Nauk, Polish Acad Sciences, Inst Metall & Mater Sci Pas
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The use of advanced high-strength steel in the automotive industry is increasing in last decade. This is due to the restrictions to reduce fuel consumption and thereby decrease harmful carbon dioxide emissions. This paper aims to investigate welding properties of dissimilar resistance spot welded hot dip galvanized DP800-TBF1180 automotive steels using MFDC (Mid Frequency Direct Current) technology. LME crack occurrence due to the zinc coating was determined by magnetic particle test. The mechanical properties of welded joints were determined by tensile-shear, cross-tension and hardness measurements. The micro structural characterization was also performed in the weld zones of the joints. The appropriate welding parameter range were selected for welding processes by MFDC technology. Therefore, LME crack formation were not observed according to magnetic particle test. The highest strength was obtained as 17.60 kN and 5.51 kN by tensile-shear and cross tension tests, respectively with a welding current of 8 kA. In addition, a soft zone was found in the HAZ for both base metals. The hardness decrease in HAZ is more pronounced on the TBF1180 side. The soft zone hardness values of the sample S4 were approximately 330 HV, and the hardness values of the base material were measured in the range of 376-386 HV.
Açıklama
Anahtar Kelimeler
DP800 steel, TBF 1180 steel, MFDC, resistance spot welding, welding current, liquid metal embrittlement
Kaynak
Archives of Metallurgy and Materials
WoS Q Değeri
N/A
Scopus Q Değeri
Q4
Cilt
69
Sayı
2
