The Effect of the Welding Current on the Mechanical Properties of the New Generation Steels Welded with Resistance Spot Welding

Yıl 2019, Cilt: 19 Sayı: 2, 461 - 469, 17.09.2019

Rukiye Ertan Sedat Aras Hande Güler Özgül

Öz

In this study, three
different high strength steel sheet materials of different thicknesses DP 800,
Usibor 1500 and Ductibor 500P were joined with resistance spot welding using
different welding currents. The mechanical properties of the joints were
evaluated by hardness and tensile-shear tests. Tensile test specimens were
prepared by applying an electrical resistance spot weld to the samples in lap
state for pairs of co-material. According to the hardness and tensile test
results, DP 800 and Ductibor 500P materials were highly affected from the
welding current, but in Usibor 1500 no significant change was observed. The
maximum tensile force was decreased in DP 800 and increased in Ductibor 500P
joints with welding current increasing. In addition, Ductibor 500P material has
been found to have the highest strength and hardness values after welding.

Anahtar Kelimeler

DP 800, Usibor 1500, Ductibor 500P, Resistance spot welding, Tensile-shear test, Vickers hardness test

Direnç Nokta Kaynağı ile Birleştirilen Yeni Nesil Çeliklerde Kaynak Akımının Mekanik Özelliklere Etkisi

Öz

Bu çalışmada farklı
kalınlıklardaki DP 800, Usibor 1500 ve Ductibor 500P olmak üzere üç farklı
yüksek dayanımlı çelik sac malzeme farklı kaynak akımları kullanılarak direnç nokta
kaynağı ile birleştirilmiştir. Bağlantıların mekanik özellikleri sertlik ve
çekme testleri ile değerlendirilmiştir. Aynı malzeme çiftleri için bindirme
şeklindeki numunelere elektrik direnç nokta kaynağı uygulanarak çekme
numuneleri hazırlanmıştır. Elde edilen sertlik ve çekme testi sonuçlarına göre
kaynak akımı değişiminden DP 800 ve Ductibor 500P malzemeleri yüksek oranda
etkilenirken, Usibor 1500’de önemli bir değişim görülmemiştir. Kaynak akımı
artışıyla birlikte maksimum çekme kuvveti DP 800 birleştirilmelerinde düşerken
Ductibor 500P’de ise artış sergilemiştir. Bunun yanında Ductibor 500P
malzemenin kaynak sonrasında en yüksek dayanım ve sertlik değerlerine sahip
olduğu görülmüştür.

Anahtar Kelimeler

DP 800; Usibor 1500; Ductibor 500P; Direnç nokta kaynağı; Çekme-makaslama testi; Vickers sertlik testi

Kaynakça

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