Rukiye ERTAN, Sedat ARAS, Hande GÜLER ÖZGÜL

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

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

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

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.

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