Nokta Direnç Kaynağı ile Birleştirilen DP1200 Çeliğinin Dayanımı Üzerinde Kaynak Parametrelerinin Etkisinin İstatistiksel Analizi

Bu çalışmada nokta direnç kaynaklı DP1200 çeliğinin ideal çekme makaslama dayanımını elde etmek için farklı kaynak akımı ve elektrot basıncı parametrelerinin optimizasyonuna odaklanılmıştır. Kaynak prosesleri 5 kA ve 7 kA kaynak akımlarında, 2-6 bar elektrot basınçlarında gerçekleştirilmiştir. Kaynak parametrelerinin çekme makaslama dayanımı üzerindeki etkileri çoklu doğrusal regresyon analizi ile incelenmiştir. Yapılan bu analiz ile elde edilen korelasyon tablosu ve ANOVA analiz değerleri yorumlanmıştır. Kaynak parametrelerinin önem derecesi belirlenerek, çekme makaslama dayanımı üzerindeki etkileri karşılaştırılmış ve belirlenen etki değerlerine göre çoklu doğrusal regresyon modeli oluşturulmuştur. Deneysel sonuçlar çekme makaslama dayanımını etkileyen en önemli değişkenin kaynak akımı olduğunu göstermiştir. Kaynak akımı arttıkça çekme makaslama dayanımı artmıştır. Özellikle yüksek kaynak akımı değerinde, elektrot basıncının kritik değerine kadar çekme makaslama dayanımının arttığı, fakat kritik değerinin üzerinde dayanımda düşüş olduğu görülmüştür. Sıçramanın çekme makaslama dayanımı üzerinde negatif etkiye sahip olduğu gözlenmiştir.

Anahtar Kelimeler:

DP1200 çeliği, Nokta direnç kaynağı, Regresyon analizi, Çekme makaslama dayanımı, Sıçrama

Statistical Analysis of the Effect of Welding Parameters on the Strength of DP1200 Steel Combined with Resistance Spot Welding

In this study, focused on optimization of different welding current and electrode pressure parameters to obtain the ideal tensile shear strength of resistance spot welded DP1200 steel. Welding processes were carried out at 5 kA and 7 kA welding currents and 2-6 bar electrode pressures. The effects of welding parameters on tensile shear strength were investigated by multiple linear regression analysis. The correlation table and ANOVA analysis values obtained with this analysis were interpreted. The importance of the welding parameters was determined, their effects on the tensile shear strength were compared and a multiple linear regression model was created according to the determined effect values. Experimental results showed that welding current is the most important variable affecting tensile shear strength. As the welding current increased, the tensile shear strength increased. Especially at high welding current values, it was observed that the tensile shear strength increased until the critical value of the electrode pressure, but there was a decrease in the strength above the critical value. It was observed that expulsion has a negative effect on tensile shear strength.

Keywords:

DP1200 steel, Resistance spot welding, Regression analysis, Tensile shear strength, Expulsion,

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