INVESTIGATION OF THE EFFECTS OF PIN OVERLAP PHENOMENON ON THE MECHANICAL PROPERTIES OF FRICTION STIR WELDED AA7075/AA6013 ALLOY COUPLE

Öz

   In this study, the friction stir welding ability of AA7075 / AA6013 aluminum alloy couple was investigated. The interaction between the pin profiles and overlapped welding seams affecting the mechanical properties was investigated. The welded joints were characterized by tensile and bending tests.  The highest tensile strength of 203 MPa and the lowest elongation at rupture with a value of 2.12% were obtained in the absence of offset using a tool with conical pin geometry. Root bending strength and surface bending strength values were found to be 288 MPa and 284 MPa, respectively. The highest root bending strength was measured to be 293 MPa; it was obtained from the welded joint manufactured via offsetting the tool with the pentagonal pin profile on the AS direction. This welded joint was found to contain defects. All welded joints joined by tools with pentagonal pin profiles have been found to exhibit crack-type imperfections affecting the tensile test results.

Anahtar Kelimeler

• Pin overlap,Pin profile,Mechanical properties,Friction stir welding

AA7075/AA6013 ALAŞIM ÇİFTİNİN SÜRTÜNME KARIŞTIRMA KAYNAĞI İLE BİRLEŞTİRİLMESİNDE PİM ÇAKIŞMASININ MEKANİK ÖZELLİKLER ÜZERİNE ETKİLERİNİN İNCELENMESİ

Öz

   Bu çalışmada, AA7075/AA6013 alüminyum alaşım çiftinin sürtünme karıştırma kaynak yöntemiyle kaynaklanabilme kabiliyeti incelenmiştir. Üst üste bindirilmiş kaynak dikişlerinin ve pim profillerinin etkileşiminin mekanik özellikler üzerindeki etkisi araştırılmıştır. Çekme ve eğme testleri ile kaynaklı bağlantılar karakterize edilmiştir. En yüksek çekme dayanımı olan 203 MPa ve en düşük kopma uzaması değeri %2,12 konik pim geometrisine sahip takımın kullanılması ve herhangi bir ofsetin söz konusu olmadığı durumda elde edilmiştir. Kök eğme mukavemeti ile yüzey eğme mukavemeti değerleri ise sırasıyla 288 MPa ve 284 MPa olarak bulunmuştur. Eğme testi sonrasında ölçülen en yüksek kök eğme mukavemeti değeri 293 MPa’dır ve beşgen pim profiline sahip takımın AS yönünde ofsetlenmesiyle imal edilen kaynaklı bağlantıdan elde edilmiştir. Bu kaynaklı bağlantı aynı zamanda kusurlar da içermektedir. Beşgen pim profiline sahip takımlarla yapılan kaynaklı bağlantıların hepsinde çatlak tipi kusurlar tespit edilmiştir ki bu durum çekme testi sonuçlarına da yansımıştır.  

Anahtar Kelimeler

• Pim çakışması,Pim profili,Mekanik özellikler,Sürtünme karıştırma kaynağı

Kaynakça

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