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

Year 2019, Volume: 8 Issue: 1, 436 - 446, 28.01.2019

Şefika Kasman Sertan Ozan

https://doi.org/10.28948/ngumuh.517159

Abstract

   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.

Keywords

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

Abstract

   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.  

Keywords

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

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