Takım Eğim Açısının AZ31B Magnezyum Alaşımlı Levhaların Sürtünme Karıştırma Bindirme Kaynaklarının Mekanik Özelliklerine Etkisi

Öz

AZ31B magnezyum alaşımlı levhaların sürtünme karıştırma bindirme kaynağı, diğer değişkenler sabit tutularak çeşitli kaynak takım eğim açıları (0°, 1°, 2°, 3° ve 4°) altında gerçekleştirildi. Kaynakların çekme kesme yükü taşıma kapasitesi ve mikrosertliği elde edildi. Ayrıca kaynağın kırılma mekanizması da incelenmiştir. Eğim açısı kaynak kesit bölgesini ve dolayısıyla yük taşıma kapasitesini önemli ölçüde etkiledi. 0° eğim açısında tünel kusuru görüldü. 1° eğim açısında oluşturulan en güçlü bağlantının, 4° eğim açısında oluşturulan en zayıf bağlantıya göre üç kattından biraz daha fazla dayanıklı olduğu görüldü. Bağlantı mukavemeti, 1°'den sonra eğim açısının artmasıyla önemli ölçüde azaldı çünkü ilerleyen taraftaki etkin üst plaka kalınlığı, daha fazla takım omuzu nüfuzu nedeniyle oldukça azaldı. Eğim açısı artırıldığında, muhtemelen daha fazla ısı girdisi nedeniyle ısıdan etkilenen ve kaynak bölgelerindeki sertlik azalmıştır. Çekme testi sırasında kaynak bölgelerinde herhangi bir kırılmanın meydana gelmemesi birleştirmenin sağlam olduğunun kanıtıdır.

Anahtar Kelimeler

• Sürtünme karıştırma bindirme kaynağı
• AZ31B magnezyum alaşımı
• takım eğim açısı
• mikrosertlik
• çekme kesme mukavemeti

Effect of Tool Tilt Angle on The Mechanical Properties of Friction Stir lap Welds of AZ31B Magnesium Alloy Sheets

Abstract

Friction stir lap welding of AZ31B magnesium alloy sheets was conducted under various welding tool tilt angles (0°, 1°, 2°, 3° and 4°) keeping other variables constant. Tensile shear load carrying capacity and microhardness of the welds were obtained. Furthermore, the fracture mechanism of the weld was examined. The tilt angle significantly affected the weld cross-section zone and thus its load carrying capacity. At 0° tilt angle tunnel defect was seen. It was seen that the strongest joint created at 1° tilt angle was slightly more than three times stronger than the weakest one made at 4°. The joint strength considerably decreased with increasing tilt angle after 1° because the effective top sheet thickness on the advancing side was highly reduced because of more tool shoulder penetration. Hardness in heat-affected and weld zones decreased when the tilt angle was improved probably due to the more heat input. The fact that no breakage occurred from the weld areas during the tensile test is evidence of strong joining.

Keywords

• Friction stir lap welding
• AZ31B magnesium alloy
• tool tilt angle
• microhardness
• tensile shear load

Kaynakça

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