Abstract:In the present study, Ti6Al4V titanium alloy plates were joined using a robotic fiber laser welding method. The laser welding process was carried out at two different welding speeds. Effects of different heat input conditions on the microstructure and mechanical properties of robotic fiber laser welded joints were investigated. Some grain coarsening was observed in the microstructure of weld metal in samples joined using high heat input, compared to those using low heat input, and volume rates of primary α structures increased in the weld metal. The microstructure of weld metal in samples joined using low heat input was made of basket-weave or acicular α' grains and primary β grains in grain boundaries. Tensile and yield strength of samples joined using low heat input were higher than for those joined using high heat input, but their ductility was lower.
Bu çalışmada, Ti6Al4V titanyum alaşımı levhalar Nd:YAG lazer kaynak yöntemiyle birleştirilmiştir. Lazer kaynaklı birleştirmelere kaynak öncesi ve sonrası ısıl işlem uygulanmıştır. Ön ısıtma uygulanan lazer kaynaklı numunelere, kaynak sonrası gerilim giderme, solüsyon ısıl işlemi ve yaşlandırma ısıl işlemi uygulanmıştır. Isıl işlem şartlarının, lazer kaynaklı birleştirmelerin mikroyapı ve mekanik özelliklerine etkileri incelenmiştir. Deney sonuçları incelendiğinde, yaşlandırma ısıl işlemi uygulanan numunelerin mikroyapısı yaşlandırma uygulanmayan numunelere göre daha kaba taneli bir yapıdan oluşum gösterdiği gözlenmiştir. Yaşlandırma uygulanan numunelerde süneklik ve tokluk değerlerinde artış gözlenirken yaşlandırma uygulanmayan numunelerin sertlik ve çekme dayanımlarında artış tespit edilmiştir.
In the present study, Ti6Al4V titanium alloy plates were joined using robotic laser welding method. Pre-and post-weld heat treatments were applied to laser welded joints. After welding stress relieving, solution heat treatment and ageing were also applied to preheated laser welded samples. Effects of heat treatment conditions on microstructural characteristics and mechanical properties of robotic laser welded joints were studied. Aged samples were found to be made of coarsened grains compared to microstructures of non-aged samples. There were increases in ductility and impact toughness of samples applied to ageing increased, while hardness and tensile strength of non-aged samples were higher. The highest value for tensile strength and for impact toughness in welded samples have been identified as 840 MPa and 27 J, respectively. Fractures in tensile test samples and base metal impact test samples took place in the form of ductile fracture, while laser welded impact test samples had fractures in the mode of intergranular fractures with either a quasi-cleavage type or tear ridges. EDS analysis carried out for all heat treatment conditions and welding parameters demonstrated that major element losses were not observed in base metal, HAZ and weld metal.
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