Laser welding method is widely used in the welding of different materials. Deep penetration, low heat input, narrow heat affect zone, low stress-strain, and distortion are important features of this welding method as compared to other joint methods. Today, it is possible to see the applications of laser welding in the repair of precious metals, moulds, and machine parts. The laser welding method is preferred in the manufacture of many parts of precious metals. Titanium and particularly Grade 2 alloys are used in a wide range of applications, from medical applications to the aerospace industry applications. Since titanium is made of precious metals, it is of great use in manufacturing without much scrap. In the joints made by welding, it is estimated that the amount of scrap loss will decrease as a result of the potential to predict the distortion that the material will undergo and to provide more controlled planning of the current production. In this study, the weldability of 0.6 mm sheet materials with laser butt-welding was investigated. The effects of pulsed micro laser welding parameters on the microstructure, mechanical properties, and surface morphology of the fractures were investigated. As a result of the microstructure examination, it was found that cross-section narrowing was seen without filling welding. Fracture of the welded joints occurred in the base metal, showing an ultimate tensile strength of approximately 248 MPa with an elongation of 26.7 %.
Malzeme teknolojilerinin gelişimi ile birlikte AHSS (Advanced-High Strength Steel) adı verilen üçüncü nesil geliştirilmiş yüksek gerilimli saclar can güvenliği amacıyla otomotiv imalatında sıklıkla kullanılmaktadır. Şase, kapı takviye sacı ve direk imalatında kullanılan bu sacların birleştirilmesi genellikle elektrik direnç nokta kaynağı ile yapılmaktadır. Elektrik direnç kaynağı, otomotiv imalat sektöründe robot kullanarak otomatikleşme ve seri üretime olanak sağlaması nedeniyle önemli bir yer tutmaktadır. Bir diğer önemli nokta ise kaynaklı birleştirme esnasında kaynak kalitesini etkileyen kaynak parametreleridir. Elektrot baskı kuvveti, kaynak için harcanan süre ve kaynağın gerçekleştirileceği akım değeri parametreleri elektrik direnç kaynağı için oldukça önemlidir. Bu çalışmada, 1200M ve DP800HF AHSS sacların elektrik direnç kaynağında kullanılan kaynak akımı, kaynak zamanı ve kaynak çene baskı kuvvetlerinin nokta çekirdeği (kaynak dikişi) sertliği üzerine etkisinin, Taguchi yöntemiyle optimize değerleri incelenmiştir. Optimizasyon uygulamasında kullanılan Taguchi metodunda L 18 ortagonal serisi kullanılmıştır. Bu seri ile birlikte optimizasyon sonuçlarının kontrol edilmesinde sinyal/gürültü (S/N) oranı belirleyici olmuştur. Deneysel çalışmalar ve optimizasyon işlemi sonuçları incelendiğinde gerçek uygulama ve Taguchi optimizasyonu ile yapılan analizden elde edilen sertlik sonuçlarının birbirine yakın olduğu görülmüştür.
Electrolytic hard chrome plating is applied to improve the surface properties of metals and add a decorative look. In this study, hard chrome plating was applied to low carbon steel in various parameters by means of an electrolytic method. The plating and metal surface of the specimen were analysed using a scanning electron microscope (SEM). Following SEM analyses, microhardness measurements from the plating to the base metal in the samples were conducted at 100 g. The wear resistance in the plated samples was determined by the pin-on-disc method. Moreover, the surface morphology was examined by SEM and optic profilometer subsequent to the wear experiment. The results showed that the hard chrome plating, which was applied at 0.4 A × m-2 current density, 100 mm anode-cathode distance and 60 °C bath temperature, yielded the highest wear resistance and hardness.
In this study, DD13 sheet materials used in automobile swing manufacturing were welded with GMAW (Gas Metal Arc Welding) welding method with different parameters such as welding method, welding amperage, and welding speed. The optimized value of the welding parameters, which will give the lowest hardness value in the weld seam hardness, was calculated by the Taguchi method. In addition, the heat input values that are thought to affect the hardness change were calculated, and the results were used to interpret the hardness change and Taguchi optimization values. After the experimental studies, the optimized value was compared with the actual results, and the verification test was performed. As a result of the optimization process, the lowest hardness value was estimated as 172.98 HV0.1 in MAG welding performed at 420 min/mm welding speed, 290 A, and 33.6 V parameters. The validation test result was found to be consistent with 173.4 HV0.1. Based on these values, finite element analysis (FEM) was performed with Simufact Welding 8.0 software. As a result of the investigation, the weld macrostructure, thermal changes, and the amount of distortion were examined. The results obtained are in agreement with the validation experiments.
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