Al7039 Zırh Plakalarına Sürtünme Karıştırma Kaynağı Öncesi Uygulanan Ön Isıtmanın Geliştirici Etkileri

Öz

Bu çalışmada, belirlenen boyutlarda hazırlanan Al7039 levhalar, öncelikle oda sıcaklığında sürtünme karıştırma kaynağı yöntemi ile birleştirildi. Birleştirme esnasında kaynak başlangıç ve bitiş noktalarına yakın bölgelere yerleştirilen termokupl uçları sayesinde ilerleme kenarı ve yığılma kenarında oluşan sıcaklıklar belirlendi. Elde edilen sıcaklık değerleri kullanılarak kaynak öncesi ana metalin ön ısıtma sıcaklığı tahmin edildi. Aynı boyutlarda hazırlanan Al7039 levhalar belirlenen ön ısıtma sıcaklığına kadar ısıtıldıktan sonra aynı kaynak parametreleri ile birleştirildi vekaynak sırasında aynı bölgelere yerleştirilen termokupllar vasıtasıyla ısı dağılımları belirlendi.Farklı ısı girdileri ile birleştirilen iki numune arasındaki ısı dağılımı incelenerek, bu ısı dağılımının kaynak bölgesindeki etkileri mekanik testler ve mikro yapı görüntüleri ile ortaya konuldu.

Anahtar Kelimeler

• Al7039 alaşımı,SKK,Ön ısıtma

Developer Effects of Pre-Heating Applied to the Al7039 Armor Plates Prior to the Friction Stir Welding

Öz

In this study, Al7039 plates at certain dimensions were first joined via friction stir welding (FSW) method at room temperature. During this process, thermocouple tips positioned closely to the each side of the weld helped determine temperatures on the advancing and retreating sides. These temperature values were used to estimate pre-heating temperature of the base metal prior to the welding process. After Al7039 plates at identical dimensions were heated to a certain temperature, they were joined using the same welding parameters, and the heat distribution was determined thanks to the thermocouples positioned on the same zones. The heat distribution between two samples which were joined using different heat inputs were analyzed to reveal the impact of this heat distribution on the weld zone via mechanical tests and micro structure images.

Anahtar Kelimeler

• Al7039 alloy,FSW,Pre-heating

Kaynakça

1. 1. Rometsch, P. A., Zhang, Y. & Knight, S. Heat treatment of 7xxx series aluminium alloys - Some recent developments. Transactions of Nonferrous Metals Society of China (English Edition) 24, 2003–2017 (2014).
2. 2. Ludtka, G. M. & Laughlin, D. E. The Influence of Microstructure and Strength on the Fracture Mode and Toughness of 7XXX Series Aluminum Alloys. 13, (1982).
3. 3. Avci, U. & Temiz, Ş. A new approach to the production of partially graded and laminated composite material composed of SiC-reinforced 7039 Al alloy plates at different rates. Composites Part B: Engineering 131, 76–81 (2017).
4. 4. Pérez-Bergquist, S. J., Gray, G. T. R., Cerreta, E. K., Trujillo, C. P. & Pérez-Bergquist, A. The dynamic and quasi-static mechanical response of three aluminum armor alloys: 5059, 5083 and 7039. Materials Science and Engineering A 528, 8733–8741 (2011).
5. 5. Maleki, E. Artificial neural networks application for modeling of friction stir welding effects on mechanical properties of 7075-T6 aluminum alloy. IOP Conference Series: Materials Science and Engineering 103, 12034 (2015).
6. 6. Kurt, H. I. Influence of hybrid ratio and friction stir processing parameters on ultimate tensile strength of 5083 aluminum matrix hybrid composites. Composites Part B: Engineering 93, 26–34 (2016).
7. 7. Seidel, T. U. & Reynolds, a. P. Visualization of the material flow in AA2195 friction-stir welds using a marker insert technique. Metallurgical and Materials Transactions A 32, 2879–2884 (2001).
8. 8. Reynolds, a. P. Visualisation of material flow in autogenous friction stir welds. Science and Technology of Welding and Joining 5, 120–124 (2000).

9. 9. Peel, M., Steuwer, A., Preuss, M. & Withers, P. J. Microstructure, mechanical properties and residual stresses as a function of welding speed in aluminium AA5083 friction stir welds. Acta Materialia 51, 4791–4801 (2003).
10. 10. Singh, R. K. R., Sharma, C., Dwivedi, D. K., Mehta, N. K. & Kumar, P. The microstructure and mechanical properties of friction stir welded Al-Zn-Mg alloy in as welded and heat treated conditions. Materials and Design 32, 682–687 (2011).
11. 11. Kumar, K. & Kailas, S. V. On the role of axial load and the effect of interface position on the tensile strength of a friction stir welded aluminium alloy. Materials and Design 29, 791–797 (2008).
12. 12. Cavaliere, P., Campanile, G., Panella, F. & Squillace, A. Effect of welding parameters on mechanical and microstructural properties of AA6056 joints produced by Friction Stir Welding. Journal of Materials Processing Technology 180, 263–270 (2006).
13. 13. Sharma, C., Dwivedi, D. K. & Kumar, P. Influence of pre-weld temper conditions of base metal on microstructure and mechanical properties of friction stir weld joints of Al-Zn-Mg alloy AA7039. Materials Science and Engineering A 620, 107–119 (2014).
14. 14. Aydın, H., Bayram, A., Uğuz, A. & Akay, K. S. Tensile properties of friction stir welded joints of 2024 aluminum alloys in different heat-treated-state. Materials & Design 30, 2211–2221 (2009).
15. 15. Chen, Y., Liu, H. & Feng, J. Friction stir welding characteristics of different heat-treated-state 2219 aluminum alloy plates. Materials Science and Engineering A 420, 21–25 (2006).
16. 16. Yan, J. & Reynolds, a. P. Effect of initial base metal temper on mechanical properties in AA7050 friction stir welds. Science and Technology of Welding and Joining 14, 282–287 (2009).
17. 17. Poongkundran, R. & Senthilkumar, K. Effect of preheating on microstructure and tensile properties of friction stir welded AA7075 aluminium alloy joints. Brazilian Archives of Biology and Technology 59, 1–15 (2016).
18. 18. Khan, N. Z., Siddiquee, A. N., Khan, Z. A. & Shihab, S. K. Investigations on tunneling and kissing bond defects in FSW joints for dissimilar aluminum alloys. Journal of Alloys and Compounds 648, 360–367 (2015).