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A Study on the Role of Effective Parameters on the Mechanical Properties of Gas Pressure Welded Rebars | ||
| Iranian Journal of Materials Forming | ||
| دوره 11، شماره 3، مهر 2024، صفحه 13-20 اصل مقاله (2.66 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijmf.2024.50416.1300 | ||
| نویسندگان | ||
| B. Ghaffari؛ H. Daneshmanesh؛ S.M. Zebarjad* | ||
| Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran | ||
| چکیده | ||
| Gas pressure welding (GPW) is a type of solid-state welding developed as a branch of the oxyacetylene fuel gas welding process (OFW) that employs mechanical pressure. One of the main advantages of GPW is the reduction of rebar waste, as well as enhancing buildings' earthquake resistance due to the high strength of the rebar connection points. In this research, the factors affecting GPW and the mechanical properties of gas pressure-welded rebars were investigated. Tempcore rebars with diameters of 18 and 25 mm were welded at different pressures (17 to 21 MPa for 18 mm diameter and 22 to 28 MPa for 25 mm diameter) and varying times (40 to 60 seconds for 18 mm diameter and 60 to 110 seconds for 25 mm). Tensile, bending, and microhardness tests were conducted on the samples to evaluate their final properties. Additionally, the microstructure of the samples was examined using both optical and scanning electron microscopes. The results indicate that for Tempcore rebar, increasing pressure and heating time decreases the likelihood of forming oxide layers, resulting in improved ductility of the samples. The tensile test results show that longer heating times provide greater opportunities for recrystallization. The bending test results reveal that reduced pressure and welding time lead to brittleness in the samples, attributed to the presence of oxide particles and delayed recrystallization. Microhardness results show that the highest values are associated with samples welded at low pressure and low welding times. | ||
| کلیدواژهها | ||
| Gas pressure welding؛ Rebar diameter؛ Tensile properties؛ Microstructure؛ Bending behavior | ||
| مراجع | ||
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[1] Moustafa, M. (2016). Optimizing the welding parameters of reinforcing steel bars. Arabian Journal for Science and Engineering, 41(5), 1699-1711. https://doi.org/10.1007/s13369-015-1929-x
[2] Dabiri, H., & Kheyroddin A. (2021). An experimental comparison of RC beam-column joints incorporating different splice methods in the beam. Structures, 34, 1603-1613. https://doi.org/10.1016/j.istruc.2021.08.101
[3] Firmanto, H. (2022) Tensile strength and microstructure of rotary friction welded carbon steel and stainless steel joints. Journal of Manufacturing and Materials Processing, 7(1), 7. https://doi.org/10.3390/jmmp7010007
[4] Zanuy, C., & Díaz I. M. (2018). Stress distribution and resistance of lap splices under fatigue loading. Engineering Structures, 175, 700-710. https://doi.org/10.1016/j.engstruct.2018.08.067
[5] Yamamoto, R. (2007). Advances in gas pressure welding technology for rails. Railway Technology Avalanche, 17, 99-105.
[6] Yamamoto, R., Fukada, Y., Oishibash, H. (1998). Gas pressure welding method for steel reinforcing bars. Welding Research Supplement, 77(5), 188-192.
[7] Alderman, J. (1995). The January 17, 1995 Kobe earthquake: an EQE summary report. EQE International, San Francisco.
[8] Armstrong, I. (1971). Full-strength butt welds of reinforcing bars by the pressure-gas process. Bulletin of the New Zealand Society for Earthquake Engineering, 4(2), 270-284. https://doi.org/10.5459/bnzsee.4.2.270-284
[9] Ryuichi, Y., Yuichi, K., & Yasuto, F. (2014). Experimental examination for understanding of transition behavior of oxide inclusions on gas pressure weld interface: joining phenomena of gas pressure welding. Welding International, 28(7), 510-520. https://doi.org/10.2207/qjjws.28.167
[10] Jeon, J. (2015). A Study on the mechanical properties of gas pressure welded splices of deformed reinforcing bar. Journal of the Society of Disaster Information, 11(4), 520-526. https://doi.org/10.15683/kosdi.2015.11.4.520
[11] Baroutian, M. (2018). Laboratory investigation of the effect of various factors on the performance of rebar connection by forging method and its comparison with welded connections [Master’s thesis, Shahrood University].
[12] Saito, T., Yabe, Y., & Fujimori, T. (1985). An ultrasonic testing method for gas pressure welded joints of reinforcing steel bars. Ultrasonics, 23(3), 119-127. https://doi.org/10.1016/0041-624X(85)90060-5
[13] Issa, C. A., & Nasr, A. (2006). An experimental study of welded splices of reinforcing bars. Building and Environment, 41(10), 1394-1405. https://doi.org/10.1016/j.buildenv.2005.05.025
[14] Kheyroddin, A., Rouhi, S., & Dabiri, H. (2021). An experimental study on the influence of incorporating lap or forging (GPW) splices on the cyclic performance of RC columns. Engineering Structures, 241, 112434. https://doi.org/10.1016/j.engstruct.2021.112434
[15] Kheyroddin, A., & Dabiri, H. (2020). Cyclic performance of RC beam-column joints with mechanical or forging (GPW) splices; an experimental study. Structures, 28, 2562-2571. https://doi.org/10.1016/j.istruc.2020.10.071
[16] Shokrzadeh, M. R., Nateghi-Alahi, F., Mansoori, M. R., & Javadi, P. (2022). The improvement of the threaded-based mechanical splice by modifying the threaded system: Study of techniques cold rolling and rotating friction welding. Journal of Building Engineering, 320, 126198. https://doi.org/10.1016/j.jobe.2023.107964
[17] Dey, I., Ghosh, S. K., & Saha, R. (2019). Effects of cooling rate and strain rate on phase transformation, microstructure and mechanical behavior of thermomechanically processed pearlitic steel. Journal of Materials Research and Technology, 8(3), 2685-2698. https://doi.org/10.1016/j.jmrt.2019.04.006
[18] Gutscher, D., & Sun, J. (2006). Evaluation of improved gas pressure welding for in-track HAL service. Railway Track and Structures, 102(9).
[19] Sharbatdar, M. K., Jafari, O. M., & Karimi, M. S. (2018). Experimental evaluation of splicing of longitudinal bars with forging welding in flexural reinforced concrete beams. Advances in Concrete Construction, 6(5), 509-525. https://doi.org/10.12989/acc.2018.6.5.509 | ||
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