Volume 24, Issue 8 (August 2024)
Modares Mechanical Engineering 2024, 24(8): 533-543 |
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mohammadi soleymani M, Mehrabi gohari E, Khorami S. Investigation of Behavior and Failure Mechanism of Welding ST52 Steel Structures at Negative Temperature. Modares Mechanical Engineering 2024; 24 (8) :533-543
URL: http://mme.modares.ac.ir/article-15-77327-en.html
URL: http://mme.modares.ac.ir/article-15-77327-en.html
1- Department of Mechanical Engineering, Payame Noor University, Tehran , mmsoleymani@pnu.ac.ir
2- National University of Skills, Tehran
3- Master of Structural Engineering, Islamic Azad University, Bandar Abbas
2- National University of Skills, Tehran
3- Master of Structural Engineering, Islamic Azad University, Bandar Abbas
Abstract: (644 Views)
In this research, two examples of ST-52 steel welding joints were performed by the SMAW welding method using low-hydrogen alkaline electrodes E7018 and E8018. The hardness, tensile strength, and impact toughness of weld were examined and studied at ambient temperature and -29 °C. The hardness test results showed that the highest hardness at the weld metal region belonged to the welding metal E8018. The hardness values for the base metal and the heat-affected area also indicated that the similar weld metal-like behavior is the same in the two samples. The impact test results demonstrated that the mean impact energy of the weld metal E7018 at ambient temperature was higher than E8018. Also, the mean impact energy at -29 °C for the weld metals E8018 and E7018 was equal to 56 J and 73 J, respectively. According to the results, the weld metal E8018 at a temperature of -29 °C shows a more brittle fracture behavior and lower impact toughness than the E7018 weld metal. The results of the weld tensile test revealed that the final weld strength of both filler metals was higher than 546 MPa so that the tensile sample failed from the ST-52 base metal site. According to the Tenth Article of the National Building Regulations of Iran as well as the Seismic Rules of the Regulation AISC 341-10, filler metals E7018 and E8018 meet the requirements of the weld final strength and impact toughness at ambient temperature and -29 °C.
Article Type: Original Research |
Subject:
Welding
Received: 2024/10/4 | Accepted: 2024/11/10 | Published: 2024/07/31
Received: 2024/10/4 | Accepted: 2024/11/10 | Published: 2024/07/31
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