Investigation of The Effect of HAZ Width on Weld Metal Electrical Properties in Arc Welded Joints

Year 2023, Volume: 7 Issue: 2, 112 - 117, 30.06.2023

Duygu Karaçay Karcı

https://doi.org/10.30939/ijastech..1301385

Abstract

This study was carried out in order to fill the gap in the literature and to increase the usability of welded joints as electrical connectors. For this purpose, shielded electrode metal arc welding and gas metal arc welding methods, which are frequently used in the industry, were used. In addition to mechanical tests such as microstruc-ture, tensile and hardness of the joints made at different heat inputs, electrical con-ductivity tests were also performed and the results were evaluated together. According to the results obtained, electrical conductivity is lower in arc welding joint with shielded electrode, in other words, the weld metal has reduced conductivity. In the gas arc welding, the electrical conductivity five times more than in the electrode welding. In MAG welding, at the highest heat input 0.78 kJ/mm, 186.33 HV hardness was measured, while 191.33 HV hardness was measured at 0.60 kJ/mm, the lowest heat input. While 386.5 MPa tensile strength was obtained at 0.78 kJ/mm, 377 MPa tensile strength was measured at 0.60 kJ/mm heat input.
In SMAW, 163 HV hardness was obtained at the highest heat input as 1.47 kJ/mm, while the tensile strength of the weld metal was measured as 343.5 MPa and the elec-trical resistance was measured as 21.5 Ohm. The electrical resistance was measured as 11.86 Ohm, with a 384 MPa tensile strength and a 174 HV hardness at the lowest heat input 1.17 kJ/mm. It was determined that as the weld metal hardness increased, the electrical conductivity decreased.
The relation between the test findings and their interpretation are detailed in the study.

Keywords

electrical conductivity, gas metal arc welding, heat affected zone, shielded metal arc welding

Supporting Institution

Birikim Mühendislik

References

• [1] Anık S. Welding Technology from the Past to the Space Age, Its Place in Today's Industry. 3.Denizli Material Symposium; 1989, Denizli.
• [2] Aslanlar S. Welding Technology and Applications 2009.
• [3] BARAN M. Joining of carbon steel and copper materials by electric arc, TIG and MIG weldings methods and investigation of their properties [Master Thesis] Graduate School of Natural and Applied Sciences, Dumlupınar University; 2007.
• [4] Ceyhun V, Sönmez U. Investigation of Strength, and Micro-structural Properties of Welded Joints in Welding of St 37-2 (S235JR) Steels with Cored Wire Electrode, VIII. International Conference on Welding Technologies and Exibition,2011.
• [5] Sarıcaoğlu N, Çam T, Aydın S, Kurt A. Çok Pasolu Kaynaklar-da Isı Girdisinin Kaynak Metaline Etkisi, 5th International Con-ference on Welding Technologies and Exibition (ICWET’18), 2018; Saraybosna, Bosnia and Herzegovina.
• [6] İrsel G. Study of the microstructure and mechanical property relationships of shielded metal arc and TIG welded S235JR steel joints, Materials Science and Engineering: A 2022; 830, 142320.
• [7] Eslami N, Harms A, Henke B. Electrical and mechanical prop-erties of friction stir welded Al-Cu butt joints. Weld World 63 2019; 903–911.
• [8] Khajeh R, Jafarian H. R, Seyedein S, Jabraeili R, Eivani A, Park N, Kim Y. Microstructure, mechanical and electrical prop-erties of dissimilar friction stir welded 2024 aluminum alloy and copper joints. Journal of Materials Research and Technolo-gy 2021;14, 1945 – 1957.
• [9] Kurt A, Küçüköner H. Effect of Pressure Period on Combina-bility and Electrical Conductivity in Cold Pressure Welding. 5th International Conference on Welding Technologies and Exibi-tion (ICWET’18) 2018; Saraybosna, Bosnia and Herzegovina.
• [10] Santos T, Vilaca P,Miranda R. M. Electrical conductivity field analysis for evaluation of FSW joints in AA6013 and AA7075 alloys. Journal of Materials Processing Technology 2011; 211, 174 – 180.
• [11] Bautista J. R, Avilés F, Oliva A. I, Ceh O, Corona J. E. Correlations between mechanical stress, electrical conductivity, and nanostructure in Al films on a polymer substrate. Mater Charact 2010;61(3):325-329.
• [12] Hellier C. J. Handbook of Nondestructive evaluation, first ed. CRC Press, Boca Raton, 2001.
• [13] Threadgill P. L, Leonard A. J, Shercliff H. R, Withers P. J. Friction stir welding of aluminium alloys. International Mate-rials Reviews 2009; 54(2), 49-93.
• [14] TS EN ISO 5817, Welding - Fusion-welded joints in steel, nickel, titanium, and their alloys (beam welding excluded) - Quality levels for imperfections. Turkish Standards Institution 2014; Ankara, 2-38.
• [15] Sarıcaoğlu N, Çam T, Aydın S, Kurt A. Effect of Heat Input on Weld Metal in Multi-Pass Welds, 5th International Conference on Welding Technologies and Exibi-tion(ICWET’18) 2018; Saraybosna, Bosnia and Herzegovina.
• [16] Kaya Y. An investigation of joinability of S235JR and S355JR construction steel by MAG welding method with cored wire electrode. Politeknik Journal 2018; 21, 597-602.
• [17] Samer Ş. Effect of Metallurgical Structure on the Electri-cal Conductivity of Low Carbon Steel [Master Thesis]. Istanbul Technical University, Natural and Applied Sciences;1998.