Mechanical Properties of Welded Deformed Reinforcing Steel Bars

  • Ghafur H. Ahmed Department of Highway Engineering, Technical Engineering College, Hawler Polytechnic University, Kurdistan Region.
Keywords: Deformed bar, heat input, strength and ductility reduction, welding, weld groove


Reinforcement strength, ductility and bendability properties are important components in design of reinforced concrete members, as the strength of any member comes mainly from reinforcement. Strain compatibility and plastic behaviors are mainly depending on reinforcement ductility. In construction practice, often welding of the bars is required. Welding of reinforcement is an instant solution in many cases, whereas welding is not a routine connection process. Welding will cause deficiencies in reinforcement bars, metallurgical changes and re-crystallization of microstructure of particles. Weld metal toughness is extremely sensitive to the welding heat input that decreases both of its strength and ductility. For determining the effects of welding in reinforcement properties, 48 specimens were tested with 5 different bar diameters, divided into six groups. Investigated parameters were: properties of un-welded bars; strength, ductility and density of weld metal; strength and ductility reduction due to heat input for bundled bars and transverse bars; welding effect on bars’ bending properties; behavior of different joint types; properties of three weld groove shapes also the locations and types of failures sections. Results show that, strength and elongation of the welded bars decreased by (10-40%) and (30-60%) respectively. Cold bending of welded bars and groove welds shall be prevented.


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Author Biography

Ghafur H. Ahmed, Department of Highway Engineering, Technical Engineering College, Hawler Polytechnic University, Kurdistan Region.
Department of Highway Engineering, Technical Engineering College


Achillopoulou, D., Pardalakis, T. and Karabinis, A., 2013. Investigation of Force Transfer Mechanisms in Retrofitted RC Columns With RC Jackets Containing Welded Bars Subjected to Axial Compression. In: 4th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Kos Island, 12–14 June 2013, Greece.

Alk, A., Savvopoulos, P. and Dimitrov L., 2001. Design Problems in Lap Welded Joints of Reinforcing Steel Bars, Greece: Department of Mechanical Engineering and Aeronautics, University of Patras.

American Concrete Institute, 2011. ACI318-11 Building Code Requirements for Structural Concrete and Commentary, USA: 38800 Country Club Drive Farmington Hills, MI 48331, ACI.

American Institute of Steel Construction, 2005. AISC-LRFD Specification for Structural Steel Building: Load & Resistance Factor Design, Chicago, AISC.

American Society for Testing and Material, 2010. ASTM A1064M-10 Standard Specification for Steel Wire and Welded Wire Reinforcement, Plain and Deformed, for Concrete, USA: ASTM International.

American Society for Testing and Material, 2005. ASTM A184M-05 Standard Specification for Welded Deformed Steel Bar Mats for Concrete Reinforcement, USA: ASTM International.

American Society for Testing and Material, 2010. ASTM A370-10 Standard Test Methods and Definitions for Mechanical Testing of Steel Products, USA.

American Society for Testing and Material, 2009. ASTM A615M-09b Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement, 09b edn., USA: ASTM International.

American Welding Society, 2010. AWS A3.0/A3.0M-10 Standard Welding Terms and Definitions: AWS.

American Welding Society, 2012. AWS A5.1/A5.1M:12 Specification for Carbon Steel Electrodes for Shielded Metal Arc Welding, AWS.

American Welding Society, 2011. AWS D1.4/D1.4M:11 Structural Welding Code-Reinforcing Steel: AWS.

Bahman, A. and Alialhosseini, E., 2010, Change in Hardness, Yield Strength and UTS of Welded Joints Produced In ST37 Grade Steel, Indian Journal of Science and Technology, 3(12), pp.1162-1164.

Bohler Welding, 2005. Welding Guide, Schwei B Technik Austria, [online] Available at: <> [Accessed: June 2014].

Choi, E., Park, S., Cho, B. and Hui, D., 2013. Lateral reinforcement of welded SMA rings for reinforced concrete columns, Journal of Alloys and Compounds, 677(1), pp.756-759.

Chvertko,Y., Skachkov, I. and Chvertko, P., 2011. Technology of flash-butt welding of reinforcement bars in construction of structures of monolithic reinforced concrete, Ukraine: National Technical University of Ukraine Kyiv Polytechnic Institute.

Concrete Reinforcing Steel Institute, 2004. CRSI, Assembling Reinforcing Bars by Fusion Welding in the Fabricating Shop, 933 N. Plum Grove Rd., Schaumburg, Illinois 60173-4758: CRSI.

Elijah K., 2010. Development of Constitution Diagram for Dissimilar Metal Welds in Nickel Alloys and Carbon and Low-Alloy Steel, M.Sc. Thesis: The Ohio State University.

Franchi, A. and Crespi, P., 2007. Some Recent Results of the Research on Steel Rebar, Italy: Department of Structural Eng., Politecnico of Milano, ECSC Research Program.

Germanischer Lloyd Aktiengesellschaft, 2000. GL-00 Materials and Welding: Design, Fabrication and Inspection of Welded Joints, July 2000, II, Part 3, Chapter 2. Hamburg-Germany: GL.

Hakansson, K., 2002. Weld metal properties for extra high Strength Steels, Ph.D. Thesis: The Royal Institute of Technology.

James, F., 2013. SMAW Facilitator’s Guide, Lincoln Foundation: Lincoln Global Inc.

Kim, J., Frost R., Olson D. and Biander, M., 1987. Effect of Electrochemical Reactions on Submerged Arc Weld Metal Compositions, journal of Welding research supplement, April 1990, Center for Welding Research. Department of Metallurgic Engineering, Colorado School of Mines (paper presented in the 68th annual AWS meeting, Chicago, held march 1987), pp.447-453.

Lincoln E., 2014. Welding Guide: Stick Electrode Properties and Techniques, [online] Available at: <> [Accessed: June 2014].

Marten L., 2004. The Avesta Welding Manual, Practice and Products for Stainless Steel Welding, Sweden: Avesta Welding AB, Edita Vastra Aros.

Nikolaou, J. and Papadimitriou, G., 2004. Mechanical Properties of Lap-Welded Reinforcing Steel Bars used for Repairing Damaged Reinforced Concrete Structures, Journal of materials and structures, V37, (Dec. 2004), pp.698-706.

Nilson, H., Darwin, D. and Dolan, W., 2004. Design of Concrete Structures, 13th edn.: McGraw Hill Companies.

Nurnberger, U., 2005. Stainless Steel Reinforcement – A Survey, Otto-Graf Journal, 16, pp.111-138.

Omer, W., Scott, R., Duane, K. and Marie, Q., 1999. Fabricators and Erectors; Guide to Weld Steel Construction: James F. L., Arch Weld Foundation.

Popović, O., Prokić, R., Burzić, M. and Milutinović, Z., 2010. The Effect of Heat Input on the Weld Metal Toughness of Surface Welded Joint, Faculty of Mechanical Engineering. In: 14th International Research/Expert Conference ”Trends in the Development of Machinery and Associated Technology”, Mediterranean Cruise, 11-18 September 2010, University of Belgrade, Serbia.

Scott R. F., 1999. Key Concepts in Welding Engineering: a Look at Heat Input, Welding Innovation Journal, 16 (1).

Serna, M., Puente, I., Clemos, I. and Lopez, A., 2002. Failure of Steel-Concrete Connection at the Kursaal Auditorium, Spain: Department of Structural Engineering, University of Navarra. ASCCS-Kursaal-EN.

Shultz, B. L. and Jackson, C. E., 1973. Influence of Weld Bead Area on Weld Metal Mechanical Properties, Welding Research Supplement, Department of Welding Engineering, The Ohio State University, pp.26-37.

The European Nations Standard, 2010. EN 1011-1/A1:10 welding - recommendations for welding of metallic materials - part 1: general guidance for arc welding: EN.

Wai, C. and Eric, M., 2005. Steel Structures, in Handbook of Structural Engineering, Structural Design Section II. : CRC Press Taylor & Francis Group, NW Boca Raton, FL 33487-2742, pp.4.1-4.103.

Weld-D-Arc, 2013. Welding Electrode Classification, [online] Available at: <> [Accessed: August 2014].

How to Cite
Ahmed, G. H. (2015) “Mechanical Properties of Welded Deformed Reinforcing Steel Bars”, ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, 3(1), pp. 28-39. doi: 10.14500/aro.10059.