For determining the effects of welding in reinforcement properties, 48 specimens were tested with 5 different bar diameters, divided into six groups. Weld metal toughness is extremely sensitive to the welding heat input that decreases both of its strength and ductility. Welding will cause deficiencies in reinforcement bars, metallurgical changes and re-crystallization of microstructure of particles. Welding of reinforcement is an instant solution in many cases, whereas welding is not a routine connection process. In construction practice, often welding of the bars is required. Strain compatibility and plastic behaviors are mainly depending on reinforcement ductility. 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.
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