This standard provides recommendations for the welding of cold-worked steel bars used in reinforced concrete construction. It covers material requirements, permissible welding processes, joint configurations, welder qualification, and testing procedures to ensure the integrity and strength of welded reinforcement.
Recommendations for welding cold worked bars for reinforced concrete construction
Quick Reference Values
Maximum Carbon Equivalent (CE)0.42 %
Tensile strength of butt weld joint100% of specified characteristic strength of the bar
Minimum length of weld in lap joints5 times the diameter of the smaller bar
Bend test angle for butt weld test piece90 degrees
Strength of a single lap jointShould be able to transmit the characteristic strength of the smaller diameter bar
Key Formulas
CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 — Carbon Equivalent
Practical Notes
Welding high-strength bars can significantly reduce ductility in the heat-affected zone (HAZ). Adherence to specified procedures, including pre-heating if necessary, is critical.
The Carbon Equivalent (CE) of the rebar is the most important parameter for weldability. Ensure the bar manufacturer's test certificate confirms CE is within the limit (≤ 0.42%).
Gas welding is strictly prohibited for welding reinforcement bars under this code.