Reinforced concrete columns supporting concrete arch bridges often face damage from corrosion and seismic actions. Rehabilitating these damaged columns frequently involves replacing corroded or compromised steel rebars. Welded joints offer a practical solution for connecting new rebar to existing ones, even in cases of irregular reinforcement. However, traditional welding methods have typically overlooked the importance of seam overstrength, resulting in brit- tle responses and plastic hinge formation in critical locations. To ensure a ductile failure mode, it is crucial to design these joints properly. In real-world rehabil- itation scenarios, time and cost constraints necessitate shorter welding seams. Therefore, ensuring adequate seam overstrength becomes paramount. This study investigates effective welding methods for connecting existing and new rebar seg- ments, addressing on-site challenges such as limited space and orientation. The authors propose a methodology for rehabilitating damaged RC columns based on the results of over 100 tensile tests conducted at Fuzhou University in China.