Methods of Weld Root Purging for Pipe Welding

摘要

In pipe welding where joints are designed to withstand stress in service, to be free from product entrapment or offer good flow characteristics, special consideration needs to be given to weld metallurgy and bead profile, especially at the weld root. The mechanical properties of welds, particularly their fatigue properties, can be influenced significantly by their shape and composition. In particular, the weld root requires a positive reinforcement. combined with smooth transition from weld to base material if optimum mechanical strength, flow characteristics and lack of product entrapment are to be realized.