Abstract
In recent years, as reinforced concrete structures become taller and larger, high strength reinforcing steel bars designated as SD 50 has been widely used, and the relevant design and construction methods have been developed. This report is focused on whether gas pressure welding is applicable to both blast furnace and electric furnace high strength reinforcing steel bars. In order to investigate its availability first the optimized welding condition was determined, and then the joint strength test was carried out. The test results showed that the welded joint strengths for both blast and electric furnace reinforcing bars meet the values specified in JIS, and that gas pressure welding is applicable to SD 50 reinforcing steel bars.
