On the Gas Pressure Welding of Large Diameter Deformed Concrete Bar

Abstract

Gas pressure welding is a common process used in the field to weld deformed concrete bars. However, when the bar diameter is greater than e.g. 30 mm, oxide inclusions are liable to form on the surface of gas pressure weld. Because of this phenomenon, the ioint reliability is often lowered.
The authors herein report a newly developed gas pressure welding process where an extremely rich content of acetvlen was is used and a highly reduced flame is produced so that the oxide inclusions decrease.
Deformed concrete bars of 51 mm diameter were welded by the developed process, and the mechanical properties of the joints were examined. The results showed highly improved reliability of thus welded joints.