Blu-ray licensing level narrow gap arc welding steel molds for construction projects and over 16mm in diameter in the horizontal bar on-site connection. A diameter of 20mm steel welded joints, only two electrodes with a time of two minutes. This special mold steel welding mode and the mode by the end of two parts, a semi-circular open end of the central pool model; the middle to open a conical die with the end of the weld pool model corresponds. Welding end in the mold between the two steel, welded joints in the pool, through the heat generated by arc welding arc welding of reinforcing bars together. From environmental site constraints, simple operation, equipment investment is small, easy to welding quality assurance, has obvious economic benefits. Welcome to the construction industry friends and cooperation.