ONE SIDE WELDING METHOD OF BUTT-WELDED JOINTS

摘要

An one side welding method of butt-welded joints is provided to reduce the number of welding operations, thereby improve efficiency of the welding method by using both a component wire and a cut wire type welding filler material, thereby completing welding of welding joints through one submerged arc welding at a higher welding amount. An one side welding method of butt-welded joints includes the steps of: positioning two base metals(21) to be welded in such a shape that the base metals are oppositely directed and spaced apart from each other in a gap of 4 to 12 mm; attaching a backing material(22) to the positioned base metals such that the backing material is surface contacted with backsides of the base metals to seal the gap of the base metals; performing flux cored arc welding or a combination of flux cored arc welding and submerged arc welding two to three times at an upper side of the gap sealed by the backing material; filling a cut wire type welding filler material(23) and a welding flux in a space between the base metals and upper sides of the flux cored welds; and unwinding a wound composite wire that is a high efficiency welding wire to lower the welding wire toward the cut wire type welding filler material and the welding flux, applying set voltage and current to the welding wire to generate an arc, and heating the welding wire, the cut wire type welding filler material and the base metals using heat of the arc to weld the base metals by submerged arc welding.