AUTOMATIC RAIL WELDING BACKING MATERIAL AND ITS USING METHOD

摘要

PROBLEM TO BE SOLVED: To excellently make a reverse side bead in this backing material for executing one-side welding to a rail base part with a gas shield arc welding method at the time of automatically welding a rail on the site. SOLUTION: This is a solidified forming flux having projecting and recessed parts which are widen symmetrically right and left with respect to the center of the weld line at an angle of 15 deg. to 60 deg. to the center line and have depth of 2mm to 50mm formed on the side of abutting on the back face of foot part of a rail and further the recessed part of the projection and recessed parts is put continuously in a direction of crossing the weld line, and the length thereof is partitioned finely by 30mm to 50mm in the welding line direction. Further, a glass fiber sheet is attached on the front face on the side of abutting on the rail.