| 摘要 |
PURPOSE:To prevent the burn-through and high-temp. cracking and to improve working efficiency by specifying the groove shapes on the front and rear side of the butt part where welding members are butted. CONSTITUTION:A surface groove 2 having 3 deg.(+2 deg., -0 deg.) groove angle theta1, 4+ or -0.5mm. root radius R1 in the bottom of the groove and 4+ or -0.5mm. length l1 in the horizontal part of the bottom of the groove is formed on the front side of the butt part where welding members 1a, 1b are butted to each other. A rear groove 4 having 25 deg.+ or -0.5mm. angle theta2 between the plane perpendicular to the rear surface and edge working face 3 of the welding members and 3+ or -0.5mm. root radius R2 in the base part of the groove is formed on the rear surface side corresponding to the groove 2. The spacing l2 between the bottom part of the groove 4 and the bottom part of the groove 2 is set at 4+ or -0.5mm. and the spacing l3 between the bottom part of the groove 4 and the rear surface is set at 5+ or -1mm.. Submerged arc welding is thus performed. |
