| 摘要 |
PURPOSE:To improve the welding workability by fixing a groove cross section between the branch pipe groove face and the base pipe surface extending over a full circle of a joint to perform the welding. CONSTITUTION:A bevel angle phi of a branch pipe 2 is expressed with a formula I as a function of its coordinate angle theta and a welding robot 8, a microcomputer 9, etc., are arranged in combination. The lower edge of the branch pipe 2 is formed to a shape having the level angle phi based on the formula I via an NC gas cutting machine, etc., and then, the edge penetration along the base pipe outside diameter is carried out. The groove shape dimensions such as a groove width, a groove angle, etc., in case the branch pipe 2 is fitted to the base pipe 1 and the tack welding is performed are calculated. Next, the object position of the welding at the time of the automatic welding via a robot 8 and a computer 9 is calculated to perform the welding. By this method, since the welding with the fixed groove cross section is performed, the full-circled welding can be performed with the same number of beads. Accordingly, the welding workability is improved.
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