| 摘要 |
A method for calculating the shape of a bead of a welded part determining an appropriate welding condition by solving the problem of multiple solution of when the shape causing a recess or undercut in the flange is determined by calculation. The geometry data on the object to be welded, the characteristic parameters of the object and welding environment, and the welding conditions are set. Under the welding conditions, the melting part of the object is inferred by heat conduction calculation. The coordinates are rotated about an axis parallel to the direction of the welding and/or about an axis perpendicular to the welding direction for the inferred melting part. A difference lattice is set for the coordinate-rotated melting part. The displacement of the melting part for which the difference lattice is set is calculated by a curved surface equation. The melting shape determined by the calculated displacement is rotated by the same angle of rotation as that of the coordinate rotation in the opposite direction to the rotation direction. The inference of the melting part by the heat conduction calculation, the coordinate rotation, the setting of the difference lattice, and the calculation of the displacement of the melting part are repeated until the calculation end criterion is met, thereby calculating the shape of the bead of the arc-welded part.
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