| 摘要 |
PROBLEM TO BE SOLVED: To provide structure body having deep penetration, low thermal strain and high strength even in the state where the amount of heat input is low in the rectangular bent part through an L-shaped or round part as making the best use of the advantage of friction/agitation joining. SOLUTION: In the structural body of vehicles, aircraft and buildings which are composed of the combination of wide panel bodies such as side body structures, floor body structure and roof body structures, the joining of the planar parts or parts having a large curvature of the wide panel of the body structures is carried out by the friction/agitation joining and joining in the angle changing parts through approximately L-, dog-leg- or V-shaped rectangular bent part or round parts having a small radius ( hereinafter referred to as a bent part including both parts. ) is carried out by submerged arc welding. The submerged arc welding is carried out so that the arc is generated to the interior of the base metal by maintaining the arc length from the tip of an electrode to the surface of the base metal not longer than 2 mm in the atmosphere of shield gas of the gaseous nitrogen of 1-40 vol.% to which a shield gas such as argon, helium or a gaseous mixture of them is added. COPYRIGHT: (C)2004,JPO |
