| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a pipe for a fuel tank having a ring projection providing airtightness and welding strength, and a method for welding the same. <P>SOLUTION: In this pipe for the fuel tank including the ring projection in a flange, the ring projection has an embossed shape. A cross-sectional shape of the ring projection before welding the projection is a cross-sectional shape having a width W of a projection of 1.5-3t and a height H of the projection of 0.3-1.0t, when a flange surface in contact with an electrode is formed into a truncated recessed shape, an angleθof a trapezoidal shape is 60-120°, the shape of the flange surface on a welded part side is a round projection shape and flange thickness is t. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
