| 摘要 |
PURPOSE:To eliminate the blowout of granular body and the generation of penetraters at pipe making time by performing a high frequency welding under the conditions of satisfying the specified equation of the opening width of the butt part of formed cylindrical bodies and the breadth of the granular body to be filled in the cylindrical body. CONSTITUTION:A butt part 10 is joined integrally by high frequency welding by making a cylindrical body 6 by abutting both end parts in the width direction of a strip metal 2, after filling the prescribed granular body 4 which contains magnetic components at the inner part by forming the strip metal 2 in opening groove shape. In this case, the welding is performed by adjusting so that the opening width G of the cylindrical body 6 at the position where a high frequency induction coil or feeder is arranged and the breadth (d) of the filling granular body 4 can satisfy the equation G/d <=0.9. In this way the blowout of the granular body at pipe making time and the generation of penetraters are eliminated and a sound composite pipe is obtd.
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