Subsequently, molten (L1) is introduced to the inner circumferential wall side of the outer tubular body (14) while sustaining rotation of the tubular die (22) thus forming an inner tubular body (12).

随后，在筒状模具(22)持续旋转的同时，将熔体(L1)引到所述外筒状体(14)的内周壁侧，从而形成内筒状体(12)。

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Welded pipe that bended by hot bending method with a set of specific die and welded by plasma arc welding method was used as tubular blank of SPF.

采用焊管作为管坯 ，焊管弯曲采用专用模具热弯 ，焊接采用等离子弧焊。超塑成形采用多层模结构 ，用模具来控制波形。

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