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。
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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