张力减径焊管的压扁性能研究

研究了高频焊接钢管在焊接及热轧张力减径后组织和压扁性能的变化。研究结果表明:高频焊接过程除造成焊接热影响区与基体的组织差异外,还改变了钢中金属流线的方向和连续性;焊管经热轧张力减径后,随变形量的增加而变化的热影响区组织与基体组织趋于一致;焊接过程中金属流线方向的改变及钢中夹杂物数量较多,将导致压扁试验时断口多在焊接热影响区一侧。

Research on flattening property of stretch-reduced welded tube

The research is focused on changes of the structure and flattening property of the hi-frequency welded tube after welding and hot- rolling/stretch-reducing. The research reveals that the hi-frequency welding process not only causes the difference between the structure of the metal under the thermal effect by welding and the structure of the base metal, but also makes changes of orientation and continuity of the metal flow line in the steel; after hot-rolling/ stretch-reducing the said structure of the metal under thermal effect and structure of the base metal, both changing along with the increase of the deformation amount of the work piece become similar; change of the metal flow line orientation during welding and the significant amount of inclusions in the steel are responsible for the fact that during flattening test, the fracture quite often take places at the side of the test piece under thermal effect by the welding.