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<p>Focusing on the push-bending forming of a large diameter-thickness ratio stainless steel elbows with a small bending radius of 1D, this thesis aims to obtain the elbow without defects via rolling and welded tube blanks. In simulation analysis, the effects of differential lubrication conditions of the tube blank and the magnitude of the thrust from the flexible rod to the polyurethane blocks (<i>F</i><sub>2</sub>) on wrinkling and wall thickness are investigated. Based on the simulation, forming tests were conducted, and the results agreed well with the simulation results. The effects of different weld positions on forming quality, as well as the effects of forming on weld quality, are studied through forming tests, and the weld strength is verified through burst test. The results show that superior forming results can be achieved when the target elbow adopts a differential lubrication method with larger intrados friction and smaller extrados friction, under 22&#xa0;MPa of <i>F</i><sub>2</sub>, and with weld seam located on the upper or lower side of bending. Metallographic analysis before and after forming shows no significant changes, and the weld strength is comparable to that of the base material, having no obvious influence on the pressure-bearing capacity of the elbow.</p>

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Research on push bending of welded stainless steel tubes with large diameter-thickness ratio and small bending radius

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Hanming Jian,
  • Wukai Li,
  • Bo Chen,
  • Sule Feng,
  • Xuefeng Xu,
  • Yubin Fan,
  • Caiyuan Lin

摘要

Focusing on the push-bending forming of a large diameter-thickness ratio stainless steel elbows with a small bending radius of 1D, this thesis aims to obtain the elbow without defects via rolling and welded tube blanks. In simulation analysis, the effects of differential lubrication conditions of the tube blank and the magnitude of the thrust from the flexible rod to the polyurethane blocks (F2) on wrinkling and wall thickness are investigated. Based on the simulation, forming tests were conducted, and the results agreed well with the simulation results. The effects of different weld positions on forming quality, as well as the effects of forming on weld quality, are studied through forming tests, and the weld strength is verified through burst test. The results show that superior forming results can be achieved when the target elbow adopts a differential lubrication method with larger intrados friction and smaller extrados friction, under 22 MPa of F2, and with weld seam located on the upper or lower side of bending. Metallographic analysis before and after forming shows no significant changes, and the weld strength is comparable to that of the base material, having no obvious influence on the pressure-bearing capacity of the elbow.