| 引用本文: | 强伟,路永新,袁银辉,孙粲.T形接头冷丝填充双热源协同焊接数值模拟[J].材料科学与工艺,2021,29(5):57-62.DOI:10.11951/j.issn.1005-0299.20200331. |
| QIANG Wei,LU Yongxin,YUAN Yinhui,SUN Can.Numerical simulation of T-joint welding with cold wire filling and double heat sources[J].Materials Science and Technology,2021,29(5):57-62.DOI:10.11951/j.issn.1005-0299.20200331. |
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| 摘要: |
| 为提高T形接头的焊接效率、降低其焊接变形,本文提出了冷丝填充双热源协同焊接的工艺方法,主要利用有限元模拟技术研究了厚度6 mm的5083铝镁合金T形接头双热源协同焊接温度场、应力场及变形特征。模拟结果显示,双热源热输入相同的情况下,T形接头焊接温度场在立板两侧呈对称椭圆形分布,椭圆长轴与焊接方向一致,热源后方区域的温度梯度小于前方,主要是同时受到电弧与凝固焊道热量的叠加作用所致,热量分布范围拓宽；底板x方向的纵向残余应力呈“多峰”状对称分布,近缝区以拉应力为主,应力峰值为111.6 MPa；远缝区以压应力为主,应力值随着远离焊缝而变大,原因是距离热源越远,焊接热应力越小,压应力峰值为73.4 MPa；立板y方向从底部到顶部呈从“拉”到“压”的演变趋势,纵向残余应力先减小后微增,近缝区应力峰值为183 MPa,远缝区应力峰值为33.5 MPa；T形接头的横向收缩变形最大,变形量峰值为1.727 mm,主要与熔池金属冷却凝固时横向剧烈收缩、“拉拽”热影响区和母材有关。 |
| 关键词: 双热源协同焊接 T形接头 温度场 应力场 焊接变形 |
| DOI：10.11951/j.issn.1005-0299.20200331 |
| 分类号:TG402 |
| 文献标识码:A |
| 基金项目:陕西省自然科学基础研究计划资助项目(2020JQ-768)；先进焊接与连接国家重点实验室开放课题研究基金(AWJ-21M21). |
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| Numerical simulation of T-joint welding with cold wire filling and double heat sources |
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QIANG Wei1, LU Yongxin1,2, YUAN Yinhui1, SUN Can1
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(1.School of Materials Science and Engineering, Xi′an Shiyou University, Xi′an 710065, China; 2.State Key Laboratory of Advanced Welding and Joining(Harbin Institute of Technology), Harbin 150001, China)
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| Abstract: |
| To improve the welding efficiency and reduce the welding deformation of T-joint, the technology of double heat source cooperative welding with cold wire filling was put forward. The temperature field, stress field, and deformation characteristics of 6 mm thick 5083 aluminum magnesium alloy T-joint with double heat sources were studied by finite element simulation technology. Simulation results show that the temperature field of T-joint presented a symmetrical elliptical distribution on both sides of the vertical plate under the equal heat input of double heat sources, and the long axis of the ellipse was consistent with the welding direction. The temperature gradient in the area behind the heat source was smaller than that in the front, which was mainly caused by the superposition of the heat from the arc and the solidification weld bead, and the heat distribution range was widened.The longitudinal residual stress in the x direction of the bottom plate was symmetrically distributed in a “multi-peak” shape, and the tensile stress was dominant in the near seam area, with the peak stress of 111.6 MPa. The compressive stress was dominant in the far seam area, and the stress value increased with the distance from the welding seam. The reason was that the farther away from the heat source, the smaller the welding thermal stress was, and the peak compressive stress was 73.4 MPa. From the bottom to the top of the vertical plate, the evolution trend was from “tension” to “compression”, the longitudinal residual stress first decreased and then increased slightly, the peak stress in the near seam area was 183 MPa, and the peak stress in the far seam area was 33.5 MPa.The transverse shrinkage deformation of T-joint was the largest, with the deformation peak value of 1.727 mm, which was mainly related to the transverse sharp contraction, the “pull” heat affected zone, and the base metal, when the molten pool metal was cooled and solidified. |
| Key words: double heat source cooperative welding T-joint temperature field stress field welding deformation |
