Finite Element Analysis of Bottom Welds of High Strength Steel CO<sub>2</sub> Welding

Xin LIU; Zexin JIANG; Bo LIU; Jinjun MA

doi:10.7512/j.issn.1001-2303.2022.07.12

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Finite Element Analysis of Bottom Welds of High Strength Steel CO₂ Welding
Vol. 52, Issue 7, Pages: 84-92(2022)
DOI： 10.7512/j.issn.1001-2303.2022.07.12

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刘鑫，江泽新，刘博，等.高强钢CO₂焊打底层焊缝有限元分析［J］.电焊机，2022，52（7）：84-92.

LIU Xin, JIANG Zexin, LIU Bo, et al.Finite Element Analysis of Bottom Welds of High Strength Steel CO₂ Welding[J].Electric Welding Machine, 2022, 52(7): 84-92.
刘鑫，江泽新，刘博，等.高强钢CO₂焊打底层焊缝有限元分析［J］.电焊机，2022，52（7）：84-92. DOI： 10.7512/j.issn.1001-2303.2022.07.12.

LIU Xin, JIANG Zexin, LIU Bo, et al.Finite Element Analysis of Bottom Welds of High Strength Steel CO₂ Welding[J].Electric Welding Machine, 2022, 52(7): 84-92. DOI： 10.7512/j.issn.1001-2303.2022.07.12.

摘要

针对10 mm厚高强钢AH36平对接焊缝在相同热输入量、不同焊接热功率条件下的CO,2,焊匹配陶瓷衬垫打底层焊接进行了有限元分析试验，探究焊接过程中的温度场、残余应力、焊接变形的变化情况，分析打底裂纹产生的原因。通过分析可知：在打底层焊接时，熔池金属冷却收缩过程中，产生的残余应力数值在板材屈服强度和抗拉强度之间，发生板材不可逆的焊接变形，并有产生打底裂纹的不确定性；焊接热功率大，熔池温度高，冷却速度快，焊缝应力集中区增大；焊接卡码的装配限制了焊缝区的变形量，焊缝与卡码垂直位置的应力集中区进一步增大，打底层焊缝极易产生热裂纹。

Abstract

In this paper, the finite element analysis test of CO,2, welding matching ceramic backing bottom layer welding of 10 mm thick high strength steel AH36 flat butt weld under the same heat input and different welding heat power conditions was carried out to explore the temperature field, Changes in residual stress and welding deformation, and analyze the causes of bottoming cracks. It can be seen from the analysis that during the bottom welding, the residual stress value generated during the cooling and shrinkage of the molten pool metal is between the yield strength and the tensile strength of the plate, and the irreversible welding deformation of the plate occurs, and there is uncertainty about the occurrence of bottom cracks. The welding heat power is large, the temperature of the molten pool is high, the cooling rate is fast, and the stress concentration area of the weld increases; Further increase, the underlying weld is prone to hot cracks.

关键词

打底焊温度场残余应力焊接变形

Keywords

backing weldtemperature fieldresidual stresswelding deformation

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Finite Element Analysis of Bottom Welds of High Strength Steel CO2 Welding

DOI： 10.7512/j.issn.1001-2303.2022.07.12

摘要

Abstract

关键词

Keywords

references

Finite Element Analysis of Bottom Welds of High Strength Steel CO₂ Welding