异厚板激光拼焊接头动态拉伸性能数值仿真方法研究

郑帮智; 田晓琳; 王泽龙; 唐新新

doi:10.7513/j.issn.1004-7638.2021.05.010

异厚板激光拼焊接头动态拉伸性能数值仿真方法研究

doi: 10.7513/j.issn.1004-7638.2021.05.010

郑帮智^{1, 2,},
田晓琳^{1, 2},
王泽龙^{1, 2},
唐新新^{1, 2}

1.
成都先进金属材料产业技术研究院股份有限公司, 四川成都 610300
2.
钒钛资源综合利用国家重点实验室, 四川攀枝花 617000

详细信息

作者简介:
郑帮智（1988—），男，硕士，工程师，主要研究方向：材料动态性能测试与仿真，E-mail：zbz315@126.com。

中图分类号: TF76,TG456.7
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出版历程
- 收稿日期: 2021-01-06
- 刊出日期: 2021-10-30

Research on numerical simulation method for dynamic tensile performance of laser tailor-welded joints of different thickness

Zheng Bangzhi^{1, 2
,},
Tian Xiaolin^{1, 2},
Wang Zelong^{1, 2},
Tang Xinxin^{1, 2}

1.
Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Chengdu 610300, Sichuan, China
2.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China

摘要

摘要: 研究了异厚板HC340LA和HC260LA低合金高强钢激光拼焊工艺，对焊接接头进行了X射线探伤、静态拉伸、金相组织和显微硬度检测与分析。结果表明，异厚低合金高强钢通过激光拼焊工艺可以得到成形良好的焊缝，焊缝组织以柱状马氏体为主。焊缝经探伤无明显可见气孔、夹渣等缺陷，拉伸试样断裂位置位于薄板母材一侧上，且焊缝融合区硬度明显高于母材。针对激光拼焊接头进行了动态拉伸试验和数值仿真分析，研究了共节点模型与试验的差异性、区域效应和厚度效应对应力应变的影响规律。研究表明，采用共节点数值模型进行动态拉伸仿真，其应变值远大于试验测得的应变值。焊缝相关联的母材区域可直接调控应力应变的分布情况，可通过区域效应调控应变的大小，厚度效应调控应力的大小。
- 异厚板 /
- 激光拼焊 /
- 动态拉伸 /
- 数值模拟
Abstract: The laser tailored welding process of HC340LA and HC260LA low-alloy high-strength steels with different thicknesses was studied, and the welded joints were tested and analyzed by X-ray flaw detection, static tensile, metallographic structure and microhardness. The results show that the low-alloy high-strength steel with different thickness can get well-formed welds through the laser tailor welding process, and the weld structure is mainly columnar martensite. After flaw detection, the welds showed no obvious defects such as pores and slag inclusions. The fracture position of the tensile specimen was on the side of the base material of the thin blank, and the hardness of the weld fusion zone was significantly higher than that of the base material. For laser tailor-welded joints, dynamic tensile test and numerical simulation analysis are carried out, and the difference between common node model and test, regional effect and thickness effect on stress and strain are studied. The research shows that the strain values of the dynamic tensile simulation using the common node numerical model are much higher than those measured in the experiment. The area of the base metal associated with the weld can directly affect the distribution of stress and strain, the strain can be regulated by the regional effect, and the stress can be regulated by the thickness effect.
- different thickness blanks /
- laser tailor welding /
- dynamic tensile /
- numerical simulation

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图 1 焊接接头的探伤、拉伸、硬度分布和显微组织

Figure 1. (a) X-ray inspection, (b) tensile, (c) microhardness distribution and (d-g) microstructures of the welded joint

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图 2 动态拉伸数值模型

Figure 2. Numerical models for dynamic tensile test

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图 3 试验测试的应变分布

Figure 3. Experimental strain distribution

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图 4 模型中试样的区域划分

Figure 4. Partition of the sample in numerical simulation model

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图 5 试样的应力应变曲线

Figure 5. Stress-strain curves of the sample

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图 6 共节点模型的应力应变曲线

Figure 6. Stress-strain curves of the common node model

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图 7 区域效应对应变的影响

Figure 7. The effect of the area size on the strain

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图 8 厚度效应对应力的影响

Figure 8. The effect of the thickness on the stress

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图 9 激光拼焊板成形试验

Figure 9. The forming test of laser tailor-welded blanks

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图 10 塑性应变云图的对比

Figure 10. Comparison of the plastic strain cloud diagrams of various models

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参考文献(8)

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