随焊加载冷源或位移控制载荷的无应力焊接方法
Principle of stress-free welding with cold source or displacement-controled load
查看参考文献17篇
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文摘
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应用一维杆模型论证了随焊加载冷源或位移控制载荷实现无应力焊接的原理.应用数值模拟探讨了其实现方式,对7种加载方案下杆件中心点应力、塑性应变等物理量的时程分布进行了数值模拟对比研究,认为任意时刻外加位移控制载荷产生的机械应变和热输入满足一定条件时焊后残余应力为零.随焊降低残余应力的工艺在焊件局部区域产生的变形速率与该局部区域的热膨胀或收缩变形量速率大小相同时,降低残余应力的效果达到最优.应用模型导出的原理对焊前预拉伸、焊前温差拉伸、动态温差拉伸、低应力无变形焊接(LSND)等工艺的原理和参数设置依据进行了讨论.结果表明,使焊件内部在冷却时产生足够大的拉伸塑性应变,是降低焊接残余应力的有效途径. |
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其他语种文摘
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The principle of the stress-free welding with cold source or displacement-controled load was demonstrated by using one-dimensional rod model. The numerical simulation experiment was used to discuss the way to realize the welding method. The time history distributions of physical quantities such as stress and plastic strain at the center point of the bar under seven loading schemes were numerically simulated and compared in detail. It was considered that the welding residual stress would be zero when the mechanical strain generated by the external displacement-controled load and thermal input at any time satisfied certain conditions. The best residual stress reducing effect was obtained when the deformation rate produced by the process of reducing residual stress with welding is the same as that of thermal expansion or thermal shrinkage in the local area. Based on the principle derived from this model, the principles and parameter setting basis of process, such as pre-stretching, pre-welding thermal tensioning, dynamic thermal tensioning and low stress and nondeformation (LSND), were discussed. It is an effective way to reduce welding residual stress by generating a large enough tensile plastic strain when the weldment is cooled. |
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来源
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焊接学报
,2020,41(1):91-96 【核心库】
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DOI
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10.12073/j.hjxb.20190829002
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关键词
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焊接结构
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残余应力
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随焊加载冷源
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位移控制载荷
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无应力焊接
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地址
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1.
辽宁石油化工大学, 抚顺, 113001
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中国科学院金属研究所, 中科院核用材料与安全评价重点实验室, 沈阳, 110016
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中国石油天然气第八建设有限公司, 抚顺, 113006
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-360X |
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学科
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金属学与金属工艺 |
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基金
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辽宁省教育厅基本科研项目
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文献收藏号
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CSCD:6721849
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