修复速度对脉冲冷焊修复层温度场的影响
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摘要
脉冲冷焊修复速度是决定修复层质量的关键因素。为了确定不同修复速度对脉冲冷焊修复层温度场的影响,在45钢试样表面加工一尺寸为50mm×6mm×1mm的长方体缺口,对缺口进行脉冲冷焊修复。首先建立了三维有限元分析模型,并以体载荷形式,给修复过程中不断激活的单元体施加生热率的方式模拟出在不同修复速度下的温度场动态分布。探讨了修复层温度场的变化特征。然后利用DZMH-6脉冲冷焊机设备、热电偶和XSR30无纸记录仪确定了真实温度场分布规律。研究表明:在2.3mm/s时的温度上升速度和温度峰值比在2.5mm/s时大,数值模拟的温度场结果与实际测量结果吻合性较高。采用生死单元技术和体生热率热源方式可有效预测真实脉冲冷焊修复过程温度场。
Pulse cold welding repair rate is a key factor in determining the quality of repair layer. In order to determine the effect of different repair rates on the temperature field of the pulse cold welding layer,a 45 steel specimen was machined to a rectangular parallelepiped with a size of 50 mm × 6 mm × 1 mm. Firstly,a three-dimensional finite element analysis model was established,and the dynamic distribution of the temperature field at different repairing rates was simulated by the method of body generating load.The change of the temperature field feature of the repairing layer was discussed by the method of applying the heat generation rate to the unit which was constantly activated during the repair. And then through the DZMH-6 pulse cold welding equipment,the use of thermocouple and XSR30 paperless recorder to determine the real temperature field distribution. Research shows that: The temperature rise rate and the temperature peak of 2. 3 mm/s are larger than 2. 5 mm/s,and the temperature field results of numerical simulation are in good agreement with the actual measurement results. The use of life and death unit technology and body heat rate heat source can effectively predict the real pulse cold welding process temperature field.
Pulse cold welding repair rate is a key factor in determining the quality of repair layer. In order to determine the effect of different repair rates on the temperature field of the pulse cold welding layer,a 45 steel specimen was machined to a rectangular parallelepiped with a size of 50 mm × 6 mm × 1 mm. Firstly,a three-dimensional finite element analysis model was established,and the dynamic distribution of the temperature field at different repairing rates was simulated by the method of body generating load.The change of the temperature field feature of the repairing layer was discussed by the method of applying the heat generation rate to the unit which was constantly activated during the repair. And then through the DZMH-6 pulse cold welding equipment,the use of thermocouple and XSR30 paperless recorder to determine the real temperature field distribution. Research shows that: The temperature rise rate and the temperature peak of 2. 3 mm/s are larger than 2. 5 mm/s,and the temperature field results of numerical simulation are in good agreement with the actual measurement results. The use of life and death unit technology and body heat rate heat source can effectively predict the real pulse cold welding process temperature field.
引文
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[3]KONG F,KOVACEVIC R.Measurement of surface residual stresses and testing mechanical properties of high-strength steel butt joints obtained by hybrid laser/gas metal arc welding[J].Journal of Strain Analysis for Engineering Design,2013,48(7):437-445.
[4]明洪亮,张志明,王俭秋,等.国产核电安全端异种金属焊接件的微观结构及局部性能研究[J].金属学报,2017(1):57-69.
[5]代雪佳,凌泽民,刘明翔,等.45钢焊接接头组织与性能分析[J].热加工工艺,2014(3):184-185,189.
[6]李亚娟,李午申.X80管线钢环焊缝接头残余应力的数值模拟[J].焊接学报,2010,31(6):97-104.
[7]向杰,乌日开西·艾依提,张连重,等.快速再制造成形温度场模拟中的热源模型对比研究[J].现代制造工程,2013(5).
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