期刊论文

中文

机械工程学报

0577-6686

2022

58

10

103-111

10.3901/JME.2022.10.103

51705287:国家自然科学基金 51705388:国家自然科学基金 51975270:国家自然科学基金 D20211203:湖北省教育厅科研计划项目 2021SSPY040:三峡大学硕士论文培优基金资助项目

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焊接速度对电弧增材成形过程中传热传质以及焊道成形有重要影响,为探究其影响机理,建立TIG电弧增材成形过程的三维瞬态数值模型,采用VOF方法追踪熔池自由界面,研究不同焊接速度下单道熔积成形过程中的传热及熔池流态,并分析焊接速度对单道焊道形貌的影响。数值模拟结果表明,随着焊接速度减小,熔池的热积累增强,体积增大,熔池表面峰值温度提高,弧坑深度也加深;同时,在电磁力和熔池表面力的共同作用下,熔池表面流速峰值随焊接速度减小而减小,熔池内部流速增大,对流更充分。此外,随着焊接速度减小,成形焊道的宽度和高度均有不同程度的增加。相同条件下的试验与数值模拟的焊道轮廓对比验证了数值模拟...

The travel speed has important effects on heat and mass transfer as well as the weld bead forming in wire arc additive manufacturing (WAAM) process. In order to study the mechanism of these effects, a three-dimensional transient numerical model is developed, and the VOF method is employed to trace the free interface of the molten pool. The effects of travel speed on the heat transfer, molten pool flow and the single-pass weld bead morphology are discussed. Numerical simulation results show that with the reduction of travel speed, the heat accum...