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党利,郑静静,马遥力,赵辉,李勇.基于数值模拟的挤压参数对AZ91镁合金管转角焊合室分流挤压焊合压力的影响规律研究[J].稀有金属材料与工程(英文),2021,50(8):2752~2759.[Dang Li,Zheng Jingjing,Ma Yaoli,Zhao Hui and Li Yong.Simulation Research on Effect of Extrusion Parameters on Welding Pressure During Porthole Extrusion Process of AZ91 Pipe Through Angle Welding Chamber Die[J].Rare Metal Materials and Engineering,2021,50(8):2752~2759.]
Simulation Research on Effect of Extrusion Parameters on Welding Pressure During Porthole Extrusion Process of AZ91 Pipe Through Angle Welding Chamber Die
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Received:July 10, 2020  
DOI:
Key words: AZ91 magnesium alloy  porthole extrusion  angle welding chamber  mean stress
Foundation item:河南省科技攻关项目,项目号182102210441
Author NameAffiliation
Dang Li,Zheng Jingjing,Ma Yaoli,Zhao Hui and Li Yong  
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Abstract:
      A novel porthole extrusion process combined with corner extrusion principle for AZ91 pipe was presented. This new extrusion process can not only extend the length of the welding chamber, but also increase the rigidity of the latch needle, thereby ensuring the dimensional accuracy of pipe. Meanwhile, this new extrusion method can increase the deform degree and improve the dynamic recrystallization of the pre-welded metal, which can improve the welding quality and pipe quality. Then, the metal flowing characteristic, distribution feature of effective strain and mean stress in the corner porthole chamber were revealed; the results show that the effective strain of the separated metal becomes larger after flowing through the corner of the welding chamber, which can promote the quality of the welding seam. And the mean stress in the welding chamber is larger than 240 MPa, which satisfies the welding pressure condition. The influence rules of extrusion speed, die angle and billet preheating temperature on the mean stress in the welding chamber were also discussed; the result shows that the higher extrusion speed and the higher preheating temperature of the billet can enhance the mean stress in the welding chamber, which can improve the welding quality. The larger die angle can lead to higher mean pressure.