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Interface formation and bonding mechanisms of laser transmission welded composite structure of PET on austenitic steel via beam oscillation

机译：奥氏体钢上PET透射激光焊接复合结构的束流界面形成及结合机理

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摘要

Laser lap welding of composite structure of amorphous polyethylene terephthalate (PET) to 304 steel was carried out via beam oscillation. The effects of laser power (P), oscillating radius (r) and frequency (f) on weld macroscopic morphologies, tensile properties and bonding mechanisms were investigated. The defect of thermal degradation could be eliminated, but the lack of fusion occurred with the r approaching 3 mm. The welds were homogeneous with the pores discretely or network distributed when the r was between 2 and 2.5 mm. The bonding strength increased from the center to the edge with more retained base steel on the PET surface. The welding parameters were optimized as the P of 300 W, the r of 2 mm, the f of 300 Hz under given welding speed of 50 cm/min and defocused distance of 20 mm. The shear force was 26% higher than the sample without beam oscillation, because of the C-M and C-O formed by the reactions of the PET with the steel and the air. The weld homogeneity was illustrated on the basis of the proposed energy distribution model. The formation and inhibition mechanisms of the thermal degradation and lack of fusion were then discussed.
机译：通过束振荡将无定形聚对苯二甲酸乙二酯（PET）的复合结构与304钢进行激光搭接焊接。研究了激光功率（P），振荡半径（r）和频率（f）对焊缝宏观形态，拉伸性能和结合机理的影响。可以消除热降解的缺陷，但是当r接近3 mm时，就不会发生熔化现象。当r在2和2.5 mm之间时，焊缝是均匀的，孔是离散的或网状分布。粘结强度从中心到边缘增加，并且在PET表面保留了更多的基础钢。在给定的焊接速度为50 cm / min和散焦距离为20 mm的情况下，将焊接参数优化为P为300 W，r为2 mm，f为300 Hz。由于PET与钢和空气的反应形成了C-M和C-O，因此剪切力比没有梁振动的样品高26％。在提出的能量分布模型的基础上说明了焊接均匀性。然后讨论了热降解和缺乏熔合的形成和抑制机理。

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  • 来源
    《Composite Structures》 |2020年第3期|111752.1-111752.9|共9页
  • 作者

  • 作者单位

    Wuhan Univ Sci & Technol State Key Lab Refractories & Met Wuhan 430081 Peoples R China;

    Huazhong Univ Sci & Technol WNLO Wuhan 430074 Peoples R China;

    Harbin Engn Univ Natl Key Lab Sci & Technol Underwater Vehicle Harbin 150001 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laser welding; Plastic; Austenitic steel; Surface morphology; Interface bonding;

    机译：激光焊接;塑料;奥氏体钢;表面形态接口粘接;

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