连续脉冲GTAW不同熔透状态熔池振荡频率特征及分析

发布时间：2018-06-28 04:14

  本文选题：熔池振荡 + 熔透状态　； 参考：《机械工程学报》2016年20期

【摘要】：熔池振荡频率与熔池尺寸具有直接物理对应关系,但常规弧压、弧光方法很难实现连续焊接振荡频率提取。提出一种激光视觉测量方法用于连续焊接振荡频率检测。对连续焊接条件下部分、临界及全熔透状态下的熔池振荡激光条纹进行采集,通过图像处理算法提取不同熔透状态下的频率特征,并从激光条纹变化形态、熔池表面振荡和液态金属内部流动对不同频率特征进行分析。结果表明,激光视觉法能够精确检测熔池表面金属轴向及横向的流动;在部分和全熔透状态下熔池表面及内部金属以单一模式进行振荡,存在单一特征频率;在临界熔透状态下由于熔池约束条件的变化,使其表面振荡及内部金属振荡具有部分和全熔透的振荡特征,表现出两种特征频率;不同熔透状态的振荡频率特征可为精确检测不同熔透状态提供依据。
[Abstract]:There is a direct physical correspondence between the oscillation frequency of molten pool and the size of weld pool, but it is difficult to extract the frequency of continuous welding oscillation by conventional arc voltage and arc light method. A laser vision measurement method for continuous welding oscillation frequency detection is proposed. The oscillatory laser fringes of molten pool under continuous welding condition, critical and fully permeable state were collected, and the frequency characteristics of different penetration states were extracted by image processing algorithm, and the pattern of laser stripes was changed from the laser stripes. The characteristics of different frequencies were analyzed by oscillating on the surface of molten pool and internal flow of liquid metal. The results show that the laser vision method can accurately detect the axial and lateral flow of metal on the molten pool surface and oscillate in a single mode with a single characteristic frequency on the surface and inside of the molten pool in partial and fully permeable state. Under the critical penetration condition, the surface oscillation and the internal metal oscillation have partial and full penetration oscillation characteristics due to the variation of the confinement conditions of the molten pool, showing two characteristic frequencies. The oscillatory frequency characteristics of different penetration states can provide basis for accurate detection of different penetration states.
【作者单位】： 兰州理工大学省部共建有色金属先进材料加工与再利用国家重点实验室;
【基金】：973计划前期研究专项(2014CB660810) 国家自然科学基金(51305189) 甘肃省自然科学基金(145RJZA119) 兰州理工大学红柳杰出人才培养计划(J201201) 省部共建有色金属先进加工与再利用国家重点实验室开放基金(SKLAB02015008)资助项目
【分类号】：TG444.74
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本文编号：2076686