研究论文

匙孔内光纤激光致喷发蒸汽对焊接过程的影响

  • 孔华 ,
  • 赵振家 ,
  • 邹江林 ,
  • 王紫 ,
  • 黄泽泓
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  • 北京工业大学, 高功率及超快激光先进制造实验室, 北京, 100124
孔华,硕士;主要研究方向为激光先进制造;Email:kongh@emails.bjut.edu.cn

收稿日期: 2022-05-30

  网络出版日期: 2024-02-04

基金资助

国家自然科学基金面上项目(51875007);北京市自然科学基金面上项目(3222004)

The influence of laser-induced plume in the keyhole on the welding process

  • KONG Hua ,
  • ZHAO Zhenjia ,
  • ZOU Jianglin ,
  • WANG Zi ,
  • HUANG Zehong
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  • High-power and Ultrafast Laser Manufacturing Lab, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

Received date: 2022-05-30

  Online published: 2024-02-04

摘要

光纤激光深熔焊接羽辉由匙孔内激光致蒸汽喷发所致,对焊接过程存在严重的负面影响. 文中通过改变匙孔内激光致蒸汽的喷发特征,研究羽辉对光纤激光深熔焊接过程的影响规律. 结果表明,随着焊接速度的提高,沿焊接方向的匙孔口长度逐渐增大,匙孔前壁的倾斜角则逐渐减小. 该现象导致孔内激光致喷发蒸汽的特征发生变化:底部摆动羽辉的喷发方向逐渐沿焊接反方向偏离激光束,狭长形羽辉的高度则逐渐降低直至消失;羽辉对焊接熔深的负面影响也逐渐减小直至消失,但飞溅数量逐渐增多,焊缝表面成形则逐渐恶化. 进一步分析表明,匙孔前壁激光致蒸汽的喷发方向变化是底部摆动羽辉的喷发方向和狭长形羽辉高度均发生改变的主要原因;提高焊接速度可降低羽辉对焊接过程的负面影响,但匙孔前壁激光致蒸汽对匙孔后壁的冲击作用将导致孔口沿焊接方向的长度变大、飞溅增多、焊缝表面成形质量变差.

本文引用格式

孔华 , 赵振家 , 邹江林 , 王紫 , 黄泽泓 . 匙孔内光纤激光致喷发蒸汽对焊接过程的影响[J]. 焊接学报, 2023 , 44(5) : 20 -26 . DOI: 10.12073/j.hjxb.20220530001

Abstract

The plume can be divided into two parts: the fluctuating portion that emerges from the keyhole, called the lower fluctuating plume, and the portion that resembles a focused laser beam, referred to as the narrow plume. The changes in the morphology of these two plume parts and their influence on the welding process were studied. The results show that with increasing welding speed, the eruption direction of the lower fluctuating plume gradually deviates from the laser beam in the opposite direction of welding. The height of the narrow and long plume gradually decreases until it disappears. The effect of plume glow on the depth/width of the melt gradually decreases until it disappears. The forming quality of the weld surface gradually deteriorates. Increasing the welding speed reduces the negative impact of the narrow and elongated plume on the depth/width of the melt. The impact of the lower fluctuating plume on the back wall of the keyhole causes the length of the orifice along the welding direction to become larger, increasing spatter and reducing the forming quality of the weld surface.

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