Investigation on the effects of shielding gas on porosity in fiber laser welding of T-joint steels

被引：26

作者：

Li, Kai ^{[1
]}

Lu, Fenggui ^{[1
]}

Cui, Haichao ^{[1
]}

Li, Xibin ^{[1
]}

Tang, Xinhua ^{[1
]}

Li, Zhuguo ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Key Lab Mat Laser Proc & Modificat, Shanghai 200030, Peoples R China

来源：

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY | 2015年 / 77卷 / 9-12期

基金：

中国国家自然科学基金;

关键词：

Fiber laser welding; T-joint structure; Shielding gas; Porosity; High-speed camera; STAINLESS-STEEL; PENETRATION;

D O I：

10.1007/s00170-014-6538-4

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Keyhole-induced porosity as one of the serious defects in deep-penetration laser welding, negatively affected the mechanical properties of welded structures. Keyhole laser welding is an effective method to fully penetrate the face and web plate for T-joint steel structures used in ship building and offshore platform. It is found that shielding gas parameters play an important role in laser welding process; different flow rates, blowing angle, and distance of shielding gas are considered to study the porosity number and distribution in order to make a systematic investigation on keyhole-induced porosity formation and its influencing factors. The result shows that appropriate shielding gas flow rate, blowing angel, and distance to molten pool could help to achieve less porosity for this T-joint. Also, a high-speed photography of 1,000 fps was applied to observe the plasma over the keyhole and fluid flow of molten pool to better understand the formation process of porosity.

引用

页码：1881 / 1888

页数：8

共 17 条

[1] Direct observation of keyhole behaviour during pulse modulated high-power Nd:YAG laser irradiation [J].