Prevention of porosity by oxygen addition in fibre laser and fibre laser-GMA hybrid welding

被引：14
作者：
Zhao, L. [1 ]
Tsukamoto, S. [1 ]
Arakane, G. [1 ]
Sugino, T. [2 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
[2] IHI Corp, Isogo Ku, Yokohama, Kanagawa 2358501, Japan
来源：
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2014年 / 19卷 / 02期
关键词：
Fibre laser welding; Hybrid welding; Porosity; Power modulation; Oxygen; Keyhole stability; Carbon monoxide; STAINLESS-STEEL; KEYHOLE; POOL;
D O I：
10.1179/1362171813Y.0000000160
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Prevention of porosity in partial penetration fibre laser and fibre laser-gas metal arc hybrid welding is investigated. It is found that modulation of laser power prevents porosity formation in fibre laser welding, but that this method is not effective in hybrid welding. However, the addition of a small amount of oxygen to the molten pool can prevent porosity formation in both fibre laser and hybrid welding. This is attributed to stabilisation of the keyhole. During welding, oxygen reacts with dissolved carbon to form carbon monoxide (CO) in the keyhole. The CO partial pressure in the keyhole prevents the intense interaction between laser beam and molten metal, thus stabilising the keyhole. The role of CO formation is confirmed by the enhancement of porosity suppression with increased carbon content of the base metal.
引用
收藏
页码：91 / 97
页数：7
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