The elimination of pores in laser welds of AISI 304 plate using different shielding gases

被引：35

作者：

Sun, Junhao ^{[1
,2
]}

Nie, Pulin ^{[1
,2
]}

Feng, Kai ^{[1
,2
]}

Li, Zhuguo ^{[1
,2
]}

Guo, Baochao ^{[3
]}

Jiang, En ^{[3
]}

机构：

[1] Shanghai Jiao Tong Univ, Shanghai Key Lab Mat Laser Proc & Modificat, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[2] Collaborat Innovat Ctr Adv Ship & Deep Sea Explor, Shanghai 200240, Peoples R China

[3] Shanghai 1 Machine Tool Works Co Ltd, Shanghai 201308, Peoples R China

来源：

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2017年 / 248卷

关键词：

Laser welding; Stainless steel; Pores; Shielding gas; Thermodynamics and kinetics models; PREVENTION; POROSITY;

D O I：

10.1016/j.jmatprotec.2017.05.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A laser power of 10 kW was used to weld 304 stainless steel. Different shielding gases including Ar, N-2 and no gas were used. The porosity in the laser welds was examined. The metallic plume, liquid melt pool and laser keyhole were observed by a high-speed video camera. Bubbles were produced in all the laser welds. Many pores were retained in the 304L stainless steel laser welds made in Ar. Almost no pores were found in the laser welds made in N-2 or no shielding gas. The dissolution of N-2 bubbles in the liquid melt pool led to the elimination of the pores in the 304L laser welds. The retention time of liquid melt pool was 1.1 s at a laser power of 10 kW and a welding speed of 0.8 m/min. It took 30 us to absorb all the N-2 bubbles in the liquid melt pool. The increase of the nitrogen content in weld metal was 3.4 x 10(-5) wt.%.

引用

页码：56 / 63

页数：8

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