In situ observation of dynamics of keyhole and molten pool in laser welding for development of spatter suppression

被引：3

作者：

Arita, Tomoki ^{[1
]}

Sato, Yuji ^{[2
]}

Kurita, Yoshiaki ^{[3
]}

Mizutani, Masami ^{[2
]}

Nakano, Hitoshi ^{[1
]}

Tsukamoto, Masahiro ^{[2
]}

机构：

[1] Kindai Univ, Grad Sch Sci & Engn, 3-4-1 Kowakae, Higashiosaka, Osaka 5778502, Japan

[2] Osaka Univ, Joining & Welding Res Inst, 11-1 Mihogaoka, Osaka, Ibaraki 5670047, Japan

[3] Osaka Univ, Grad Sch Engn, 1-1 Yamadaoka, Suita, Osaka 5650871, Japan

来源：

JOURNAL OF LASER APPLICATIONS | 2022年 / 34卷 / 03期

关键词：

laser welding in vacuum; spatter; keyhole; molten pool; disk laser; two-color pyrometer; PENETRATION; VACUUM;

D O I：

10.2351/7.0000744

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A real-time observation system for a longitudinal section of molten pool and temperature distribution was developed directly in real time by a combined system with the glass transmission method and two-color temperature analysis to clarify the mechanism of spatter generation during laser welding. A stainless-steel-type 304 (SS304) was employed in this study because of its application in many industries. The SS304 was set in a vacuum chamber and then a disk laser with an output power of 10 kW was irradiated and scanned on it to form a weld bead. At the same time, the behavior of the molten pool and keyhole was captured with the real-time temperature observation system and an x-ray transmission system, respectively. As a result, the temperature of the longitudinal section of the molten pool formed by laser irradiation under atmospheric pressure was about 1500 & DEG;C; however, at 10 Pa, it reached about 1700 & DEG;C, indicating that the temperature increases with a decrease in the ambient pressure. Furthermore, the fluctuation in the longitudinal sectional area of the keyhole and molten pool was evaluated. It was found that the average fluctuation in the longitudinal sectional area of the molten pool was 1.7% at 10 Pa and that of the molten pool was 18.8% under atmospheric pressure.

引用

页数：7

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