激光焊接中的等离子体与小孔行为分析

李斌; 赵泽洋; 王春明; 胡席远; 郭涟

激光焊接中的等离子体与小孔行为分析

1.
华中科技大学机械科学与工程学院, 武汉 430074;武汉华工激光工程有限责任公司, 武汉 430223
2.
华中科技大学材料科学与工程学院, 武汉 430074
3.
武汉华工激光工程有限责任公司, 武汉 430223

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- 收稿日期: 2014-09-16

Behaviors of plasma and keyhole in laser welding

1.
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;Wuhan Huagong Laser Engineering Co., Ltd., Wuhan 430223, China
2.
School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
3.
Wuhan Huagong Laser Engineering Co., Ltd., Wuhan 430223, China

摘要

摘要: 试验采用光、声信号检测设备,对1.8 mm镀锌钢板的CO₂激光焊接过程中的蓝紫光信号、红外辐射信号、可听声信号进行了高速采集,对比激光深熔焊与热传导焊过程中三路信号的联系与区别,分析研究了激光深熔焊过程的小孔与等离子体产生过程的瞬态行为.结果表明,等离子体与小孔并不总是同时产生,等离子体要先于小孔产生,热传导焊过程中也可能存在等离子体,在试验条件下,等离子体在激光作用于工件后3~4 ms产生,稳定的小孔在焊接后约14 ms后形成,并且激光焊接中产生等离子体的激光功率密度阈值要小于产生小孔的阈值.
- 激光焊接 /
- 小孔 /
- 等离子体
Abstract: Ultraviolet emission signals and infrared emission signals and audible sound signals were collected in CO₂ laser welding of 1.8 mm galvanized steel plate. The correlation and difference among three signals were compared between laser deep penetration welding and laser heat conduction welding. The transient behaviors of keyhole and plasma were also analyzed during laser penetration welding process. The results indicate that the keyhole and plasma are not always generated at the same time and the plasma is produced prior to keyhole. The plasma may appear in the heat conduction welding. Under the experimental conditions, the plasma forms after 3[KG-*5]-[KG-*3]4 ms of laser being irradiated on the samples, while the stable keyhole forms at about 14 ms after welding. It has been found that the power intensity used to produce the plasma is lower than that of the keyhole.
- laser welding /
- keyhole /
- plasma

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参考文献(9)

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激光焊接中的等离子体与小孔行为分析

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Behaviors of plasma and keyhole in laser welding

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