激光焊接技术详解-精品(Lasers Welding)

可见光的波长在0.4-0.7微米之间。Visible from 0.4-0.7
micron wavelength
波长小于0.4微米是紫外线和X光Below 0.4 – ultraviolet
to x-rays
波长大于700nm的光为红外线和微波。
Above 0.7 – infra-red to microwaves
well as CW 可以被用于焊接和切割Can be used for welding and cutting
脉冲YAG激光（焊接）
Pulsed YAG Lasers (Welding)
闪光灯（光泵）Flash Lamp (Optical Pump)
颜色和光的波长是相关联的。
Color is associated with particular wavelength
黑色和白色代表着什么？
What is the meaning of black or white color?
黑色表面吸收了YAG光，而白色在反射了大部 分光。
Black surface will absorb YAG light while white will reflect most of it
我们为什么需要激光？
Why do we need Lasers?
材料加工需要吸收很强的光。
Absorption for materials processing requires very intense light
高强度的光可以通过激光聚焦成光束获得。
Intensity can be generated by focusing a beam of laser light
激光的种类
Types of Lasers
激光能量传输 Laser Power Delivery
连续波 Continuous Wave (CW) 脉冲 Pulsed Q-开关 Q-switched
激光频率 Laser Frequencies
基频和倍频 Fundamental and multiples
连续光纤激光
Continuous Wave Fiber Lasers
激光二极管光Laser Diode Light
光纤Fiber
激光二极管光 Laser Diode Light
激光在光纤中产生Laser light is created in the fiber 可在连续波和脉冲波中使用Can be used in pulsed mode as
Light and Lasers
激光Laser t
单频的（单波长）
Monochromatic (single wavelength)
校准的（平行光）
Collimated (parallel)
很多波长
Many wavelengths
不平行
Not parallel
激光焊接，W.W.Duley Laser Welding, W.W. Duley
激光加工，W.M.Steen Laser Materials Processing, W. M. Steen AWS 焊接手册，1-4 AWS Welding Handbooks, 1-4 激光加工手册-美国激光协会出版
Handbook of Laser Materials Processing
Published by the Laser Institute of America
公开的相关文献 Published literature
请记住…..
Remember…..
学习需要积极的参与 Learning requires active participation
Light and Lasers
激光 Laser Light
普通光Ordinary Light
激光的聚焦
Focusing of Lasers
激光Laser Light 普通光 Ordinary Light
单频（单波长）和校准（平行）的光可以聚焦 成很小的焦点
Monochromatic (single wavelength) and Collimated (parallel) light can be focused to a very small spot
Gamma
Visible
x-ray UV
IR
Microwave TV
Radio
0.001 0.01
µm
µm
0.4 0.7 µm µm
1 µm
YAG
光的吸收和颜色
Absorption and Color
物体的颜色来源于它反射的光的波长
Color of an object (wavelength that it reflects)
激光焊接技术 Lasers Welding
激光 LASER
受激辐射式光频放大器的英文第一个字母 的缩写
Light Amplification by Stimulation of Emitted Radiation
参考资料 References
激光的工业应用-J.F.Ready Industrial Applications of Lasers, J. F. Ready
不耻下问 Feel free to ask questions
无所顾及地提出个人不同见解 Do not hesitate to present different viewpoints
光 Light
光是一种电磁辐射 Light is electro-magnetic radiation
我们听不到.Waves that you cannot hear
普通光不能聚焦成很高的能量密度（或足够小 的点）
Ordinary light does not focus down to a high enough power density (or small enough spot size)
手持放大镜可以把太阳光聚焦让纸燃烧但是不能把 金属融化
Hand-held lens can focus sunlight to set fire to paper but not enough to melt metal