随着大功率YAG激光突破1kW和连续或高重复频率输出的平均功率，深熔焊接也可以实现。它的波长相对较短，金属的吸收率很高。焊接过程很少受到光致等离子体的干扰，具有良好的应用前景。随着[ 1 ]光纤激光器的发展，高功率光纤激光器、光纤激光制造成功，质量好，使用寿命长，设备免维护周期长，储备功率比CO2激光波长只有1 / 10甚至更高，电光转换效率高达30%，促进了激光焊接的应用发展。激光焊接的应用也涉及到航空航天、军工、造船、汽车制造、压力容器制造、开发和医疗等行业。
Laser welding uses the stimulated emission laser as the heat source to melt and cool the material and realize the bonding between atoms. According to the filling material which can be divided into laser welding, laser welding and laser welding (Ji Guanghan); according to the mirror structure can be divided into ordinary laser welding, laser scanning welding; welding penetration welding can be classified according to the heat conduction of laser welding and laser.
Laser welding, as a high quality, high precision, low deformation, high efficiency, high speed welding method, has been paid more and more attention. Pulsed solid laser spot welding and lap welding for small parts in the early stage. Keyhole effect deep penetration welding has been obtained in high power CO2 laser. Laser deep penetration welding technology has been rapidly developed and widely used in industrial machinery.
With the high power YAG laser breaking through 1kW and the average power of continuous or high repetition frequency output, deep penetration welding can also be realized. It has a relatively short wavelength and a high absorption rate of metals. The welding process is seldom interfered by photo induced plasma and has a good application prospect. With the development of  fiber laser, high power fiber laser, fiber laser manufacturing success, good quality, long service life, equipment maintenance free period is long, reserve power than the CO2 laser wavelength is only 1 / 10 or even higher, electro-optical conversion efficiency is up to 30%, to promote the application and development of laser welding. The application of laser welding also involves aviation, aerospace, military, shipbuilding, automobile manufacturing, pressure vessel manufacturing, development and medical treatment.
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