Laser welding machine welding process produced three main cracks: knot cracks, liquefied cracks and reheat cracks. Crystalline cracks are related to the compositional heterogeneity of the weld macroscopic region. The central area of the weld is the latest part of the liquid phase crystallization, where the columnar crystals on both sides of the weld intersect at the same time, and a large number of low melting impurities are also accumulated here to form a centerline segregation, thereby reducing the bonding strength. Under certain mechanical conditions, the crack is produced in this area. Know the cause of the crack, we should pay attention to the life of high power laser welding machine operation, try to avoid the operating causes of welding defects.

The choice of laser light source, may be due to the laser light source with wavelength selectivity and high spectral brightness characteristics, can be seen in the human eye to see more than 90% of the natural color gamut coverage, to achieve the perfect color reproduction. At the same time, the laser light source has a high brightness and long service life, greatly reducing the maintenance costs of the latter. At the same time, the laser projector is almost instantaneous start, instantly reach the work brightness, so the red laser pointer light projector are seen as a fast switch machine. And the traditional light bulb need to work for a period of time to achieve a stable working temperature, and shut down the same time to heat, switch machines are more time-consuming.

Laser light source can be said that the most attention in recent years, the projection light source. In the past two years, the laser light source has gradually moved from the professional field to the daily life field. On the current overall situation, whether it is the traditional business and education market, or the limelight Sheng project and home market, laser light source there are great potential. Traditional light source of high brightness, up to tens of thousands of lumens. There is a lot of room to adjust in terms of color and make it adaptable. The most important thing is the low price, largely reduced the cost.

Throughout the market, we can find that different forms of light source to achieve the development in different areas, for example, the traditional light bulbs currently applicable to a wide range of the market is still a large proportion of commercial and home areas occupy a small share of the green laser pointer light source can So that ultra-high brightness, for digital cinema and other fields of expertise and engineering, and LED light source is mainly used in entertainment, mini-portable projection equipment and other fields. Throughout the projector market, we can find that its light source is divided into three categories, namely, light bulbs, LED light source and laser pointer light source, then what are the differences between the three types of light source?

The development of laser technology is evolving from the early gas lasers (helium-neon lasers), high-power carbon dioxide lasers, excimer lasers, tunable dye lasers, semiconductor lasers, nanosecond and picosecond pulsed lasers to recent fiber lasers and femtosecond (Laser beam quality, pattern diversity, pulse width, peak power, average power, spatial coherence, temporal coherence, etc.) are increasing in all aspects of pulse blue laser pointer and laser family members. The application of laser technology is becoming more and more extensive, has become an indispensable tool for scientific research, defense, military, lighting, optical fiber communication, information sensing, storage and display, industrial production, biomedicine, environmental testing and so on. The earth is driving these applications to new levels and steps.

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