The commission process of green laser pointer is complicated

The commission process of green laser pointer is complicated
The laser power density required to select the characteristics of the material itself and welding technology requirements. Under normal circumstances, the thin plate (plate thickness is 0.01-0.10mm) welding, the laser power density range for the Fm of <F <Fc, in the slab (thickness greater than 0.50mm) welding, the laser power density range Fm of < F <Fv6. The same time, the size of the laser power density has a considerable impact on the penetration and welding speed. Figure 2 - 2 laser thermal conductivity welding stainless steel, power and welding speed, the diagram of the melting depth of 2-2 1, 2 and 3, respectively, for 1.0,3.0,10.0 mm / s welding speed of melting depth curves. 7 can be seen in the laser power, welding speed, the heat input is decreased, reduce weld penetration.It can be seen that the laser pulse Start role of high reflectivity is quite high; when the surface temperature rose to the melting point, the reflectivity of the rapid decline; surface in a molten state, the reflection rate stable at a value; when the surface temperature continues to rise to the boiling point reflectance, and again declined. green laser pointer can be used for the star gazing. Defocus amount on the quality of welding laser welding usually requires a certain degree of defocus amount, because of the high power density of the laser focus at the spot center, easily evaporate into the hole.
This paper discusses the progress of the ultra high strength steel (UHS) plate welding process, welding solid-state lasers for optical fiber transmission, to determine the weld strong warm formability. Using three different solid-state lasers of the optical fiber transmission thickness of 0.8 to 15mm, the tensile strength of 600 to 1 550 MPa the same material and different material combinations dual phase steels (DP), transformation induced plasticity steel (OF TRIP), Usibor steel and boron steel spontaneous, carbon dioxide laser welding test, lap duplex to get penetration butt welds. The fusion zone and heat affected zone, hardening and softening behavior, and also analyzed the impact of the laser process parameters on the welding speed, weld morphology and joint performance. The laser equipment used in this paper, laser welding test using three different optical fiber transmission solid-state lasers: 4kW continuous-wave Nd: YAG laser, the Yb fiber laser 5kW and 7kW Yb fiber laser. Among them, the use of Nd: YAG laser for TrumpfHL4006D 4kW lamp-pumped lasers, laser diameter ψ0.6. However, the maximum welding speed, increasing the laser power using a smaller laser spot is more effective. Figure 8 shows a typical cross-section of the lap weld the different steel plate weld cross section of a combination of different materials is given in Figure 9.