The different ways according to the output of the laser beam

The different ways according to the output of the laser beam, the laser welding can be divided into a pulsed laser welding and continuous laser welding. Laser welding, the weld formation characteristics, but also can be laser welded into the thermal conductivity of solder and deep penetration. The former use of low laser power pool a long time, and the melt depth used for the welding of small parts; which uses the laser power density, speed of the laser radiation zone metal melting, metal melting is accompanied by a strong vaporization able to obtain the penetration depth larger weld, the weld depth and width is relatively large, up to 12:1.Figure 3-4 shows the evolution of the melting process. What other difference do red laser beam and green laser beam of green laser pointer have besides the color?
Laser welding, laser spot to the material "into the heat (the laser spot diameter is less than l The mm,), the material to heat up quickly and deeper below the surface of materials within a very short time, reached a high temperature. Weldment penetration depth can be controlled by the laser power density. The penetration depth can be controlled by the laser power density. Experience has shown that the can get reasonable focused laser beam of 1 kW, the speed of lm / min welding steel melting the deep weld of 1.5 mm. Laser welding input heat was significantly lower than the electric arc welding and gas welding, can be nearly perpendicular to the deep and narrow weld and narrow heat-affected zone, weldments small deformation. In some other occasions, some other factors might influence the control range of green laser pointer more or less.
Welding of steel plate, when the power density l04W/mm2 when the welding speed can be achieved per minute, tens of meters. The high power density, the multi-layer steel sheet of welding. The smaller the diameter of the laser beam spot can be accurately aligned on the weldment showed good anti-fatigue properties and high tensile strength of solder joints, due to the laser welding of welded joints is not serious stress concentration. The laser beam power density is less than 105W/cm2, laser metal surface heated to melting point and boiling point. Welding, the metal surface to absorb the laser energy into heat, the metal surface temperature of melting, heat transfer by thermal conduction to the metal, so that the melted zone gradually expanded and solidified to form the solder joints or welds , the penetration depth contour approximately hemispherical, this welding mechanism called the heat transfer welding. The control range of green laser pointer will be the farthest when the emitter points directly to the receiver.