Other performances of green laser pointer are needed to be debugged

Other performances of green laser pointer are needed to be debugged
When the absolute value of the small defocus amount, the laser spot diameter and laser power density, faster expansion of solder bath, but the small diameter of the initial key-hole; the opposite case, the larger defocus amount, the initial the diameter of the Keyhole, but the molten pool expansion slows down, the solder joint size is not necessarily great. A certain laser power and welding speed, only the focus is within the best position to get maximum penetration and good weld shape. The impact of deep welding process parameters and the effect of heat conduction welding and deep penetration welding quality difference between the heat conduction welding and deep penetration the most basic difference is that the former pool surface and remain closed, while the latter bath is a laser beam to penetrate into holes. There are some specific and professional requirements towards green laser pointer .
Welding thermal conductivity of the system disturbance smaller, because the radiation of the laser beam does not penetrate the welded materials, so in the conduction welding process to weld difficult to be gas-invasive; deep penetration, the continuous closure of holes can lead to holes . The influence of the plasma in deep penetration welding process, high power density laser beam to the workpiece surface, the material is quickly melting evaporation, the formation of steam clouds above the workpiece. In the process of leaving the surface of the workpiece at high speed steam clouds located in the incident beam path by heating, under certain conditions will be quickly ionized plasma is produced. Plasma on the laser absorption, refraction and scattering. green laser pointer used for the star gazing can be the green laser pointer.
Therefore, in general the top of the molten pool of plasma weaken the laser energy to reach the workpiece. And influence the beam focusing effect on the welding. Usually a secondary side of the inflatable to get rid of or weaken the plasma. Used as an auxiliary gas such as Ar, He, N2 and CO2. Different auxiliary gas to suppress the ionization potential of the plasma effect of the gas, thermal conductivity and dissociation energy and so on. When the auxiliary gas flow rate less than the critical flow, the gas ionization potential to play a leading role. The highest ionization potentials of these four gases He, the corresponding order of He (24.5eV), Ar, (15.68eV] 2 (14.6eV) and N CO2 (13.8eV), it is felt that He inhibition of plasma best. The customer can choose the suitable green laser pointer according to the needs and tastes.