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Laser welding the welding process several effects. Laser welding plasma welding process. Plasma formation in conditions of high power density laser processing and will appear in the plasma. Plasma generation material atoms or the division of energy excitation ionization, any substance in the receiving outside energy and temperature, the atoms or molecules by the energy (light, heat, electric field, etc.) excitation will produce ionization, which formed by the free movement of electrons with positively charged ions and neutral atoms in plasma. Plasma is often referred to as the fourth state of matter at the macro level to maintain a neutral state. Laser welding, the premise of the formation of plasma is heated to a temperature gasification.  green laser pointer can be used for the city environment.
Metal by the laser heating gasification in the bath above the formation of high temperature metal vapor. The free electrons in the metal vapor. Free electrons in the laser irradiation area by the inverse bremsstrahlung radiation absorbed energy is accelerated until it has enough energy to collisions, ionization of metal vapor and surrounding gas, the electron density and thus increase the avalanche. This process can be approximated by the classic model of microwave heating and plasma is produced to describe. . Power of 10 W / cm, the average electron energy is dramatically increased with irradiation time longer a constant value (about 1cV) 7 2 10 Harbin Institute of Technology in the electron energy, the ionization rate advantage, the avalanche ionization The electron density is rising sharply. Because they might like the green laser beam light emitted by green laser pointer .
Finally reach the value of the electron density and recombination rate, but also with the protection of gas. Laser plasma processing of metal vapor plasma, This is because the ionization energy of the ionization energy of the metal material below the protective gas, metal vapor ionization than the surrounding gas is easy. If the laser power density is high, while the surrounding gas flow is not sufficient, may also make the surrounding gas dissociation and formation of plasma. The plasma behavior of high power laser deep penetration, the plasma in the top of the bath will cause the absorption and scattering of light, changing the focus position, reduce the concentration of the laser power and heat, can affect the welding process.  green laser pointer  is used to show others which stars they want to observe.