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From the table shows that the plasma cloud size and the protective gas changes, the minimum helium, nitrogen, followed by argon. Plasma sizes, and the penetration depth is more shallow. The reason for this difference is first of all because of the different degree of ionization of the gas molecules, the other protective gas density caused by the metal vapor diffusion difference. Helium ionization minimum, the minimum density, it can quickly get rid of the metal vapor rising from the metal bath. With helium as the shielding gas, the maximum degree of inhibition of plasma, thereby increasing the penetration depth and welding speed; light can escape, it is difficult to cause stomata. Of course, from the effects of actual welding, argon protective effect is pretty good.   green laser pointer can benefit the customer in every way.
The plasma cloud penetration effects are most obvious at low welding speed zone. When the welding speed increases, its impact will be reduced. The shielding gas to reach the surface through the nozzle exit pressure injection, hydrodynamic shape and diameter of the exports of the nozzle size is very important. It must be large enough to drive the spray of the protective gas covered surface, but in order to effectively protect the lens to prevent the metal vapor contamination or metal splash damage to the lens, nozzle size should be limited. The flow must also be controlled, otherwise laminar flow becomes turbulent protective gas atmosphere involved in the bath, and ultimately the formation of pores.    green laser pointer    can be applied in the X-ray film teaching.
In order to improve the protective effect, but also with additional lateral blowing through a smaller diameter of the nozzle, shielding gas holes at an angle directly into the deep penetration welding. The shielding gas is not only inhibited the surface of the plasma cloud, and to exert influence on the formation of the hole plasma and holes, deep penetration further increase, deep wide comparison of the ideal weld. However, this method requires precise control of gas flow size, direction, otherwise easily lead to turbulence and destruction of the molten pool, leading to the welding process is not stable. Lens focal length. Welding usually focus the convergence of the laser is generally used in the 63 ~ 254mm (2.5 "~ 10") focal length lens.   laser pointer can make the audience lighted-hearted.
The focused spot size and focal length is proportional to, the shorter the focal length, the smaller the spot. Focal length length also affects the depth of focus, depth of focus with the focal length increased simultaneously, so a short focal length can increase the power density, but the depth of focus small, must be accurate to maintain the spacing of the lens and the workpiece, and the penetration depth is not large. Spatter and laser mode by the welding process, the actual welding using the shortest focal deep multi-focal length of 126mm (5 ") when larger joints or by increasing the spot size to increase the weld can be Select 254mm (10 ") focal length lens, in this case, in order to achieve the deep penetration in pinhole effect, require a higher laser output power (power density).   green laser is a useful tool for travelling.
When the laser power exceeding 2kW, especially for the 10.6μm of CO2 laser beam, since the special optical materials constitute the optical system, in order to avoid the danger of focusing lens has been optical damage, are often selected reflection focusing method, generally using the mirror of polished bronze mirrors for reflection . Due to effective cooling, it is often recommended for high-power laser beam is focused. Focus position. Welding, in order to maintain sufficient power density, the focus position is essential. The focus of the relative position of the surface changes directly affect the weld width and depth. Figure 2-6 shows the focus position on the 1018 steel penetration and slit width effects. In most laser welding applications, usually the location of the focus is set below the surface about the required penetration depth 1/4. This kind of   200mw laser pointer is the smallest green light pen.