First, the principle of laser welding laser welding can be continuous or pulsed laser beam to be realized, the principle of laser welding can be divided into heat conduction welding and laser deep penetration welding. Power density of less than 104 ~ 105W / cm2 for heat conduction welding, melting point depth, welding slow; when the power density of more than 105 ~ 107W / cm2, the role of the metal surface is heated sunken into a "hole" to form a deep penetration with a welding speed fast, large aspect ratio features. Heat conduction laser welding principle: laser radiation heating surface to be machined, surface heat through heat transfer based internal diffusion, by controlling the laser pulse width, energy, peak power and repetition frequency of the laser parameters, the workpiece is melted to form a specific pool. For welding and metallurgy gear plate welding laser welding machine is mainly involved in deep penetration laser welding. The following highlights the deep penetration laser welding works. Laser penetration welding generally use a continuous laser beam to complete the connection material, physical metallurgy and electron beam welding process is very similar to that energy conversion mechanism is through the "hole" (Key-hole) structure to complete. At sufficiently high power density of the laser irradiation, the material is evaporated and form apertures. The full steam holes like a blackbody absorbs almost all of the incident beam energy, bore the equilibrium temperature of about 2500 ℃, the heat from the high temperature of the bore wall pass out, so that surrounds the cavity around the metal melt. The aperture is filled in the lower wall of the high temperature steam beam irradiation material evaporation continuously generated, orifice walls surrounding the molten metal, the liquid metal is surrounded by solid material (which in most conventional conduction laser welding processes and welding, the first energy deposited on the workpiece surface, and then delivered into the interior by passing). Steam pressure liquid flow outside the cell wall and parietal surface tension and bore stalemate continuously generated and maintained homeostasis. Beam continuously into the holes, the outer holes of the material in a continuous flow, with the light beam to move, the flow orifice is always in a stable state. That is, the apertures and the molten metal around the hole wall of the forward speed of the beam with the preamble to move forward, the molten metal filling the voids left after removing holes and subsequently condensed, so the formation of weld. The above process all this happened so fast, so that the welding speed can easily reach several meters per minute. Advantages of stainless steel, laser welding machine: Compared with conventional welding, low-power pulsed laser seam welding with high power density, energy concentration, heat input is small, narrow and weld distortion, etc, and focusing the laser beam can be obtained after a small spot, can be precise positioning, these features make a laser welding seam welding method is more suitable than the other for welding the small size of the workpiece. For the laser welding of thin stainless steel material, because the material is very thin, it is easy to vaporize perforated, to obtain a continuous, non-burn-through weld. The key is accurate control of the parameters. The main parameters affecting the quality of the welding laser welding current, pulse width, pulse frequency, etc., which mainly affect the results as follows: (1) as the current increases, the weld width increases, the gradual emergence of spatter during welding, the weld the surface oxidation, and a rough sense. (2) increases with the pulse width of the weld width also increases. Impact of changes in pulse width laser welding of stainless steel thin plate effect is very significant. Small pulse width is increased, the sample may lead to oxidation and burn. (3) increasing the rate of spot overlap with the pulse frequency increases, the first weld width increases. After essentially unchanged. Under the microscope, more smooth and beautiful weld. However, the pulse frequency is increased to a certain value, welding spatter seriously, weld becomes rough, and the upper and lower surfaces of the weldment appear oxidation. Laser welding (4) thin plate material appropriate to adopt a positive defocus, in the case of the same amount of defocus, being away from the weld surface confocal laser welding to get smooth and beautiful than when negative defocus. Laser welding machine is a kind of the focused laser beam as an energy source, focused onto the workpiece to be welded to the metal, since the laser having an optical refraction properties, focus, etc., so that the laser welding is very suitable for micro parts and poor accessibility of the site welding. Laser welding also has a low heat input, low distortion, from electromagnetic influence, simple operation, stable, good weld results. High welding efficiency, simple operation, can be automated welding, suitable for welding various materials planar linear, circular and arbitrary trajectories. After the appearance of fine welding, weld not black, the product is not deformed, combined with higher merit!