Stainless steel are the following: Model 301 - scalability for molding products. It can also be rapidly hardened by mechanical processing. Good weldability. Abrasion resistance and fatigue strength than 304 stainless steel. 302 Model 304 with corrosion resistance, due to relatively high carbon intensity and therefore better. Model 303 - by adding a small amount of sulfur and phosphorus to more than 304 cutting. Model 304- general model; that is 18/8 stainless steel. GB grades 0Cr18Ni9. Model 309 - 304 - better temperature resistance. Model 316 - After 304, the second most widely used of steel, mainly used in the food industry and surgical equipment, add molybdenum to obtain a special corrosion-resistant structure. Than the 304 because it has better resistance to chloride corrosion and thus as "marine steel" to use. SS316 is often used to fuel recovery. 18/10 grade stainless steel is usually in line with the application level Model 321 in addition to the added titanium elements to reduce the risk of material other than the corrosion of the weld performance similar to 304. 400 Series - ferritic and martensitic stainless steel type 408 - good heat resistance, low corrosion resistance, 11% Cr, 8% of Ni. Model 409 - the cheapest model (BAR), commonly used as automobile exhaust pipe, is a ferritic stainless steel (chrome laser welding machine technical principles: Laser welding can be continuous or pulsed laser beam to be realized, the principle of laser welding can be divided for heat conduction welding and laser deep penetration welding power density of less than 104 ~ 105 W / cm2 for heat conduction welding, then melt depth, welding slow;.?? power density greater than 105 ~ 107 W / cm2, the lower metal surface heating effect recessed into a "hole" to form a deep penetration, with welding speed, aspect ratio features which heat conduction laser welding principle is:? laser radiation heating surface to be machined, surface heat through heat transfer based internal diffusion, by controlling the laser width, energy, peak power and pulse 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 related to laser penetration welding.? laser penetration continuous laser beam welding is generally completed connecting material, metallurgical and physical process is very similar to the electron beam welding, i.e., the energy conversion mechanism is through the "holes" (Key-hole) structure to be completed. a sufficiently high power density of laser irradiation in , the material is evaporated and the formation of small holes. The holes filled with steam like a blackbody absorbs almost all of the incident beam energy, bore the equilibrium temperature of about 2500 0C, from the high-temperature heat transfer out of the cavity wall, enclosing The bore of the molten metal around the inner hole is filled in the lower wall of the beam irradiation temperature steam evaporation material continuously generated, orifice walls surrounding the molten metal, the liquid metal is surrounded by solid material (which in most conventional soldering conduction process and laser welding, the energy is first deposited on the surface, and then transported to the inside pass by). steam pressure outside the cell wall and parietal surface tension of the liquid flow and bore continuously generated stalemate and maintain 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 cell walls of the holes and around the molten metal with the forward movement of the forward speed of the leading light beam, After the hole is filled with the molten metal is removed to leave voids and subsequently condensed, thus forming the weld, all of which the occurrence of the above-described procedure was so fast, so that the welding speed can easily reach several meters per minute.