Laser welding characteristics of laser welding is a new type of welding, laser welding mainly for thin-walled materials, precision welding parts, enabling spot welding, butt welding, stitch welding, seal welding, etc., and its features are: a high aspect than the weld width is small, small heat-affected zone, small deformation, welding speed. Welds smooth, beautiful, without treatment, or simply post weld treatment processes. High weld quality, nonporous, can reduce and optimize the base metal impurities can be refined after tissue welding, weld strength and toughness at least equal to or even more than the base metal. Can be precisely controlled, focused small spot, high-precision positioning, easy to automate. Welding can be realized certain dissimilar materials. 3, welding materials and industrial applications can be used with a variety of laser welding of titanium, nickel, tin, zinc, copper, aluminum, chromium, niobium, gold, silver and its alloys, and steel, and other alloys Kovar Welding kinds of materials between, can also be applied to a copper - more dissimilar welding between copper and other metals - nickel, nickel - titanium, copper -, titanium - molybdenum, brass - copper, mild steel. It also is widely used in mobile communications, electronic components, glasses, clocks, jewelry, metal products, precision instruments, medical equipment, auto parts, gifts and other industries. 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 steel).