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At present, the industrial fan blades on the market are mainly made of aluminum alloy, because of its low density and high strength, high thermal conductivity, strong corrosion resistance, and good physical and mechanical properties. However, improper selection of welding method and welding process parameters will lead to serious mechanical deformation of Blade due to over-concentration of welding force, or due to insufficient weld porosity, Slag Inclusion and incomplete penetration, etc. The quality and performance of the products are seriously affected by the weld metal crack or material porosity. Aluminum is a silver-white light metal with good plasticity, high conductivity, thermal conductivity, oxidation resistance and corrosion resistance. Aluminum is highly oxidised to produce aluminium oxide films, which produce inclusions in welds, which damage the metal's continuity and uniformity, reducing its mechanical properties and corrosion resistance. This is in the welding of aluminum alloy is very difficult to avoid, so we need to understand the aluminum alloy welding should pay attention to the place (1) easy to be oxidized. In the air, aluminum easily oxidizes, resulting in a dense aluminium oxide film (thickness about 0.1-0.2 mm) with a very high melting point (about 2050 °c) , which greatly exceeds the melting point of aluminum and its alloys (about 600 °c) (2) prone to blowhole. Hydrogen is the main factor for the formation of pores in aluminum and aluminum alloys during welding. Because liquid aluminum can dissolve a large amount of hydrogen, but solid aluminum can hardly dissolve hydrogen, so when the bath temperature is rapidly cooled and solidified, hydrogen can not escape POROSITY is easily formed in the weld. At present, it is difficult to completely eliminate the hydrogen hole, the hydrogen source has many, (3) when the weld deformation and the forming crack tendency is big. Aluminum Linear Expansion Coefficient and crystallization shrinkage are about twice larger than steel, easy to generate greater welding deformation stress, rigid structure will accelerate the formation of hot cracks (4) burning of the alloy elements by evaporation. Aluminum alloys contain low boiling point elements (such as magnesium, zinc, manganese, etc.) . Under the action of high temperature arc, it is easy to evaporate and lose, thus changing the chemical composition of the Weld metal and reducing the weld performance (5) low temperature strength and plasticity. The strength and plasticity of aluminum is very low at high temperature, which destroys the formation of weld metal and sometimes causes the collapse and wear of weld metal. Of course, this is only welding should pay attention to the problem, these understanding, we need to understand the industrial fan blade welding process (1) the preparation before welding, the use of chemical and mechanical methods, Strictly Clean The weld groove on both sides of the surface oxide film (2) to determine the assembly gap and the positioning welding distance. During the welding process, the aluminum plate is expanded by heat, which reduces the gap between the welding seams and the groove. If the pre-welding assembly gap is too small, the overlap of the groove between the two plates will occur during the welding process Increase the flatness and deformation of the welded plate. If the clearance is too large, it is difficult to weld, and there is the possibility of burning through. A certain distance between the two welds can ensure the required distance between the two welds, and the suitable distance between the two welds can be selected as an effective measure to reduce deformation (3) choose welding equipment, there are many kinds of welding products in the market, usually it is best to use AC TIG (TIG welding) . The utility model relates to a welding method for welding a base metal and a filling welding wire by using an electric arc generated by a tungsten electrode and a workpiece under the protection of Argon Gas (4)301 pure aluminum wire and 311 aluminum-silicon wire are usually used for selecting welding wire (5) welding method parameters are usually selected by left welding method, welding torch and workpiece will be 60 angle. When the thickness of welding is 15mm, the right welding method is used, and the welding torch and the workpiece will form a 90 angle. When the thickness of the welding wall is more than 3mm, open the V-groove, the angle is 60 ~ 70, the gap can not be more than 1mm, with multi-layer welding method to complete. When the wall thickness is less than 1.5 mm, there is no groove, no gap and no filling wire. When welding the butt joint of fixed pipe, if the pipe diameter is 200mm, the wall thickness is 6mm, should use the tungsten electrode with the diameter of 3 ~ 4mm, the welding current of 220 ~ 240A, the filler wire with the diameter of 4mm, and use 1 ~ 2 layers to weld.

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