Dongguan Sheng Cade magnesium alloy welding difficulty (1) easily oxidized. In air, aluminum oxide combined with easy to produce a dense aluminum oxide film (thickness of about 0.1-0.2μm), high melting point (about 2050 ℃), far more than the melting point of aluminum and aluminum alloys (about 600 ℃ or so). Alumina density 3.95-4.10g / cm3, about 1.4 times the aluminum surface of the alumina film easy absorption of moisture, welding, it prevents the fusion of basic metals, easy to form pores, slag, lack of fusion defects, performance degradation caused by welding. (2) easy to produce pores. Aluminum and aluminum alloys mainly pores generated during welding is hydrogen, since a large amount of liquid aluminum soluble hydrogen and solid aluminum hardly dissolves hydrogen, so that when the bath temperature is rapidly cooled and solidified, hydrogen too late to escape easily in the weld cracks aggregate to form pores. Hydrogen hole is difficult to completely avoid aluminum die casting, aluminum die many sources of hydrogen machined parts, there is an atmosphere of hydrogen electric arc welding, aluminum welding wire surface oxide film adsorb moisture in the air and so on. Practice has proved that even argon by GB / T4842 standards, purity of 99.99%, but the moisture content reaches 20ppm Dongguan aluminum die-casting process, there will be a lot of dense pores, when the air relative humidity exceeds 80% If you do not take measures such as heating, weld porosity will clearly emerge. At the same time the production of aluminum die-casting process, using a small welding current slow, increase the weld cooling time, and use the pool stir welding arcs can better help the bath exhaust gases. Dongguan Sheng Cade aluminum alloy material handling charge before use charge shall be subject to blowing sand to remove surface rust, grease and other contaminants. Place not long, relatively clean surface of aluminum ingots and metal type can charge back without blowing sand, but it should be within the charge to eliminate mixed iron filters and inserts, all of the charge in the furnace should be pre- heat to remove the moisture attached to the surface, to shorten the melting time of 3 hours or more. Aluminum die casting | aluminum die-casting process | Cade by Sheng Sheng Technology Co., Ltd., Dongguan City, Cade. Sheng Technology Co., Ltd., Dongguan City, Cade (www.kadesn.com) strong, credible, in other industries, Guangdong Dongguan accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Cade Sheng and you hand into the brilliant, for a better future!