Cast aluminum alloy will produce slag turning during welding. It is difficult to produce by manual arc welding and argon arc welding. Could you tell me how to weld this material?
2. welding methodAlmost all kinds of welding methods can be used for welding aluminum and aluminum alloy, but aluminum and aluminum alloy have different adaptability to various welding methods, and various welding methods have their respective application. Gas welding and SMAW method, simple equipment, convenient operation. The gas can be used for welding of aluminum plate and casting of high welding quality requirements. Electrode arc welding can be used for repairing welding of aluminium alloy castings. Inert gas shielded welding (TIG or MIG) is the most widely used method for welding aluminum and aluminum alloys. Tungsten and argon arc welding or tungsten arc argon arc welding can be used for aluminum and its alloy sheets. Aluminum and aluminium alloy heavy plates can be made of tungsten helium arc welding, argon helium tungsten gas welding, MIG welding and pulse MIG welding. MIG welding and pulse MIG welding are more and more widely used (argon or argon / helium)
Aluminum and aluminum alloy welding methods 1. aluminum and aluminum alloy welding characteristics (1) aluminum in air and welding easily oxidized, the alumina (Al2O3) melting point is very high, very stable, not easy to remove. Melt and fuse hinder the parent material, a large proportion of the film, not easy to surface, easy to produce slag, incomplete fusion, lack of penetration. The surface oxide film of aluminum and the adsorption of a large amount of water are easy to cause porosity in the weld. Before welding, chemical or mechanical methods should be adopted to clean the surface and remove the oxide film on the surface. Strengthen protection during welding to prevent oxidation. Tungsten inert gas arc welding uses AC power source to remove the oxide film by means of "cathodic cleaning". Gas welding, the removal of oxide flux. In the welding, the welding heat can be increased, for example, helium arc heat, using helium or argon helium mixed gas protection, melting or the use of specification in gas arc welding, DC case, but does not need the cathode cleaning". (2) the thermal conductivity and specific heat capacity of aluminum and aluminum alloys are about two times greater than those of carbon steels and low-alloy steels. The thermal conductivity of aluminum is ten times higher than that of austenitic stainless steel. In the welding process, a large amount of heat can be quickly transmitted to the base metal, aluminum and Aluminum Alloy welding and energy consumption, in addition to a bath of molten metal, but also have more heat to unnecessary consumption of other parts of metal, this useless energy consumption than steel welding for welding is more significant. Joint access to high quality, we should try our best to adopt concentrated energy and power energy, sometimes by preheating process.
