What type of welding is used for aluminum?

 　　The following welding processes are available for


aluminum:

　　GTAW/TIG

　　GMAW/MIG

　　Laser beam welding and electron beam welding

　　Resistance welding

　　GTAW/TIG

　　One of the most popular welding processes for aluminum is tungsten inert gas welding (GTAW), also known as tungsten inert gas shielded (TIG) welding. GTAW is a good process for aluminum because it does not require mechanical wire feeding, which can cause feedability issues. On the contrary, the filling material is manually fed into the water pit by the welder. In addition, the GTAW process is very clean and can prevent aluminum from being polluted by the atmosphere.

　　GMAW/MIG

　　Gas shielded welding (GMAW) or metal inert gas (MIG) welding is another good choice for welding aluminum. Gas shielded welding usually has a higher deposition rate and faster travel speed than GTAW. However, GMAW uses a mechanical wire feeding system. Therefore, it may be necessary to use a push-pull gun or a sliding shaft gun in order to deliver the aluminum wire. In addition, it is important not to use 100% CO2 or 75% argon/25% C02 shielding gas. This gas is a feasible choice for steel, but aluminum cannot handle reactive C02 gas. Follow the recommendations of the filler metal manufacturer regarding the type of protective gas.

　　Laser beam welding and electron beam welding

　　The beam welding process is usually very capable of welding aluminum. In addition, due to the high power density of the beam welding process, cold start is not very important. When using laser welding, the material's light reflectivity may be an issue. In addition, the optimization of shielding gas is the key to avoiding porosity. Electron beam welding usually does not have these problems because it does not use light as an energy medium, but rather operates in a vacuum.

　　Resistance welding

　　Resistance welding can be performed when welding aluminum. However, the conductivity and thermal conductivity of aluminum pose difficulties. The parameter development time may be long and special tips and resistance welding equipment may be required to overcome these challenges.

　　The process of welding aluminum is not recommended

　　There are several processes that are not suitable for welding aluminum. Any welding process using flux, such as bar welding, flux cored arc welding and submerged arc welding, is usually not an effective method for welding aluminum. Usually, the welds generated by these processes can lead to a large number of pores.



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