When welding aluminum alloys such as gas welding, tungsten argon arc welding, it is necessary to fill the wire. Aluminum and aluminum alloy wire are divided into two major categories: homogeneous welding wire and heterogeneous wire. In order to obtain a good welded joint, it should be considered from the welding member to consider, and the wire suitable for the base material is selected as the filler material.
Choosing the weld wire First, consider the requirements of welds, and consider the mechanical properties, corrosion resistance, and structural rigidity, color and crack resistance of the product. Choosing the filling metal of the melting temperature is lower than the base material, which can greatly reduce the crystal interposedation of thermal affected zones. For the weld joint strength of the non-heat treatment alloy, according to the order of 1000 series, 4000 series, and 5000 lines.
The wire-containing 5000 wires of 5000 lines should be avoided in the use of a structure above 65 ° C, since these alloys are sensitive to stress corrosion cracks, stress corrosion cracks occur in the above temperature and corrosion environment. The welding wire is usually prevented from using a welding wire with a wire content than the base material, usually prevent the cracking tendency of the weld metal.
At present, most of the welding wire commonly used in aluminum alloy is a standard grade wire with similar metal components. When lack of standard grade wires, the narrow strip can be cut from the base metal. The more general welding wire is HS311. The liquid metal fluid is well fluid, and the shrinkage rate is small, and the specific anti-crack performance is specifically. In order to refine the seam grains, improve the crack resistance and mechanical properties of the weld, usually add a small amount of Ti, V, Zr or the like as a magazine.
