Aluminum plates have low density, high strength, high thermal and electrical conductivity, strong corrosion resistance, and possess excellent physical properties and mechanical functions. Therefore, they are widely used in various industries. Due to the improper selection of welding methods, the deformation of alloy aluminum plates and other factors have seriously affected the product quality and functionality. Here is an introduction to the welding methods of alloy aluminum plates for you.
Before welding, chemical or mechanical methods should be selected to strictly clean the surface oxide film on both sides of the weld groove. Chemical cleaning involves using alkali or acid to clean the surface of workpieces. This method can not only remove oxide films but also oil stains. The detailed process is as follows: soak in a 6% to 10% sodium hydroxide solution at around 70℃ for 0.5 minutes → water washing → soak in 15% nitric acid at room temperature for 1 minute for neutralization treatment → water washing → wash with warm water → dry. The surface of the washed aluminum alloy is a dull silver-white color.
Mechanical finishing can be done with pneumatic or electric milling cutters. Scrapers, files and other tools can also be used. For thinner oxide films, a 0.25mm copper wire brush can be used to grind and remove the oxide film. Welding should be carried out immediately after sorting. If the storage time exceeds 4 hours, it should be reorganized. During the welding process, the alloy aluminum plate expands due to heat, causing the gap at the weld groove to be reduced. If the installation gap is left too small before welding, it is necessary to determine the installation gap and the positioning welding distance.
During the welding process, the bevels of the two plates will stack, increasing the unevenness and deformation of the plate surface after welding. On the contrary, if the installation gap is too large, welding will be difficult and there is a possibility of burn-through. An appropriate positioning welding distance can ensure the required positioning welding gap. Therefore, choosing an appropriate installation gap and positioning welding distance is an effective way to reduce deformation. Based on experience, different plate thicknesses are more reasonable for the installation of seams.
