When aluminum is extruded or rolled out, it is processed without any polishing or chemical treatment. The surface of natural material can be called light surface.
The blank is not oxidized on the surface. After oxidation, the surface of the profile will form a layer of oxide film. After oxidation, the surface of the section is bright, and the length of the blank will be oxidized naturally.
Aluminum alloy is the most widely used nonferrous metal structure material in the industry. It has been widely applied in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. With the rapid development of industrial economy, the demand for aluminum alloy welded structures is increasing, and the research on the weldability of aluminum alloy has also been deepened.
