Check the surface of the aluminum tube

The surface of the aluminum tube should be smooth without cracks corrosion and inclusions.

The surface of the aluminum tube is allowed to have slight peeling, blistering, abrasions, bumps, and pits, but the depth cannot exceed the allowable deviation range of the inner and outer diameters of the aluminum tube, and the minimum allowable size of the aluminum tube must be guaranteed.

The surface of the aluminum tube is allowed to have extrusion flow lines caused by the mold, oxidation color, and non-rough black and white spots.

It is allowed to have straightening spiral lines on the surface of the aluminum tube, which do not affect the outer diameter, and the depth cannot exceed 0.5 mm.

The thickness of the aluminum tube should comply with the requirements of the corresponding technical standards for the finished product.