1. Pitting (pitting): general pitting occurs in the appearance of the steel plate, in the punching and shearing, molding process constitutes a serious impact. Sometimes, significant pitting will be observed in the steel coil exposed to the outer layer, this situation in the open air on the other side of the steel coil and steel pipe without concealment of the presentation. Significant pits on the surface of steel plates with a thickness of t1.6 or t2.0 have a serious impact on the strength of the plate.
2. scratches: scratches can be seen in the construction process, especially in the movement of parts and materials or transportation process, steel edge or bar bumping led to the appearance of damage. Deep scratches can affect strength and have a negative effect on the paint.
3. Indentation: Indentation found on the exterior of coils during the pre-treatment stage occurs as a result of incorrect rolling or forming processes. Generally, it is a straight line running the entire length of the part. In a bad case, it is unfortunate that the indentation is found in the corner post, which will lead to the failure of the stacking test.
4. Deformation and distortion: If the molded wave plate is distorted, it will cause the scale/tolerance of the installation to be out of control, which will further affect the welding molding.
5. Bump marks: This damage is assumed to be caused by the fixed part of the bump. For example, in-line fixtures. Sometimes, the crater will be found after the big combination (before the second sanding). If this condition often occurs, there must be a full line of inspection to ensure that the container on the line unimpeded.
6. Lock corrosion: for the lock rod, if there is a prior poor welding forming, weld appearance (good and bad) rough, then it is difficult to get a good galvanized effect, which will simply lead to weld corrosion. Such shortcomings will lead to fierce complaints and claims from the owner.
Post time: Dec-06-2024