To ensure the craftsmanship quality of the shredder blade, the shredded blades after welding should be carefully inspected to identify and improve any defects. Before inspection, the shredded blades must be sandblasted or gently ground to remove any weld material and impurities adhering to the blade surface, and then cleaned thoroughly with fire oil. The items and requirements for inspection are as follows:

One, inspect the weld strength by grinding the back of a shredder blade with a green silicon carbide wheel. Check the thickness of the solder layer, which should be below 0.15 millimeters. There should be no air holes or lack of solder at the blade tip support bottom surface. Weld gaps that are not filled should not exceed one-tenth of the total length of the weld. Air holes can cause the blade to crack during shredding.

Inspect the position of the shredder blade within the blade groove. If the blade is misaligned or hanging beyond the specifications of the skill level, it should be resoldered.

To inspect the welding strength, gently tap the blade with a wooden hammer or a copper hammer, or strike the blade rod forcefully with a hammer; if the blade does not fall out of the groove, it passes the test. There is no need to inspect each blade individually for welding strength.

Inspect the flatness of the shredder blade. If there are obvious dents on the blade, it indicates that the blade has overheated and deformed, and it should be resharpened or a new blade should be welded.

Five, inspect for cracks: After the shredder blades are cleaned with kerosene, if there are cracks on the blades, the kerosene will seep into the cracks, forming a black line visible to the naked eye, or can be examined with a magnifying glass between 10-40 times. To check for blade cracks, color penetrant inspection can also be used. Place the cutting blade part in the solution for 10-15 minutes, then rinse with clean water, apply a layer of white soil, dry it, and inspect its surface. If there are cracks on the blade, the color of the solution will be visible on the white soil, which can be seen with the naked eye. Shredder blades with cracks should not be used and will require re-welding.