Both visual inspection and PT testing of the casting grate revealed varying degrees of cracks. On site, it was decided to cut the crack area, but the cutting section was not satisfactory. The cracks extended into the grate, and severe cracks could penetrate the entire section. Determine as a crack defect and reject the batch of products from storage. Research has found that there are designed sprues and risers in this area, and the number and design positions of sprues and risers will be optimized in subsequent production to avoid such problems.
