Name: crawler joint

Material: G35CrNiMo

Weight: 350KG

In casting production, the quality of marine castings should be controlled and inspected. The process rules and technical conditions for the control and inspection of each specific product from raw materials and auxiliary materials shall be formulated first. Each process shall be controlled and inspected in strict accordance with the process rules and technical conditions. After that, the quality of finished castings shall be inspected. Reasonable testing methods and appropriate testing personnel shall be provided. Generally, for the appearance quality of the casting, the surface roughness of the casting can be judged by comparing the sample blocks; Fine cracks on the surface can be inspected by coloring method and magnetic particle method. For the internal quality of castings, audio, ultrasonic, eddy current, X-ray and γ X-ray and other methods.

The casting defects of sand mold casting include: cold shut, insufficient pouring, air hole, sand sticking, sand inclusion, sand hole, sand expansion, etc.

The inspection of castings mainly includes dimensional inspection, visual inspection of appearance and surface, chemical composition analysis and mechanical property test. For castings with important requirements or easy problems in casting process, non-destructive testing is also required. The non-destructive testing technologies that can be used for the quality inspection of ductile iron castings include liquid penetrant testing, magnetic particle testing, eddy current testing, radiographic testing, ultrasonic testing and vibration testing.