In the precision machining process of precision castings, grinding and polishing should be used to clarify the mechanical and equipment of the defect surface. After grinding and polishing the cast parts, their specifications can more effectively meet the dimensional tolerance standards of the castings. So, if precision castings occur during the production and processing of casting, how can they be corrected? Actually, it can be corrected mechanically, so let me share it with you!

Precision castings can be directly welded for repair during use. When the machine equipment is repaired by GTAW welding, the surface area and depth of the welding should meet its standards. Here, the surface area of welding and repair in machine equipment refers to the surface area after expansion and repair.

Precision castings cannot be welded or repaired more than three times at the same location. The distance of the casting at the edge of the welding area involves the reverse welding area. It is important to remember that it should not be lower than the sum of the diameters of two adjacent welding areas.

After heat treatment and tempering, the mechanical properties of precision castings should also be tested. The surface area of the TIG arc welding of castings should not be less than 2cm2. The distance between the welding area of the machine and equipment is 100mm.

Precision castings are not allowed to have cracks or incomplete welding in the welding area. In all welding areas, castings are allowed to have pores with a diameter not exceeding 2 mm and a wall thickness not exceeding 1/3. The machine equipment margin at 10 mm is invalid.

Precision casting is not allowed to apply welding flux to cast parts and mechanical equipment in corrosive media and atmosphere during welding repair. Penetration treatment should be carried out on the compactness of precision casting according to the allowed standards.