Articles cast with molten iron are collectively referred to as iron castings. Due to the influence of many factors, there are often defects such as pores, pinholes, slag inclusions, cracks, pits and so on.
Including appearance quality, internal quality and use quality. Appearance quality refers to the surface roughness, surface defects, dimensional deviation, shape deviation and weight deviation of castings; It mainly refers to the and metallographic structure of the casting, as well as the holes, cracks, inclusions and segregation existing in the casting; Service quality refers to the working durability of iron castings under different conditions, including wear resistance, corrosion resistance, chilling and heat resistance, fatigue, shock absorption and other properties, as well as machinability, weldability and other process properties.
Due to the influence of many factors, iron castings often have defects such as pores, pinholes, slag inclusions, cracks, pits and so on. The commonly used repair equipment is argon arc welding machine, resistance welding machine, cold welding machine, etc. For casting defects with low quality and appearance requirements, argon arc welding machines and other welding machines with high calorific value and high speed can be used to repair them.
The quality of iron castings has a great influence on the performance of mechanical products. For example, the wear resistance and dimensional stability of machine tool castings directly affect the accuracy and service life of machine tools; The size, accuracy and surface roughness of the impeller, shell and inner cavity of hydraulic parts of various pumps directly affect the working efficiency of pumps and hydraulic systems, energy consumption and the development of cavitation; The strength and heat shock resistance of cast copper parts such as cylinder block, cylinder head, cylinder liner, piston ring and exhaust pipe of internal combustion engine directly affect the working life of the engine.