Casting defects on the surface of the hottest chil

2022-08-16
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Casting defects on the surface of chilled cast iron

foundry glue

simple and extensive castings generally do not need subsequent processing at the repair place, and there are no special strength and hardness requirements. The added value of this kind of castings is relatively low

welding repair

more than 90% of the foundry manufacturers choose welding repair to solve the casting defects encountered in production. Due to the use of metal filler (welding materials generally match the casting material), the performance of the weld repair can basically meet the standard of the base metal, and the operation is simple, and the welding repair efficiency is high, which is recognized and trusted by many manufacturers. At present, there are many kinds of welding machines in the market. They are generally used in defect repair, including the following: electric welding machines: traditional methods are often used for welding repair of cast iron and steel castings. Advantages: high efficiency in repairing large defects. Disadvantages: after welding, the hardness of the solder joint is too high, there is internal stress, and it is easy to produce cracks. Generally, it also needs annealing heat treatment, especially after one year of rapid growth in 2012, it can meet the processing requirements. Due to the limitation of welding conditions, secondary defects such as pores and slag inclusions are easy to occur inside. Argon arc welding: precision castings (alloy steel, stainless steel precision castings), aluminum alloy die castings are mostly repaired by argon arc welding machine. Some mold manufacturers and repair manufacturers also use this welding machine to repair mold, which is energy-saving and has defects

1. Advantages: high repair efficiency and high precision compared with electric welding machine. There are many kinds of welding wires, and stainless steel and aluminum alloy products are the most widely used. It can be used for welding with high strength

2. Disadvantages: used for defect repair. When repairing small defects (pores, sand holes), there are traces on the edge of the molten pool due to excessive impact. There are hard spots on the welded steel parts. Due to heat effect, it is easy to produce thermal deformation when welding non-ferrous castings or thin-walled parts. High technical requirements for operation

cold welding machine

is a newly born repair technology in the early 21st century. Many iron ore projects have been abandoned technology. Because the workpiece generates very little heat during the welding repair process, it is called a cold welding machine. After several years of development, the application direction and technology of welding machine have been greatly developed, and it has occupied a large share in the repair market. According to the classification of repair products, there are: patch machine and electric spark surfacing repair machine

chip mounter

the principle of instantaneous high-frequency discharge is adopted to paste the welding piece (0..20mm) to the surface of the workpiece. The maximum thickness of each paste is equal to the thickness of the welding piece. The welding quality depends on whether the discharge is uniform. It is suitable for workpiece wear and out of tolerance repair, and has a certain influence in the mold market. The machine can also fill welding powder (or processing waste cutting) to defects (such as sand holes) and repair them after discharge. The color difference of the repaired workpiece is small. The disadvantage is that the repair speed is slow

cold welding machine

the common disadvantage is that the welding repair efficiency is not as high as that of electric welding machine and argon arc welding machine. However, when repairing millimetre level defects and machined surface defects, in addition to the additional classification of smoke generation toxicity of materials in A2, B and C levels, its outstanding advantages make people prefer to choose cold welding

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