The technique of repairing casting defects in Guizhou;
Cold welding, common shortcoming, welding efficiency as welding and argon arc welding machine is high, but in the repair of millimeter level defects and machined surface defects, its outstanding advantages that people prefer to choose the cold welding.
Casting glue: simple, rough castings, general repair department does not require subsequent processing, and no special requirements of strength and hardness. The added value of this kind of castings is relatively low.
Welding repair: more than 90% of the Guizhou foundry manufacturers have chosen welding repair to solve the casting defects encountered in production. Repair welding by using filler metal (welding generally matched with casting material), welding performance can basically meet the standard of the parent material, and has the advantages of simple operation, high welding efficiency, many manufacturers have recognized and trusted. At present, there are many kinds of welding machines in the market, and there are several kinds of defects used in the defect repair.
Electric welding machine: the traditional way of welding and filling of cast iron and cast steel.
Advantages: repair large defects, high efficiency.
Shortcomings: the hardness of the welding spot is too high, the internal stress is stressed, and the crack is easy to produce. In general, the heat treatment is also needed to meet the processing requirements. And because of the limit of welding conditions, it is easy to produce two defects, such as gas hole, slag and so on.
Argon arc welding: Precision Casting (alloy steel, stainless steel casting), aluminum alloy die casting is mostly used for welding of argon arc welding machine. Some moulds are made and repaired, and the welding machine is also used to repair the defects of the mould.
Advantages: high welding efficiency and higher precision than electric welding machine. There are many kinds of welding wire, and the most widely used in stainless steel and aluminum alloy products. It can be used for welding, and the strength is high.