The traditional EDM cladding repair machine uses the principle of instantaneous high-frequency discharge of sparks to instantly act on the surface of the workpiece after the ionic state of the nickel-based welding material or special welding material so that the welding material and the workpiece are metallurgically fused into one. The workpiece surface generates minimal heat during the entire welding repair process.
The traditional EDM cladding repair machine uses a rotating electrode in the welding gun, and the welding wire diameter ranges from 1.6-3.0mm, which is suitable for repairing casting defects; and the traditional EDM cladding repair machine can be used to set the power and discharge frequency. To strengthen the surface coating, it can repair various metals such as steel, copper, and aluminium.
1. Advantages The traditional EDM cladding repair machine is easy to install and operate and can be operated by ordinary personnel with little training. The welding repair strength is high. There is no annealing, no cracks, no deformation, and no internal stress in the welding repair parts. There will be no processing hard spots at the solder joints. The repair speed is faster than that of the chip placement machine, and the repair accuracy is relatively high. And it can pass X-ray flaw detection, penetration, tensile and other tests.
It has been accepted and used by many casting manufacturers. In addition, it also has some use value in mold repair.
2. Disadvantages The traditional EDM cladding repair machine is slow and takes about 3 minutes for 2mm cast iron. There are few corresponding welding materials, and only nickel-based welding materials can be used for cast iron parts (about 300 yuan/kg). The cost of welding repair is high, and the utilization rate of welding materials can only reach 80%.
The color difference is relatively large and the degree of bonding is low. Because the principle is high-frequency discharge, that is, granular surfacing, the bonding is relatively low compared to argon arc welding, and the density of non-ferrous metal pig iron parts is poor.
The smoothness is not high and cannot meet the requirements for high-smooth castings. Furthermore, due to the design principle of the traditional cold welding machine, the power is generally around 2000w, and the internal electronic components are exposed. In the environment of the foundry workshop, the machine often breaks down, especially the electrode gun (gas and electricity are separated and are easily damaged). It wastes energy and is not suitable for large-scale repair requirements of foundry manufacturers.
