xiehe model

Impeller processing belongs to curved surface processing and requires five-axis equipment. Five-axis machine tools can process some curved surfaces that three-axis machine tools cannot process; they can also process blades and even add text. The importance of impeller processing in our country is self-evident. Below, the editor will give you a brief introduction to the instructions for surfacing spray welding on the surface of the impeller blades.

Impeller processing blade surface heaping: select a certain surfacing rod (or welding wire), manual arc (or automatic welding) welding on the parts of the blade that are prone to wear, in order to increase the surface area of the blade, protect the blade, and extend the life of the blade. Blade cladding electrodes generally use D217, D237, D317B, D707, D717, etc. D217 and D237 cladding metals belong to horse body steel and have certain wear resistance, but have a greater tendency of cladding cracks. D317B surfacing material is made of a large amount of tungsten carbide and a large number of tungsten carbide (WC) particles distributed on the metal matrix. Due to the high melting point and hardness of WC, the weld bead metal has high hardness, impact resistance, hardness HRC≥60, and the tendency of cladding metal to crack is small.

Impeller processing surface spray welding (spray coating): The spray welding method uses a heat source to spray and melt self-fluxing alloy powder on the surface of the workpiece to form a dense spray welding layer. Various types of wear-resistant powders basically use Ni-Cr-B-Si series nickel-based spray welding powders. The basic structure of the spray welding layer is solid solution Ni-Cr-Fe, containing a large amount of boron compounds and tungsten carbide. WC particles are evenly distributed in the Ni-based spray layer, which is uniform and discontinuous, but can form a skeleton with a hardness as high as HRC70. The Ni base material is filled in the skeleton and can withstand high abrasive wear after being washed away by abrasive particles. The surface hardness of spray welding is HRC55~70, and the basic composition of the flux is Ni60%+WC35%.