Small-diameter valve plays an important role in thermal power stations

Electric regulating valve power station high temperature and high pressure steam and water supply pipes, as well as bypass valves on large diameter valves, often use small diameter high temperature and high pressure forged cut-off valves, which occupy an important position in thermal power stations, is a key product of power station auxiliary machines. one.

China's current production of small-diameter high-temperature high-pressure globe valve sealing surface is mostly manual arc welding 547Mo and 557Mo, as well as drilling chromium tungsten alloy. This type of process has a small valve diameter and difficulty in welding, which results in low production efficiency, poor process stability, and consequent reduction in yield. Due to the high dilution ratio of the substrate to the surfacing layer, the material of the surfacing layer is seriously wasted, and the manufacturing cost of the valve is increased. Laser cladding technology has developed rapidly in the past decade and has been successfully used in the processing of various components. The welding of the sealing surface of the small-diameter globe valve is also an example. Compared with manual surfacing, it has the characteristics of high energy density and easy control. It can non-contact heating the sealing surface of small-diameter globe valve and effectively weld the sealing surface. Laser cladding is usually difficult to apply to small-diameter deep-hole valves by the binder pre-coating method and the automatic powder feeding method. The inductive pre-injection method we invented uses a high-energy-density laser beam, heating and melting. The molded alloy ring placed on the sealing surface of the small-diameter valve forms a laser-clad alloy layer which is well bonded to the sealing surface substrate. The press-bonded rings of iron-based, nickel-based and drill-base alloys can be separately selected to obtain a wear-resistant and corrosion-resistant sealing surface alloy layer suitable for different working conditions. In order to ensure a certain strength of the sealing surface, we adopt a double-layer cladding method and screen through the process. The sealing surface is scanned with a variable speed. The microstructure and density of the cladding layer are better than the uniform scanning. The specific process is that the laser beam first scans the sealing surface with a certain acceleration, and then scans the field to the starting point at a constant speed. After the first layer of the steam pressure reducing valve is finished, the second layer of powder is placed to The above method coats the second layer of powder to form a cladding layer having a certain thickness.

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