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The different forming processes of nickel-steel-titanium tee are discussed

It is reported that no sewn nickel steel titanium tee manufacturing is a difficult technology, cutting and welding method can not be made no sewn tee, machine addition cost consumables are only applicable to smaller size specifications tee manufacturing. Cold extrusion method and end shrinkage method are the essence of manufacturing tee. The cold extrusion method uses the metal at the two ends to flow to the middle to obtain the material needed for the convex end. The convex end material required by the end shrinkage method is original, and the excess material at the two ends thickens the end. The end shrinkage method has low yield but small metal flow variable, which is beneficial to the material with insufficient plasticity to successfully manufacture tee.

Due to the poor plasticity of titanium at room temperature, the thermal processing method of end shrinkage is adopted for the tees above DN50. DN25 below the nickel, steel, titanium three general rules are the use of forging machinery processing method. Nickel and steel have good plasticity at room temperature, so the tee above DN50 adopts cold extrusion method and end shrinkage method; The bulging press with higher production efficiency can be used under the condition of large batch, and the sleeve die one-way cold extrusion can be used when the quantity is small. A small number of large specifications of the product (generally refers to DNI5 above) is the end of the shrinkage method, and the cutting welding method is only applicable to the product requirements are not high occasions.

The manufacture of unstitched tees is limited to products with some thickness, and no suitable manufacturing method has been found for products with very thin wall thickness.

In general, different manufacturing methods should be used for different materials, different sizes and different batches. There is currently no ideal manufacturing process for DN25 to DN50 tees, and researchers are working on a new process that will produce this range of nickel-titanium tees with good quality.