| 摘要 |
The present invention discloses an improved process for low pressure movable l-j blades with a 300 mw vapor turbine integrated belt, having a concave-convex profile on their transversal section and a cone-shaped, pine-type root, characterized by the steps of: (a) eliminating or cutting a stub and a vane end portion in the concave-convex profile blade, in the thickness zone which increases according to a line perpendicular to the blade axis; (b) preparing the blade end for welding by double "V" chamfering; (c) manufacturing a rectangular grafting from a laminated bar having the same material as the blade, by firstly pre-twisting the blade end in a special device, wherein the blade is double "V" chamfered; (d) the blade vane is firstly pre-twisted in a special device wherein the blade is positioned and tightened in the same operation position as that of the turbine rotor, in the direction tof the original twisting increment according to the design, for the purpose of compensating the welding process distortions; (e) welding the blade end grafting, which is performed in the same device wherein the pre-twisting step takes place, which is also included.
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