Abstract in simplified Chinese:一种用于修理一定子叶片部分之一足部的方法包括确定一具有一待修足部之铸造定子叶片部分的位置之步骤。然后,将该需要修理之足部的一受损部分从该铸造定子叶片部分处移除下来。接着,利用一电子束熔接将一替换用之足部区段固定至该铸造定子叶片部分上。最后,将该替换用足部区段机械加工至一适当之形状。
Abstract:
A method of welding using a weld filler additive and a weld filler additive are provided. The method includes the step of welding the component with a filler additive comprising a sufficient amount of each of Co, Cr, Al, Ti, Mo, Fe, B, C, Nb, and Ni, the component including a hard-to-weld base alloy. The method further includes the step of forming an easy-to-weld target alloy on a surface of the component from the welding.
Abstract:
A steam turbine different material welded rotor, constructed by rotors of different materials being jointed together by welding has the strength of a jointed portion increased and inspection of the jointed portion facilitated. A bearing portion rotor 1 and high temperature portion rotor 2 are jointed at weld portion A, the high temperature portion rotor 2 and low temperature portion rotor 3 at weld portion B and the low temperature portion rotor 3 and bearing portion rotor 4 at weld portion C. Cavity portions 5, 6 are formed in the weld portions B, C, respectively. Inspection holes 7, 8 are also provided in the weld portions B, C. The high temperature portion rotor 2 is made of high heat resistant 12Cr steel and other rotors are made of low alloy steel, wherein the rotor 1 is of 2.multidot.1/4 CrMoV steel and the rotors 3, 4 are of 3.multidot.1/2 NiCrMoV steel. Thus, the materials are less expensive and inspection of the weld portions becomes facilitated by the inspection holes 7, 8 and the cavity portions 5, 6.
Abstract translation:由不同材料转子构成的蒸汽涡轮机不同材料的焊接转子通过焊接接合在一起,具有接合部分的强度增加,并且接合部分的检查变得容易。 轴承部分转子1和高温部分转子2在焊接部分A,高温部分转子2和低温部分转子3处在焊接部分B和低温部分转子3以及轴承部分转子4的焊接部分C 分别在焊接部分B,C中形成腔部5,6。 检查孔7,8也设置在焊接部分B,C中。高温部分转子2由高耐热12Cr钢制成,其他转子由低合金钢制成,转子1为2x + E, 1/4 + EE CrMoV钢,转子3,4分别为3x + E,1/2 + EE NiCrMoV钢。 因此,材料成本较低,并且通过检查孔7,8和空腔部5,6便可以使焊接部的检查变得容易。
Abstract:
A protective gas shroud for welding is provided by: positioning an article into a chamber having an opening at the top to permit welding of the article; introducing argon into the body of the chamber to act as a protective gas shroud for the article during welding; introducing helium into the open top of the chamber to assist in maintaining a protective gas shroud around the article during welding; and welding the article within the protective gas shroud.
Abstract:
A fabricated gas turbine engine component and method of manufacturing. In one embodiment the component having a structural member with a cover member metalurgically bonded thereto. The bonding of the cover member being controlled by an apparatus that sequentially applies a substantially non-unifrom bonding load across the components radius of curvature. The patterns utilized in the casting process are formed in one embodiment to a precision preformed geometry by a closed die forming operation.
Abstract:
A filler material is melted into a metallic substrate having a defect under conditions chosen to preclude cracking. In a preferred embodiment of the invention, a laser beam is operated at a relatively low power density and at a relatively large diameter for an extended length of time to produce a molten pool with a low aspect ratio.
Abstract:
A system for repairing worn, distorted, cracked, or degraded portions of high temperature rotors such as those used in high-pressure and reheat steam turbines is disclosed. The repairs are applicable to low alloy steels generally described in ASTM Specification A-470 classes 3, 7, and 8. Explicit controls on the welding process, the welding consumables, and the placement of the weld fusion line are disclosed. For the welding process, a novel staging of the "relative heat input" for applying the initial cold wire gas tungsten arc weld (GTAW) buttering layer is disclosed. Significantly, the optimum weldment properties are achieved in the cold wire GTAW by utilizing a lower heat input for the crucial second layer relative to the first layer. Faster deposition or weld build-up is achieved over the buttering layer by applying the balance of welding through utilization of the hot-wire GTAW process. Hot-wire weld integrity is assured by control of a helium-argon cover gas mixture, application of a trailing gas shroud, weld-head oscillation, and control of the wire insertion point into the molten puddle. For the weld deposit, a specially modified 9Cr-1Mo filler metal based on the "Grade 91" alloy developed by the Oak Ridge National Laboratory is selected. Additional stringent controls are placed on the chemical composition of the weld wire. Finally, judicious placement of the weld fusion line to insure long service is achieved by a detailed finite-element stress analysis. Near the fusion line, the stresses are limited to values below the minimum stress-rupture strength of the base metal as described by a correlation using the Larson-Miller time-temperature parameter.