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High temperature laser welding

A technology for welding parts and welding wires, which is applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc. It can solve the problems of difficult temperature control and inability to maintain separate preheating

Inactive Publication Date: 2008-07-16
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Temperature is more difficult to control with this method, because the temperature can vary greatly from one part to the next due to the variation of each part
Also, separate preheating cannot be maintained during welding because the same laser beam is used for welding as for preheating

Method used

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  • High temperature laser welding

Examples

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Embodiment Construction

[0012] Referring to FIG. 1, a laser welding system 10 utilizes a preheating system constructed to completely enclose a workpiece, such as a turbine blade 12, within an enclosure 14 (shown in phantom) having An opening or window 16 exposing the area to be soldered. An inert gas, such as argon, is fed into the enclosure 14 at a velocity high enough to ensure that no air can enter through the weld window 16 . In an exemplary embodiment, the parts 12 are heated with induction heating, quartz lamps, or resistive heating coils to raise the temperature of the parts 12 to be welded to above 1500°F, and in some cases to 2000°F above (depending on particular application, alloy, etc.). These optional heating elements are indicated generally at 18 in FIG. 1 .

[0013] Filler material is supplied to the weld or joint by any one of several filler supply methods shown in Figure 2, or any combination thereof. Specifically, the filler material can be prepared by presetting one or more shims...

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PUM

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Abstract

A method of welding superalloy parts (12), comprising: preheating one or more parts to be welded to a temperature of at least 1500°F in a substantially enclosed inert gas atmosphere; supplying a plurality of filler materials (20, 22 or 26) To the welding zone, at least two of the above-mentioned fillers have different compositions; and one or more preheated parts are welded using a laser beam while maintaining the above-mentioned preheating temperature.

Description

technical field [0001] This invention relates generally to gas turbine technology and, more particularly, to laser beam welding methods for joining or repairing gas turbine components. Background technique [0002] Laser beam welding is increasingly used to join or repair gas turbine components, especially turbine blades and nozzles. These parts are often made of very high strength nickel or cobalt superalloys which are difficult to weld by conventional methods. Often, ductile fillers or shims are used to reduce the cracking tendency of the weld fusion zone and the heat-affected zone, but this reduces the mechanical capability of the weld relative to the base material. [0003] High temperature preheating has been used for some time in gas tungsten arc welding (GTAW) fabrication and repair of gas turbine blades. Current methods include preheating the blade tips to temperatures in excess of 1500°F with radiant or induction heating. This enables the use of high strength fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/32B23K26/14B23K26/42
CPCB23K26/123B23P6/002B23P6/005B23P6/007F01D5/005F05D2230/234B23K26/32B23K26/144B23K2101/001B23K2103/50
Inventor D·A·诺瓦克M·D·阿尔内特S·C·科蒂林加姆C·G·穆基拉
Owner GENERAL ELECTRIC CO