Method and apparatus for welding workpieces made of superalloys
First Claim
1. A method for welding a workpiece made of a superalloy comprising placing in a container a workpiece to be welded made of a superalloy, conveying a protective gas through said container around said workpiece, electrically energizing an electrical induction coil disposed in said container around said workpiece in a region thereof to be welded, to preheat the workpiece in said region, arc welding said region of said workpiece subsequent to the preheating thereof, and sensing the temperature of said workpiece during the heating thereof by said induction coil to control the electrical energization of said induction coil for maintaining said preheating of said workpiece at a substantially constant, predetermined value.
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Accused Products
Abstract
Apparatus for the deposition welding or the joint welding of a workpiece made of a superalloy by an arc welding process in which the workpiece is supported in a protective-gas container into which is placed a welding electrode and an induction coil for preheating the workpiece. Material of the same type of the workpiece is applied to the surface of the workpiece or to a welding joint thereof by arc welding produced by the welding electrode. The apparatus and associated method are particularly suitable for repairing age-hardened superalloys of engine blades.
107 Citations
17 Claims
- 1. A method for welding a workpiece made of a superalloy comprising placing in a container a workpiece to be welded made of a superalloy, conveying a protective gas through said container around said workpiece, electrically energizing an electrical induction coil disposed in said container around said workpiece in a region thereof to be welded, to preheat the workpiece in said region, arc welding said region of said workpiece subsequent to the preheating thereof, and sensing the temperature of said workpiece during the heating thereof by said induction coil to control the electrical energization of said induction coil for maintaining said preheating of said workpiece at a substantially constant, predetermined value.
- 5. Apparatus for welding a workpiece made of a superalloy comprising a container for receiving a workpiece to be welded made of a superalloy, duct means for conveying a protective gas through said container around said workpiece, an electrical induction coil in said container around said workpiece in a region thereof to be welded, means for electrically energizing said induction coil to preheat the workpiece in said region to be welded, arc welding means for welding said region of said workpiece subsequent to the preheating thereof, and means outside said container for sensing the temperature of said workpiece during the heating thereof by said induction coil to control the means which electrically energizes said induction coil for maintaining said preheating of said workpiece at a substantially constant, predetermined value.
Specification