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Method and system for restoring parent metal properties across welds

A non-destructive, welding material technology used in metal processing, furnaces, heat treatment equipment, etc.

Inactive Publication Date: 2009-04-15
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Casting components such as, but not limited to, large sand castings (e.g. in the 5-35 ton range in the finished machined state) have some long-standing problems with manufacturing limitations
Occasionally, small defects are found to be inside previously welded areas

Method used

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  • Method and system for restoring parent metal properties across welds

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Embodiment Construction

[0014] An aspect of the present invention, such as but not limiting of the present invention, is to provide a production welding method and related system capable of producing large substantially NDT-indicated castings, such as but not limited to CrMoV castings. The casting may be a sand casting where the manufactured areas have known problems that can be revealed by inspection with non-destructive testing (NDT). These areas that may be indicated by NDT are generally areas less than 1 / 8 inch in size and may include items referred to as incompletes, damages, blemishes, defects, defects, and the like (hereinafter referred to simply as "NDT indications"). These NDT indications are likely due to casting shrinkage during cooling and thermal tearing (cracks) due to the inflexible nature of the core. As recognized, these cores are usually sand with a binder in order to provide shear strength to the core during positioning with a rigid internal framework which provides a structural lo...

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PUM

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Abstract

A method, with an associated system, for providing a cast component comprises annealing heat treatment to reduce casting stresses; initial machining the cast component; initial nondestructive testing (NDT) the machined cast component to identify NDT indications in the cast component; treating and removing NDT indications from the machined cast component; weld upgrading the treated and removed NDT indications from the machined cast component, the weld upgrading providing stress relief; intermediate nondestructive testing the cast component to identify NDT indications in the weld upgraded cast component; normalizing and temper heat treatment of the cast component; second intermediate nondestructive testing the cast component to identify NDT indications in the cast component; further treating and removing NDT indications from the cast component; post-normalization and temper weld upgrading the treated and removed NDT indications providing stress relief; and final nondestructive testing the cast component to identify NDT indications in the cast component.

Description

technical field [0001] The present invention generally relates to a strengthening and heat treatment process (or method) and related systems. In particular, the present invention generally relates to strengthening and heat treatment processes and related systems for castings that can be formed with defects or NDT (non-destructive testing) indications. Background technique [0002] Casting parts such as, but not limited to, large sand castings (eg, in the 5-35 ton range in the finished machined state) has some persistent problems with manufacturing limitations. These defects include cracks, porosity and casting shrinkage that develops during cooling and hot tearing due to the non-compliant nature of the core. For example, sand casting of CrMoV for turbine casings of either gas or steam turbines has recognized problems with manufacturing defects that can be attributed to casting shrinkage during cooling and due to the non-compliant nature of the cores. The thermal tearing (c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00C21D5/00
CPCC21D1/30C21D6/002B23P6/007C21D9/0068B23K2201/001C21D1/28C21D9/0081C21D6/004B23K2101/001
Inventor G·K·布斯R·R·凯罗G·A·克拉姆
Owner GENERAL ELECTRIC CO
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