Inconel 713 Part Reconstruction Using DMD to Avoid Heat Cracking
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Solution Overview
Problem
Traditional welding methods for repairing Inconel 713 superalloy parts, such as turbine blades, cause heat-induced damage like cracks and fractures, making them unsuitable for aeronautical applications, as they heat the parts to high temperatures, and existing additive manufacturing techniques do not effectively reconstruct volume without damaging the structural integrity.
Innovation Solution
The process employs Direct Metal Deposition (DMD) technology, where Inconel 713 powder is projected and melted by a Nd:YAG laser to form juxtaposed and superposed cords, reconstructing the wear zone without heat-induced damage, using a neodymium-doped yttrium and aluminum garnet laser with specific power and particle size parameters to ensure accurate and efficient deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional welding methods are used to repair Inconel 713 parts, then material filling can be achieved, but heat-induced damage such as cracks and fractures occurs
Solution Approach 1:
The invention changes the thermal parameters of the welding process by using pulsed laser welding instead of continuous welding, controlling pulse duration and duty cycle to limit heat input and prevent heat-induced damage while still achieving material filling
Solution Approach 2:
The invention applies periodic pulsed laser welding instead of continuous welding, using controlled pulse sequences to deposit material while allowing cooling intervals that prevent heat accumulation and associated damage
2Ease of manufacture
If high temperature welding is applied to Inconel 713, then welding can be achieved, but structural integrity is compromised
Solution Approach 1:
The invention modifies welding parameters by using lower peak temperatures with pulsed laser welding, controlling pulse width and frequency to achieve weld penetration without reaching temperatures that compromise structural integrity
Solution Approach 2:
The invention replaces conventional arc welding with laser beam welding, providing more precise energy control and localized heating that maintains structural integrity while achieving the necessary welding capability
3Area of stationary object
If thick plating layers are deposited to cover significant wear depth, then coverage is achieved, but local temperature rise causes cracks
Solution Approach 1:
The invention segments the plating process into multiple thin layers deposited in sequence, with each layer being sufficiently thin to avoid excessive heat buildup while collectively providing the necessary coverage depth
Solution Approach 2:
The invention uses periodic pulsed welding with controlled duty cycles that allow cooling between pulses, preventing temperature accumulation even as multiple layers are deposited to achieve full coverage
4Quantity of substance
If conventional welding is used for volume reconstruction, then material addition is achieved, but additive manufacturing capabilities are not realized
Solution Approach 1:
The invention combines the material deposition capability of welding with the geometric programming capability of additive manufacturing, creating a hybrid process that achieves both volume reconstruction and complex shape fabrication
Solution Approach 2:
The invention merges conventional welding technology with computer-controlled additive manufacturing systems, integrating the reliability of weld metal deposition with the precision and programmability of digital manufacturing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method maintains the structural integrity of the part, avoids heat damage, and allows for precise reconstruction of complex volumes, improving the quality and speed of the repair process, making it suitable for aeronautical engine parts.
Implementation Method 1
a powder of the Inconel 713 superalloy is projected onto the zone to be reconstructed, then melted by a laser during its deposition to form a plurality of juxtaposed and superposed cords
Data Source
Figure 1~2
Figure 3
AI summary
Method for reconstructing a metal part (100) in Inconel 713 superalloy by metal additive manufacturing, implementing a concentrated energy material deposition technology, known as DMD, in which a powder (10) of the Inconel 713 superalloy is projected onto an area (110) to be reconstructed, then melted by a laser (20) during its deposition to form a plurality of juxtaposed and superimposed beads (30a, 30b), so as to reconstruct said area.