Multi-Wire Additive Manufacturing for High-Rate Weld Pool Deposition
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Solution Overview
Problem
Current 3D metal printing technologies face limitations in printing speed and size due to the physical constraints of the deposition process, which restrict the rate at which metal wires can be fed into the weld pool and energy added, thereby limiting the speed and size of structures that can be printed.
Innovation Solution
The implementation of an additive manufacturing system that uses multiple feed wires, where a second wire is fed into the weld pool at a controlled rate, positioned either ahead of or behind the electrode wire, to optimize energy injection and deposition, utilizing a print controller to determine feed rates based on power and travel speed to achieve superior visual characteristics, uniform deposition, and maximized material deposition rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single feed wire is used to maintain the weld pool, then the weld pool can be kept molten with controlled energy input, but the printing speed and structure size are limited due to physical constraints on feed rate and energy addition
Solution Approach 1:
The single feed wire is segmented into multiple feed wires (first feed wire and second feed wire), each capable of being fed at controlled rates. This segmentation allows the system to overcome the physical constraints of a single wire by distributing the material deposition function across multiple wires, thereby increasing printing speed and structure size capabilities.
Solution Approach 2:
Multiple feed wires are combined to feed material into the same weld pool simultaneously. The first feed wire and second feed wire both deliver material to the weld pool, with their feed rates coordinated to maintain proper pool temperature and composition. This merging of multiple material delivery streams directly increases productivity while managing the complexity through integrated control.
2Productivity
If the feed rate of metal wire into the weld pool is increased to improve printing speed, then productivity increases, but the physical limitations of the deposition process cause defects and reduce manufacturing precision
Solution Approach 1:
The system dynamically adjusts the feed rates of multiple wires based on real-time process conditions. The controller monitors and adjusts the feed rate of each wire independently, allowing the system to optimize material deposition while preventing defects. This dynamic control enables high productivity without sacrificing precision, as the system can respond to changing conditions during the deposition process.
Solution Approach 2:
The system changes multiple parameters simultaneously - the feed rates of multiple wires, the energy input to the weld pool, and the positioning of each wire. By coordinating these parameter changes, the system achieves high deposition rates while maintaining proper material flow and pool characteristics, thereby preventing defects and ensuring manufacturing precision.
3Productivity
If multiple feed wires are used to increase printing speed and material deposition rate, then productivity and structure size improve, but the system complexity and control difficulty increase
Solution Approach 1:
The controller serves multiple functions: it manages the feed rates of all feed wires, coordinates their positioning, monitors weld pool conditions, and adjusts process parameters in real-time. This multi-functional control system, while complex in capability, is implemented as an integrated unit that manages the multiple feed wires efficiently, thereby improving productivity without proportionally increasing overall system complexity.
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 approach enhances printing speed and size capabilities by optimizing energy injection and deposition, resulting in improved material deposition rates and reduced defects, allowing for the production of larger structures more efficiently.
Implementation Method 1
an electric power source configured to provide an input electric power through an electrode wire including Inconel to create a weld pool on a workpiece
Implementation Method 2
Some systems use electricity to add energy to the weld pool. The systems that use electricity can be similar to welding systems that pass an electric current through the feed wire and into the weld pool.
Implementation Method 3
an electrode wire feeder configured to feed the electrode wire into the weld pool at a first feed rate while an electrode end of the electrode wire melts into the weld pool
Implementation Method 4
The electric current adds energy to the weld pool as the feed wire is fed into the weld pool
Data Source
AI summary
A 3D printer can print a structure by depositing material into a weld pool that is moving relative to a workpiece. A multi-wire process may be utilized to increase the deposition rate of the 3D printer. An electrode wire can supply energy to the weld pool while being fed at a first feed rate into the weld pool. A second wire can be fed into the weld pool at a second feed rate to deposit additional material and thereby speed up the overall material deposition rate. All of the energy in the weld pool may be supplied by the electrode wire. Different materials may benefit from different orientations of the electrode wire and the second wire.