Self-Shielded Wire-Arc Infill Patterns for Precise 3D Metal Printing

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Solution Overview

Problem

Existing welding infill patterns in metal three-dimensional printing are limited by manual operations, require excessive cleaning, and are constrained by the use of shielding gases, which hinder efficient and precise infill deposition.

Innovation Solution

A self-shielding wire-arc additive manufacturing system with a gantry and computer numerical control system enables precise infill patterns through semi-automatic weld parameters, using flux cored wires that produce their own protective shield, allowing for improved microstructural properties and repeatable human-like infill patterns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If shielding gas is used in wire-arc additive manufacturing, then weld protection is improved, but device complexity and operational constraints increase due to indoor use limitations and excessive cleaning requirements

Engineering Contradiction:

Improveweld protectionVSAvoidcleaning and machining requirements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent removes the external shielding gas system from the wire-arc additive manufacturing process. Instead of using separate gas cylinders, hoses, and delivery systems, the invention extracts the protective function and integrates it directly into the wire electrode through flux cored wires that generate their own protective shield during welding

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The flux cored wire serves itself by generating its own protective shield during the welding process. The flux coating on the wire decomposes to create a protective atmosphere around the arc and molten pool, eliminating the need for external gas protection systems and reducing operational constraints

Inventive Principle:

Principle #25Self-service

2Adaptability or versatility

If manual operations are used for infill patterns, then flexibility in pattern selection is improved, but productivity and precision are reduced due to human limitations and inability to implement machine-optimized patterns

Engineering Contradiction:

Improvepattern selection flexibilityVSAvoidinfill deposition rate

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent replaces manual mechanical welding operations with an automated robotic system controlled by computer numerical control. The robot executes pre-programmed infill patterns with precise positioning and consistent welding parameters, eliminating human limitations while maintaining pattern versatility through software programming

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention uses semi-automatic weld parameters that can be adjusted and optimized for different infill patterns. The system allows modification of welding parameters such as wire feed speed, travel speed, and amperage to match specific pattern requirements, enabling both versatility and high productivity

Inventive Principle:

Principle #35Parameter changes

3Strength

If complex infill patterns are implemented to improve structural integrity, then microstructural properties are enhanced, but build time increases due to excessive material deposition and processing

Engineering Contradiction:

Improvemicrostructural propertiesVSAvoidbuild time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The patent implements optimized infill patterns that use partial material deposition strategically placed to achieve required structural integrity. Instead of filling entire volumes, the system deposits material only where structurally necessary, reducing total build time while maintaining strength through carefully designed pattern geometries

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The infill patterns are segmented into discrete, repeatable units that can be efficiently deposited by the robotic system. The patterns are divided into manageable sections with optimized bead placement that reduces total travel distance and material deposition time while maintaining structural properties

Inventive Principle:

Principle #1Segmentation

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

The system achieves enhanced structural integrity, reduced material usage, and improved build times by providing precise infill patterns and eliminating the need for external shielding gases, thus overcoming limitations of manual operations and gas-dependent technologies.

Implementation Method 1

uses flux cored wires that produce their own protective shield

Methodology Applied

Scientific EffectFlux decomposition:

Implementation Method 2

wire-arc additive manufacturing

Methodology Applied

Scientific EffectElectric arc: Electric Arc

Data Source

PatentUS20250214168A1System and Method for Wire-Arc Additive Manufacturing Without Shielding Gas for Improved Infill Deposition Rate and Production Accuracy

Publication Date: 2025.07.03 GOSSER C F

AI summary

A system and method for wire-arc additive manufacturing to provide a wire-arc additive manufacturing device having a self-shielding system with a gantry and a computer numerical control type control system which enables precise infill patterns not normally obtainable with robotic control, whereby the additive manufacturing system includes a metal deposition device configured to deposit a metal material during an additive manufacturing process, whereby a controller may be operatively coupled to the metal deposition device to command the metal deposition device to deposit an infill pattern based on one or more stored patterns.