Hardfacing Metal Articles via Segmented Welding Paths
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Solution Overview
Problem
Current hardfacing methods for metal articles, such as manual arc welding, laser cladding, and HVOF thermal spray, are prone to cracking and are costly, and none can effectively close holes in a single process while maintaining adequate joint quality.
Innovation Solution
A method involving multiple passes of a metal composition applied along specific paths to form a hardfacing perimeter and fill it, using additive welding techniques like consumable electrode welding, which reduces cracking and processing costs, and allows for efficient hole closure without preheating or post-treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual arc welding is used for hardfacing, then cost is reduced and application is facile, but cracking susceptibility increases and weld quality becomes variable
Solution Approach 1:
The hardfacing process is divided into multiple sequential passes (first pass, second pass, third pass) applied along different paths. This segmentation allows each pass to be optimized independently, with subsequent passes building upon previous ones to create a more reliable hardfacing layer that reduces cracking susceptibility while maintaining ease of application.
2Use of energy by moving object
If laser cladding is used for hardfacing, then heat input is reduced, but cost increases and cracking susceptibility remains
Solution Approach 1:
The invention changes the process parameters by using multiple passes with controlled deposition patterns instead of single-pass high-energy methods. This approach reduces the heat input per pass while distributing the thermal load, thereby reducing cracking susceptibility without requiring expensive laser cladding equipment.
3Ease of operation
If HVOF thermal spray is used for hardfacing, then application is facile, but additional processing is required
Solution Approach 1:
The invention merges the hardfacing application with hole closing operations into a single integrated process. By applying metal composition along specific paths that form perimeters and fill interiors, the method simultaneously achieves hardfacing and hole closure without requiring separate processing steps, thereby reducing device complexity while maintaining ease of operation.
4Productivity
If single-pass hardfacing is used, then process speed is high, but holes cannot be closed effectively
Solution Approach 1:
The hardfacing process is segmented into multiple passes with distinct functions: perimeter-forming passes and interior-filling passes. This segmentation enables effective hole closure while maintaining high productivity, as each pass is optimized for its specific purpose rather than attempting to accomplish all functions in a single pass.
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 decreases costs, increases process control and efficiency, and achieves crack-free hardfacing with high hardfacing rates, effectively closing multiple holes in a single process without forming significant cracks or requiring additional heat treatments.
Implementation Method 1
A method for hardfacing a metal article includes applying a first pass of a metal composition to a surface of the metal article along a first application path
Data Source
AI summary
A method for hardfacing a metal article is disclosed including applying a first pass of a metal composition to a surface of the metal article along a first application path, applying a second pass of the metal composition to the surface along a second application path, and applying a third pass of the metal composition to the surface along a third application path between the first application path and the second application path. The first pass and the second pass form a hardfacing perimeter, and the third pass fills in the hardfacing perimeter.