Plasma Arc Welded Flange-Web Beams With Less Material Waste
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Solution Overview
Problem
The existing methods for producing structural beams, such as L-shaped and T-shaped configurations, are costly and time-consuming due to the machining of solid billets, which results in significant material waste.
Innovation Solution
A method involving plasma arc welding (PAW) of workpiece assemblies comprising flanges and webs, where the flanges and webs are positioned to form the desired configurations, constrained against movement, and welded using a PAW torch to generate molten material that joins the components, allowing for the formation of near-net shape parts that can be efficiently machined into beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid billets are machined to produce structural beams, then manufacturing precision can be achieved, but material waste increases significantly and production time increases
Solution Approach 1:
The beam is divided into separate components (flanges and web) that are welded together to form the final structure. This segmentation allows each component to be manufactured separately with minimal material waste, then assembled through welding rather than machining a complete solid billet
Solution Approach 2:
The manufacturing approach changes from subtractive machining to additive welding, fundamentally altering the material removal parameter from high to low. The welded assembly creates a near-net shape that requires minimal additional machining, thus reducing material waste while maintaining precision
2Strength
If solid billets are machined to produce structural beams, then structural integrity can be ensured, but production time increases
Solution Approach 1:
The flanges and web are prepared in advance as separate components and positioned in a fixture before welding. This preliminary positioning and constraint setup enables efficient welding operations to proceed quickly while ensuring proper alignment and structural integrity of the final beam
Solution Approach 2:
The traditional mechanical machining process is replaced with plasma arc welding, which joins components faster than machining can remove material. The welding process creates strong joints that ensure structural integrity while significantly reducing production time
3Loss of substance
If plasma arc welding is used to join flanges and web, then material waste is reduced, but welding precision must be maintained
Solution Approach 1:
A welding fixture serves as an intermediary device that precisely positions and constrains the flanges and web during welding. This fixture ensures accurate alignment and maintains welding precision while enabling the material-efficient welded construction approach
Solution Approach 2:
The plasma arc welding process applies localized heat and molten material precisely at the weld interface between flanges and web. This localized energy application ensures accurate weld joint formation with minimal heat affect zone, maintaining manufacturing precision while reducing overall material waste
4Reliability
If flanges and web are constrained against movement during welding, then weld quality improves, but device complexity increases
Solution Approach 1:
The welding fixture performs multiple functions: it positions flanges and web, constrains movement during welding, and ensures proper alignment. This multi-functional design achieves reliable weld quality without requiring excessively complex specialized devices for each function
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 reduces material waste and production time, providing a cost-effective method for forming structural beams by creating welded assemblies that require minimal additional machining, thus shortening lead times and lowering costs compared to traditional billet machining.
Implementation Method 1
moving a plasma arc welding (PAW) torch, located on the front side of the workpiece assembly, along a lengthwise direction of the interface, while causing a plasma arc to pass through a flange edge portion and the web side surface, and generate molten material that joins the flange to the web
Data Source
AI summary
A method of welding a workpiece assembly includes positioning a flange adjacent to a web to form a workpiece assembly having an interface between a flange edge surface and a web side surface, and in which a web edge portion protrudes beyond a flange front surface on a front side of the workpiece assembly. The method additionally includes constraining the flange and the web against movement, and moving a plasma arc welding (PAW) torch, located on the front side of the workpiece assembly, along a lengthwise direction of the interface, while causing a plasma arc to pass through a flange edge portion and the web side surface, and generate molten material that joins the flange to the web.