Self-Aligning Isolated Phase Bus Pipe Connections
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Solution Overview
Problem
Current methods for joining large metal pipes in Iso Phase Bus systems face challenges in maintaining precise axial and rotational alignment during welding, leading to inefficiencies and reduced structural integrity due to the need for external backing strips and limitations in transportation and manufacturing processes.
Innovation Solution
A method and system where one end of a cylindrical pipe is flared outwardly or tapered inwardly to create a self-aligning and self-backing joint, allowing for precise alignment and welding without external backing strips, using pinch rollers to modify the pipe ends to fit snugly together, ensuring a continuous and strong weld.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional butt welding methods are used to join large metal pipes, then the welding process can be completed, but precise axial and rotational alignment is difficult to maintain, reducing structural integrity
Solution Approach 1:
The pipe end is preliminarily flared or tapered before the welding operation. This preliminary shaping creates a self-aligning geometry that guides the pipes into precise axial and rotational alignment during assembly, eliminating the need for complex alignment procedures and ensuring consistent positioning before welding begins.
Solution Approach 2:
The flared or tapered portion acts as an intermediary geometric feature between two pipe ends. This intermediate shape facilitates smooth engagement and alignment, serving as a mechanical guide that ensures precise positioning before the final weld is applied, thereby improving both alignment precision and structural integrity.
2Reliability
If external backing strips are used during welding, then weld support is provided, but the device complexity and fabrication time increase
Solution Approach 1:
The pipe end itself is modified to provide the backing function. By flaring or tapering the end, the pipe creates its own welding backing structure, eliminating the need for separate external backing strips. This self-service approach maintains weld support while reducing device complexity and eliminating additional components.
Solution Approach 2:
The backing function is merged with the pipe end geometry itself. Instead of using a separate backing strip component, the flared or tapered portion of the pipe end combines the structural pipe function with the welding backing support function into a single integrated feature, thereby reducing overall device complexity.
3Reliability
If external backing strips are used during welding, then weld support is provided, but fabrication time and manufacturing costs increase
Solution Approach 1:
The pipe end modification creates a self-backing structure that eliminates the need for separate backing strip installation and removal operations. The flared or tapered geometry is formed during pipe fabrication, and the pipe then provides its own welding backing support, significantly reducing fabrication time while maintaining reliable weld support.
Solution Approach 2:
The backing strip component and its associated installation/removal operations are extracted from the welding process. By incorporating the backing function directly into the pipe end geometry through flaring or tapering, the separate backing strip element is eliminated, thereby reducing fabrication steps and overall manufacturing time.
4Manufacturing precision
If pipe ends are modified to create flared or tapered configurations, then alignment and welding quality improve, but additional manufacturing steps are required
Solution Approach 1:
The physical parameters of the pipe end geometry are changed by applying heat and pressure to create flared or tapered configurations. This parameter change transforms the straight pipe end into a self-aligning shape, improving manufacturing precision. The process integrates these changes into existing pipe fabrication workflows, maintaining relative ease of manufacture.
Solution Approach 2:
The flaring or tapering operation is performed as a preliminary step during pipe fabrication, before the pipes are shipped to the welding location. This preliminary action ensures that the alignment-improving geometry is already in place when welding begins, eliminating the need for complex alignment procedures during assembly and improving overall manufacturing efficiency.
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 alignment precision, reduces fabrication time, eliminates the need for external backing strips, and increases the surface area under the weld, resulting in stronger and more efficient connections between pipe segments.
Implementation Method 1
A first end of a pipe is pinched with a pinch roller to provide an inwardly tapered, offset flange
Data Source
AI summary
An end product and system for connecting large aluminum tubular pipe segments into an Isolated Phase Bus comprising reducing the diameter (or increasing the same) of one end of a tubular segment and sliding it into (or over) the untreated end of an adjacent pipe or tubular segment, followed by a tubular and circumferential welding of the same. The outside or inside circumference of the connected segments are uniform from distal to proximal end of the overall length of the connected tubular segments. A structural integral, axially aligned, simplified set of connectable tubular segments allows for a grounded connection between power generators and step transformers. Preferably, the overall diameter change of the necked down flange (or outwardly flared flange) of one tubular segment is less than or only slightly greater than twice the material wall thickness of the tubular segment's initial pre-rolled flat aluminum sheet material.