Horizontal Axis Welding Torch for Compact Pipe Groove Clearance
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Solution Overview
Problem
Existing automated pipe welding arrangements using welding bugs are cumbersome, take up significant space, and are difficult to maneuver due to the need for vertical torch rotation, which can cause interference with the pipe and other equipment, and may require undesirable extensions of pipe coatings.
Innovation Solution
A welding bug design that allows the torch to rotate horizontally between operating and disengaged positions, enabling a more compact and maneuverable setup, with both rotational and linear movement components, reducing interference and allowing for improved control and simpler maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the welding torch is rotated about a vertical axis to move to a disengaged position, then the torch can be positioned away from the groove, but the welding bug becomes cumbersome and takes up a large amount of space on the pipe circumference
Solution Approach 1:
The patent changes the rotation axis from vertical to horizontal, effectively changing the dimension in which the torch moves to its disengaged position. This dimensional change allows the torch to clear the groove while maintaining a compact welding bug footprint on the pipe circumference.
Solution Approach 2:
Instead of rotating the torch upward (vertical axis) to disengage, the patent inverts the approach by rotating the torch horizontally sideways. This inverted motion achieves the same disengagement goal while avoiding the space-consuming vertical rotation.
2Ease of operation
If the welding torch is rotated about a vertical axis, then the torch can be positioned away from the groove, but the arrangement becomes heavy and difficult to maintain
Solution Approach 1:
The patent inverts the rotation axis orientation from vertical to horizontal, which simplifies the mechanical structure. This inversion reduces the complexity of the positioning mechanism and makes the overall arrangement lighter and easier to maintain.
3Ease of operation
If the welding torch moves to a disengaged position by rotating about a vertical axis, then the torch clears the groove, but the pipe coating cutback needs to be extended which is expensive and may not be feasible
Solution Approach 1:
By changing the torch disengagement motion from vertical rotation to horizontal rotation, the patent achieves the same clearance objective without requiring additional pipe coating removal, thus preserving the coating and avoiding expensive extensions.
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
A welding bug (1) comprising a welding torch (3) for welding in a groove (19). The welding torch (3) is mounted for rotational movement about an axis (21) that is substantially horizontal, relative to the welding bug, (typically tangential to a pipe during use) so that the torch is moveable, during use of the welding bug (1) when arranged to enable the torch to weld in a groove, between (i) an operating position, and (ii) a disengaged position in which the welding torch is positioned away from the groove (19). The welding bug may be less cumbersome and more compact than some known arrangements.