Dual-Torch Welding System for Sealed Circular Components
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional welding systems for sealed components with purge holes along the weld seam face issues such as unacceptable weld morphology and rupture due to pressure increases during the welding process, and the use of permanent pressure release holes leads to stress concentration and potential cracking, while single torch systems are inefficient and cause angular distortion.
Innovation Solution
A welding system with a pair of torches positioned in a non-opposing arrangement and a control system that rotates the component and torches relative to each other, allowing for controlled welding with reduced heat input and pressure, minimizing the risk of weld defects and maintaining cylindrical uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dual-torch system is used to weld a sealed component, then welding speed and productivity are improved, but heat input increases causing pressure rise and weld defects
Solution Approach 1:
The welding process is segmented into multiple passes with different heat inputs. The first pass uses higher heat input to establish the weld root, while subsequent passes use reduced heat input to complete the weld without causing excessive pressure buildup or distortion. This segmentation allows the system to achieve both high productivity and good weld quality.
Solution Approach 2:
The dual-torch system implements periodic action by alternating between welding and pausing at strategically located purge holes. The torches weld along the seam, then pause at purge holes that allow pressure equalization. This periodic welding approach maintains productivity while preventing the continuous heat input that would cause pressure rise and weld defects.
2Reliability
If a permanent pressure release hole is incorporated into the sealed component, then weld defects are avoided, but stress concentration and cracking risk increase
Solution Approach 1:
The pressure release function is extracted from the component structure itself and relocated to temporary purge holes that are part of the welding fixture or process system. These purge holes provide pressure equalization only during the welding process, then can be removed or sealed, leaving the component without permanent stress concentration points.
Solution Approach 2:
An intermediary pressure equalization system is introduced during welding, using purge holes in the fixture or temporary openings that allow pressure balance without requiring permanent modifications to the component. This intermediary solution provides the necessary pressure relief during welding while preserving the integrity and strength of the final component.
3Manufacturing precision
If a single torch welding system is used, then heat input and pressure rise are reduced, but welding time increases and angular distortion occurs
Solution Approach 1:
Two torches are merged into a single welding system that operates cooperatively rather than independently. The torches are positioned to weld different portions of the seam simultaneously, but their operations are coordinated through the periodic pausing at purge holes. This merging allows the system to maintain the pressure control benefits of reduced heat input while achieving the productivity of dual-torch operation.
Solution Approach 2:
The dual-torch system implements dynamics by allowing the torches to operate at different stages of the welding process. One torch may be actively welding while the other is positioned for the next pass, or both torches alternate their operation. This dynamic coordination optimizes heat input distribution and welding speed while maintaining pressure control through synchronized pausing at purge holes.
4Productivity
If dual torches are positioned in opposing arrangement, then welding efficiency is improved, but uneven heat distribution and angular distortion increase
Solution Approach 1:
The dual-torch system uses an asymmetric positioning arrangement where the torches are not placed in direct opposition but at asymmetric angles relative to the component axis. This asymmetric positioning creates more uniform heat distribution around the weld seam, preventing the angular distortion that would result from symmetric opposing placement, while still maintaining the productivity benefits of dual-torch operation.
Solution Approach 2:
The torch positioning is optimized for local quality by placing each torch at specific locations that account for heat accumulation patterns. Rather than simple opposing positions, the torches are positioned to create overlapping heat zones that distribute thermal energy more evenly around the circumference, ensuring cylindrical uniformity while maintaining welding efficiency through coordinated operation.
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 the likelihood of weld defects like blow-through and concavity, maintains low pressure differentials, and ensures cylindrical uniformity, avoiding the need for permanent pressure release holes and their associated risks, thus enhancing the reliability and durability of the welded components.
Implementation Method 1
A first aspect the invention provides a welding system comprising: a pair of torches positioned in an other than opposing arrangement to weld a substantially circular component therebetween
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A dual-torch welding system (100) is disclosed. In one embodiment, the welding system (100) includes a pair of torches (102) positioned in an other than opposing arrangement to weld a substantially circular component (104) therebetween, and a means for rotating the substantially circular component (104) and the pair of torches (102) relative to one another, allowing welding of the substantially circular component (104) by the pair of torches (102).