MIG/MAG Welding Torch Segmentation for Pipe Bevels
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Solution Overview
Problem
Conventional MIG/MAG welding devices face low productivity and difficulty in centering the welding torch on narrow pipes with pre-machined API bevels, requiring multiple rotation passages and oscillations, which are incompatible with rapid welding speeds and result in high costs and complexity.
Innovation Solution
An MIG/MAG type automatic welding device with a welding head featuring a central torch and two tracking torches positioned offset on either side, allowing for centered penetration passes and lateral passes without oscillation, enabling effective lateral melting and simplified procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional single torch MIG/MAG welding is used on API bevel, then welding can be performed on pre-machined narrow pipes, but productivity decreases due to requiring three rotation passages and slow welding speed on 2nd and 3rd passes
Solution Approach 1:
The welding system is segmented into multiple independent torches (central torch and lateral torches) that can operate simultaneously on different parts of the API bevel, allowing parallel welding operations and eliminating the need for multiple rotation passages
Solution Approach 2:
The solution transitions from a single-point welding approach to a multi-point spatial distribution of torches across the API bevel surface, utilizing the lateral dimension to perform simultaneous welding at different locations and reducing the number of rotational cycles required
2Manufacturing precision
If wide oscillations are used to cover the bevel width, then lateral melting improves, but welding speed decreases making it incompatible with rapid welding requirements
Solution Approach 1:
The lateral melting function is segmented from the central welding torch and assigned to dedicated lateral torches positioned at the edges of the API bevel, allowing the central torch to maintain high welding speed while lateral torches independently ensure proper lateral melting and penetration
Solution Approach 2:
Lateral torches act as intermediary elements that perform the lateral melting function separately from the main welding arc, enabling the central torch to focus on forward progression at high speed while lateral torches ensure proper fusion at the bevel edges
3Ease of operation
If manual centering of the welding torch is required, then operator control is maintained, but operation difficulty increases especially on wide bevel compared to narrow bevel
Solution Approach 1:
The welding system performs automatic centering through tracking mechanisms that follow the API bevel geometry, eliminating the need for manual operator intervention to center the torch, with the system self-adjusting to maintain proper positioning throughout the welding process
Solution Approach 2:
Manual mechanical centering operations are replaced with automated tracking and positioning systems that use sensors and control mechanisms to automatically maintain torch centering on the API bevel, reducing operator workload and improving consistency
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
The device achieves better lateral melting with reduced oscillation, increased flexibility in welding speeds, and precise control of torch distance from the bevel root, enhancing productivity and simplifying the welding process on API bevels.
Implementation Method 1
which brings the current to the end of the electrode wire in order to generate an electric arc and ensure melting of the filler metal
Implementation Method 2
ensure melting of the filler metal
Data Source
AI summary
The present invention concerns an automatic welding device of MIG/MAG type consisting of at least one carriage holding at least one welding head comprising at least one torch (1) guiding a consumable electrode wire along a parting plane (P) between the pipes to be welded, which brings the current to the end of the electrode wire in order to generate an electric arc and ensure melting of the filler metal,The invention consists of the fact that the welding head therefore presents a welding torch (1) intended to be centered in relation to the parting plane (P) to ensure the penetration pass and also bears at least two other so-called tracking welding torches (2, 3), respectively positioned one after the other following the first so-called central welding torch (1) and offset respectively on both sides of the so-called central torch (1) in order to make lateral passes.Application to the welding of metal pipes in order to form pipelines.