Multi-Electrode Submerged Arc Welding Stability Control
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Solution Overview
Problem
Submerged arc welding methods face limitations in achieving higher weld speed and deposition rate without compromising weld quality due to the magnetic arc blow effect caused by multiple electrodes, leading to arc deviations and instability in the weld pool.
Innovation Solution
An electrode assembly with sensors monitoring stability parameters, allowing for temporary separation of unstable electrodes from adjacent ones by increasing the distance between them, thereby maintaining weld quality while enhancing weld speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple electrodes are used to increase deposition rate and weld speed, then productivity is improved, but magnetic arc blow effect causes arc deviations and weld quality deterioration
Solution Approach 1:
The electrode assembly allows dynamic adjustment of electrode spacing during the welding process. When magnetic arc blow effect is detected or anticipated, the distance between affected electrodes is increased to mitigate the harmful interactions, while maintaining optimal spacing for high productivity when conditions permit
Solution Approach 2:
The system changes the physical parameter of electrode spacing in response to welding conditions. By adjusting the distance between electrodes, the magnetic field interactions are modified to reduce arc blow effect while maintaining high deposition rates and weld quality
2Stability of the object's composition
If electrode distance is increased to reduce magnetic arc blow effect, then arc stability is improved, but deposition rate and weld speed decrease
Solution Approach 1:
The electrode assembly dynamically adjusts spacing between electrodes based on real-time welding conditions. When arc stability is compromised by magnetic blow, distances are increased temporarily or locally, while maintaining optimal close spacing for high deposition rate when stability is maintained, thus achieving both goals sequentially or spatially
Solution Approach 2:
The electrode assembly is divided into independently controllable electrode units with adjustable spacing. This segmentation allows specific electrode pairs to be spaced further apart to reduce magnetic interaction, while other electrodes maintain optimal spacing for high deposition rate, achieving both arc stability and productivity simultaneously through spatial differentiation
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 allows for previously unattained weld speeds while maintaining desired quality levels by stabilizing the welding process and reducing the impact of magnetic arc blow effects.
Implementation Method 1
During submerged arc welding one or more sequentially arranged welding electrodes melt in arcs
Implementation Method 2
This effect is caused by magnetic fields generated by the current flowing through adjacent electrodes
Implementation Method 3
The 'magnetic arc blow effect' affects an adjacent arc, making it deviate or deflect from the usual and wanted direction
Implementation Method 4
The flux melts in part during the process, thus creating a protecting layer of slag on the weld pool
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to a an electric arc welding method, wherein an electrode assembly (100) comprises at least two fusible continuous electrodes (110, 112, 114, 116, 118) acting on a workpiece (10) for generating a weld pool (12) via electric arcs, wherein the at least two electrodes (110, 112, 114, 116, 118) are arranged in sequential order relative to a welding direction (30) and laterally separated relative to each other, wherein steps are performed of monitoring at least one stability parameter (Stab_par) for each electrode (110, 112, 114, 116, 118) of the electrode assembly (100); determining if one electrode (116) of the electrode assembly (100) violates a stability criterion (Crit); separating at least temporarily the one electrode (116) violating the stability criterion (Crit) from one or more adjacent electrodes (110, 112, 114, 118) when a violation of the stability criterion (Crit) of the one electrode (116) is detected.