Arc Position Control in Welding Using Multi-Coil Magnetic Actuation
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Solution Overview
Problem
Existing arc welding methods struggle to maintain a centered arc during the welding of large welding elements, leading to asymmetrical arc formation and reduced welding quality due to the limitations of coaxial magnetic coils in compensating for material pairings and blowing effects.
Innovation Solution
A method and device that monitor the arc position using optical sensors and electromagnets to actively control and maintain the arc's position, ensuring uniform distribution and desired movement patterns, thereby optimizing the welding process and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a coaxial magnetic coil is used to move the arc, then the welding energy can be distributed over the entire face of the element, but the arc position cannot be precisely controlled and maintained centered during welding of large elements
Solution Approach 1:
The single coaxial magnetic coil is divided into multiple independent magnetic coils arranged around the welding element. Each coil can be controlled independently to generate magnetic fields in specific directions, enabling precise control of arc position while maintaining the benefit of distributed welding energy.
Solution Approach 2:
The magnetic field generation system transitions from a static coaxial coil configuration to a dynamic multi-coil system where the magnetic field strength and direction can be adjusted in real-time. This allows the arc position to be dynamically controlled and maintained centered during welding of large elements.
2Reliability
If the magnetic field strength is increased to counteract blowing effects, then arc stability improves, but asymmetrical arc formation cannot be optimally compensated for large welding elements
Solution Approach 1:
Instead of uniformly increasing magnetic field strength across the entire welding area, the invention applies magnetic field strength variations locally through independently controlled coils. Each coil can be adjusted to compensate for blowing effects in its specific region, maintaining arc stability while preventing asymmetrical arc formation.
Solution Approach 2:
The system incorporates sensors to detect actual arc position and magnetic field conditions, providing feedback to the control system. This enables real-time adjustment of individual coil currents to compensate for blowing effects and maintain symmetrical arc formation, particularly for large welding elements.
3Manufacturing precision
If optical sensors and multiple magnetic coils are used to monitor and control arc position, then welding quality assessment and arc position control are improved, but the device complexity increases
Solution Approach 1:
The optical sensors serve multiple functions: monitoring arc position for quality assessment, providing feedback for real-time arc position control, and detecting welding process parameters. The multi-coil system also performs dual functions of generating the magnetic field for arc movement and acting as a control actuator based on sensor feedback, reducing the need for separate dedicated components.
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 precise control of the arc position, enhancing the quality of the welded joint by compensating for asymmetrical effects and maintaining a consistent arc position, resulting in improved welding efficiency and surface coverage.
Implementation Method 1
a magnetic field generation device (30), which is designed to move the arc along the contact points of the sheets to be welded
Implementation Method 2
welding a welding element (100) to a metallic workpiece (200) by means of an electric arc (60)
Data Source
Figure 1~2b
Figure 3~6b
Figure 7~8bh
AI summary
In a method for welding a welding element (100), in particular a bolt, to a metallic workpiece (200) using an electric arc (60), the position of the electric arc (60) is determined during the welding process by means of a position determination device (5, 10). This makes it possible to control the electric arc during the welding process. This can be used to appropriately direct the electric arc during the welding time.