Arc Steering in Weld Joint Using Feedback Control
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Solution Overview
Problem
In arc welding, maintaining proper alignment and position of the torch head with respect to the weld groove is challenging due to misalignment and width variations of the workpieces, leading to suboptimal weld quality and requiring constant manual adjustments, even in automated systems.
Innovation Solution
An automated arc steering system that includes a feedback circuit to monitor the position of the arc and torch head, comparing it with predetermined voltage and current values, and adjusting the position using a steering signal to maintain optimal alignment and arc oscillation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated welding systems are used, then productivity increases, but manufacturing precision deteriorates due to misalignment and width variations in weld grooves
Solution Approach 1:
The system uses feedback from voltage and current sensors to continuously monitor arc characteristics and automatically adjust torch head position and arc oscillation width. This closed-loop control maintains welding precision despite workpiece misalignment by using electrical parameters as feedback signals to correct positional deviations in real-time.
Solution Approach 2:
The system dynamically adjusts both the torch head position and arc oscillation width based on real-time welding conditions. Rather than fixed parameters, the system modifies operational parameters adaptively to compensate for variations in weld groove geometry and workpiece alignment, enabling precision maintenance at high welding speeds.
2Device complexity
If torch head position is fixed, then device complexity is reduced, but manufacturing precision deteriorates due to inability to compensate for workpiece misalignment
Solution Approach 1:
The control system incorporates feedback from voltage and current sensors that monitor arc characteristics. This feedback enables automatic adjustment of torch head position and arc oscillation parameters, maintaining weld quality consistency without requiring complex mechanical positioning systems or manual intervention.
Solution Approach 2:
The system performs self-correction by using its own electrical measurements (voltage and current) to automatically adjust its operational parameters. The welding system monitors its own arc characteristics and uses this information to maintain optimal torch positioning and oscillation, eliminating the need for external measurement devices or complex control mechanisms.
3Manufacturing precision
If manual adjustment is required, then manufacturing precision is maintained, but productivity decreases due to constant operator intervention
Solution Approach 1:
The system automatically monitors arc voltage and current, then self-adjusts torch head position and arc oscillation width without operator intervention. This self-service capability maintains manufacturing precision equivalent to manual adjustment while eliminating the need for constant operator involvement, thereby preserving welding cycle time and productivity.
Solution Approach 2:
The closed-loop control system uses feedback from electrical sensors to automatically correct torch positioning and oscillation parameters. This eliminates the need for manual measurement and adjustment operations, maintaining precision while allowing continuous welding operation without operator intervention.
4Manufacturing precision
If arc oscillation width is increased, then manufacturing precision is improved for varying groove widths, but device complexity increases due to additional control requirements
Solution Approach 1:
The system uses feedback from voltage and current measurements to automatically determine and adjust arc oscillation width. By monitoring electrical parameters that reflect arc position and welding conditions, the system adapts oscillation parameters to match varying groove widths without requiring separate measurement systems or complex control logic.
Solution Approach 2:
The control system uses the same voltage and current sensors for multiple purposes: monitoring arc stability, determining torch position, and adjusting arc oscillation parameters. This multi-functionality allows the system to adapt to varying groove widths using existing electrical measurements, avoiding the need for additional specialized control systems.
Data Source
AI summary
A method of and system for steering an arc and/or torch head in a weld joint is provided. The system includes a torch head that creates an arc in a weld groove formed in at least one workpiece. The system also includes a control unit that includes a feedback system that monitors at least one of a voltage of the arc, a current of the arc, a power output of the torch power supply, and a contact tip to weld distance. The control unit outputs a feedback signal corresponding to the monitoring. The control unit also includes a comparison circuit that compares the feedback signal with at least one predetermined value corresponding to a position of at least one of the arc and the torch head in the weld groove. The control unit further includes an arc steering system that outputs a steering signal based on the comparison.