Arc Length Control in Welding: Patent-Based Solution
Here’s PatSnap Eureka !
Summary
Problems
Existing GMAW systems face challenges in maintaining a consistent arc length, which affects energy application and weld quality, as they rely on controlling arc voltage alone, neglecting the complex voltage components across the electrode and workpiece.
Innovation solutions
A method and system that control weld current and determine arc length by sensing changes in weld current and voltage, calculating electrode resistance, and adjusting arc parameters to maintain a desired arc length through a closed-loop control system, accounting for multiple voltage components.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If constant arc voltage control is used, then the control system is simple, but the arc length control precision is insufficient
Why choose this principle:
The system uses feedback control by continuously monitoring weld voltage and weld current, calculating arc length based on these measurements, and adjusting the power supply output to maintain the desired arc length. The control circuitry receives feedback signals from sensors measuring voltage and current, processes this information to determine actual arc length, and compares it with the target arc length to generate corrective control signals.
Principle concept:
If constant arc voltage control is used, then the control system is simple, but the arc length control precision is insufficient
Why choose this principle:
The patent replaces direct physical measurement of arc length with an electrical measurement system. Instead of using mechanical or optical sensors to directly measure the physical distance of the arc, the system uses voltage and current measurements combined with calculated electrode resistance to determine arc length indirectly through the relationship: arc voltage = weld voltage – (weld current × electrode resistance).
Application Domain
Data Source
AI summary:
A method and system that control weld current and determine arc length by sensing changes in weld current and voltage, calculating electrode resistance, and adjusting arc parameters to maintain a desired arc length through a closed-loop control system, accounting for multiple voltage components.
Abstract
A method of controlling a welding system includes controlling a weld current supplied to an electrode at a current ramp rate and determining an arc length based at least in part on the controlled weld current and a changing arc voltage. The arc length includes a distance between the electrode and a workpiece, and the arc voltage includes a voltage between the electrode and the workpiece.