Weld Voltage Feedback Over Power Cables for Long-Lead Welding
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Solution Overview
Problem
Welding applications often require long welding power cables, leading to significant voltage drops between the power source and the workpiece, which can result in inaccurate weld voltages and the need for frequent adjustments and additional communication cables.
Innovation Solution
The system uses weld cable communications to enable the welding power supply and wire feeder to communicate through the same cable, allowing for real-time voltage feedback and adjustment of the arc voltage to compensate for cable resistance, thereby maintaining accurate weld voltages without additional communication cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If long welding power cables are used to extend the welding location far from the power source, then the welding system can reach distant workpieces, but significant voltage drops occur leading to inaccurate weld voltages
Solution Approach 1:
The system implements a feedback mechanism where the wire feeder measures the actual arc voltage at the welding location and communicates this information back to the power source. The power source then adjusts its output voltage to compensate for cable resistance, ensuring accurate weld voltages despite long cable lengths. This closed-loop feedback system directly resolves the voltage accuracy problem caused by extended cable distances.
2Measurement precision
If additional communication cables are added to enable voltage feedback and adjustment, then weld voltage accuracy can be maintained, but the system complexity and cable management burden increase
Solution Approach 1:
The welding power cable is designed to perform multiple functions: it serves as both the power transmission conductor and the communication medium for voltage feedback. By integrating communication capabilities into the existing power cable infrastructure, the system eliminates the need for separate communication cables, reducing overall system complexity while maintaining voltage accuracy through feedback control.
Solution Approach 2:
The system merges the power delivery function and communication function into a single cable infrastructure. The power cable that was previously used only for electrical power transmission now also carries communication signals for voltage feedback, combining multiple functions into one unified system and eliminating redundant cabling.
3Ease of operation
If the welder returns to the power source to make adjustments or plug in auxiliary devices, then control changes can be made, but productivity is reduced due to frequent interruptions and travel time
Solution Approach 1:
The wire feeder at the welding location is equipped with voltage measurement and communication capabilities, enabling it to autonomously measure arc voltage and communicate this data to the power source. This self-service capability eliminates the need for the welder to physically return to the power source for routine monitoring and adjustments, maintaining control accessibility while preserving welding continuity and productivity.
Data Source
AI summary
Disclosed example welding-type power supplies include: a power converter; a receiver circuit configured to receive weld voltage feedback information measured at a device remote from the power supply while current is flowing through a weld circuit; and a controller configured to: for an initial weld performed with a weld circuit element: determine an estimated weld circuit resistance value based on a characteristic of the weld circuit element; and control the power converter according to a voltage feedback loop based on the estimated weld circuit resistance value; and for a subsequent weld performed with the weld circuit element: determine a measured weld circuit resistance value based on the weld voltage feedback information; and control the power converter according to a voltage feedback loop based on the measured weld circuit resistance value to regulate a weld voltage at the remote device to the weld voltage setpoint.