Patent ID: 11969834
Assignee: LINCOLN GLOBAL, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 9:
10. A welding or additive manufacturing power supply, comprising:
output circuitry configured to generate a welding waveform;
a current sensor for measuring a welding current generated by the output circuitry;
a voltage sensor for measuring an output voltage of the welding waveform; and
a controller operatively connected to the output circuitry to control the welding waveform, and operatively connected to the current sensor and the voltage sensor to monitor the welding current and the output voltage and calculate a circuit resistance value from the welding current and the output voltage,
wherein a portion of welding waveform includes a controlled change in current, from a first level to a second level different from the first level, during a short circuit event between a consumable wire electrode and a workpiece, and wherein the controller is configured to calculate a circuit inductance value that includes a variable cable inductance level from at least the controlled change in current, and further calculate a change in resistance of the consumable wire electrode in real time based on the circuit inductance value,
wherein the controller is further configured to generate an alarm based on one or both of the circuit resistance value and the circuit inductance value.