Systems and methods for determining a weld torch location

Patent metadata

Field	Value
Publication number	US-2016175976-A1
Application number	US-201414575811-A
Country	US
Kind code	A1
Filing date	Dec 18, 2014
Priority date	Dec 18, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

A welding system having a modulation circuit, a weld torch, and a sensor system is provided. The modulation circuit configured to modulate a welding current with a randomized signal to generate a modulated welding current. The weld torch is configured to receive the modulated welding current and produce a welding arc based on the received modulated welding current. The audio signal is generated when the weld torch produces the welding arc based on the modulated welding current. The sensor system detects the audio signal with one or more sensors, and the one or more sensors provide information regarding the audio signal to a central processing unit of the sensor system. The central processing unit calculates position information for the weld torch based on the information regarding the audio signal.

First claim

1 . A welding system, comprising:
a modulation circuit configured to modulate a welding current with a randomized signal to generate a modulated welding current; a weld torch configured to receive the modulated welding current, wherein the weld torch is configured to produce a welding arc based on the received modulated welding current, and wherein an audio signal is generated when the weld torch produces the welding arc based on the modulated welding current; one or more sensors of a sensor system disposed in a welding region proximate to the weld torch, wherein each sensor of the one or more sensors is configured to detect the audio signal, and the sensor system is configured to provide information regarding the audio signal; and a central processing unit disposed within the sensor system configured to receive the information regarding the audio signal from each sensor of the one or more sensors, wherein the central processing unit is configured to calculate position information for the weld torch based on the information regarding the audio signal received from the one or more sensors.

2 . The welding system of claim 1 , wherein the sensor system comprises processing circuitry configured to provide distance information that is indicative of a distance between the respective sensor and the welding arc as the information regarding the audio signal.

3 . The welding system of claim 1 , wherein the weld torch is configured to receive the welding current and produce the welding arc based on the welding current during unmodulated operation.

4 . The welding system of claim 1 , wherein each of the one or more sensors comprise an ultrasonic sensor.

5 . The welding system of claim 1 , comprising control circuitry disposed within a welding power supply, wherein the modulation circuit is disposed within the control circuitry of the welding power supply.

6 . The welding system of claim 1 , comprising control circuitry disposed within a wire feeder, wherein the modulation circuit is disposed within the control circuitry of the wire feeder.

7 . The welding system of claim 1 , wherein the modulation circuit is configured to generate the modulated welding current based at least in part on a reference pseudo random noise sequence and a unique identifier of a welding power supply or a wire feeder within which the modulation circuit is disposed.

8 . The welding system of claim 7 , wherein the one or more sensors includes processing circuitry configured to determine the unique identifier of the welding power supply or the wire feeder.

9 . The welding system of claim 1 , wherein the modulation circuit is configured to modulate the welding current with a series of randomized signals to generate a series of modulated welding currents during a time period.

10 . The welding system of claim 9 , wherein each modulated welding current of the series of modulated welding currents has unique characteristics based on the random nature of each randomized signal of the series of randomized signals, and wherein a series of unique audio signals are generated when the weld torch produces the welding arc based on the series of modulated welding currents.

11 . The welding system of claim 1 , wherein each of the one or more sensors are disposed at a known or predetermined location within the welding region.

12 . A welding system, comprising:
a weld torch configured to produce a welding arc; a transmitter disposed within the weld torch, wherein the transmitter is configured transmit an audio signal into a welding region; one or more sensors of a sensor system disposed in the welding region proximate to the weld torch, wherein each sensor of the one or more sensors is configured to detect the audio signal and calculate distance information or time delay information based on the detected audio signal; and a central processing unit of the sensor system configured to receive the distance information or the time delay information from each sensor of the one or more sensors, wherein the central processing unit is configured to calculate position information for the weld torch based on the distance information or the time delay information received from the one or more sensors.

13 . The welding system of claim 12 , wherein the transmitter is configured to generate the audio signal based on a randomized signal.

14 . The welding system of claim 12 , wherein the transmitter is configured to generate the audio signal based at least in part on a reference pseudo random noise sequence and a unique identifier of the weld torch.

15 . The welding system of claim 12 , wherein the central processing unit is configured to control a reference time for each of the one or more sensors.

16 . The welding system of claim 15 , wherein each of the one or more sensors is configured to compare the reference time to an arrival time of the audio signal to determine the time delay information.

17 . The welding system of claim 12 , wherein the transmitter and each of the one or more sensors are coupled to a radio.

18 . The welding system of claim 17 , wherein each sensor of the one or more sensors is configured to transmit an interrogation request to the transmitter via the radio, and wherein the transmitter is configured to detect and respond to the interrogation request with a reply signal via the radio.

19 . The welding system of claim 18 , wherein the reply signal comprises a time stamp of a transmission time of the interrogation request.

20 . The welding system of claim 19 , wherein each of the one or more sensors is configured to receive the reply signal and to determine the time delay information based on a comparison of the transmission time of the interrogation request and the arrival time of the reply signal.

21 . A method, comprising:
generating an audio signal from a weld torch disposed within a weld region of a welding system; detecting the audio signal with one or more sensors of a sensor system disposed within the weld region; determining, with each of the one or more sensors, distance information based on the detected audio signal, wherein the distance information comprises a distance between each of the one or more sensors and the weld torch; transmitting the distance information from each of the one or more sensors to a central processing unit of the sensor system; and determining position information of the weld torch within the weld region based on the distance information received from each of the one or more sensors.

22 . The method of claim 21 , comprising generating the audio signal from a transmitter disposed within the weld torch.

23 . The method of claim 21 , comprising generating the audio signal based on a modulated welding current provided by a welding power supply or wire feeder.

Assignees

• Illinois Tool Works

Inventors

• Denis Marc Lee
• Hsu Christopher

Classifications

• B23K9/0956

  using sensing means, e.g. optical · CPC title

• B23K9/126 Primary

  Controlling the spatial relationship between the work and the gas torch (between wire tip and piece B23K9/073) · CPC title

• G01S5/18

  using ultrasonic, sonic or infrasonic waves · CPC title

• B23K9/10

  Other electric circuits therefor; Protective circuits; Remote controls · CPC title

• B23K9/0282

  for welding tube sections · CPC title