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Comparison of common types of Weld tracking sensors

Comparison of common types of Weld tracking sensors

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  • Time of issue:2019-05-28
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(Summary description)The welding seam tracking sensor has various forms according to the working principle, among which the more important ones are the direct arc sensor, the indirect contact sensor, the electromagnetic sensor, the ultrasonic wave, the infrared and the photoelectric sensor, etc. The contact sensor rolls or slides along the weld by probing with the probe

Comparison of common types of Weld tracking sensors

(Summary description)The welding seam tracking sensor has various forms according to the working principle, among which the more important ones are the direct arc sensor, the indirect contact sensor, the electromagnetic sensor, the ultrasonic wave, the infrared and the photoelectric sensor, etc. The contact sensor rolls or slides along the weld by probing with the probe

  • Categories:Company news
  • Author:
  • Origin:
  • Time of issue:2019-05-28
  • Views:0
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【 Abstract 】 : Welding seam tracking sensor has various forms according to the working principle, among which the more important is the direct arc sensor, the indirect contact sensor, the electromagnetic sensor, the ultrasonic wave, the infrared and the photoelectric sensor and so on. The contact sensor rolls or slides along the weld with the probe and detects the deviation between the welding gun and the weld by the offset of the probe. The advantages of contact sensor are low cost and easy to realize, but the disadvantages are that the probe is easy to wear and deform, low tracking accuracy, certain groove depth is required for the shape of weld groove, and it is not suitable for the tracking of complex groove weld or high-speed welding. The arc sensor is a common weld heel

The welding seam tracking sensor has various forms according to the working principle, among which the more important ones are the direct arc sensor, the indirect contact sensor, the electromagnetic sensor, the ultrasonic wave, the infrared and the photoelectric sensor, etc.

The contact sensor rolls or slides along the weld with the probe and detects the deviation between the welding gun and the weld by the offset of the probe. The advantages of contact sensor are low cost and easy to realize, but the disadvantages are that the probe is easy to wear and deform, low tracking accuracy, certain groove depth is required for the shape of weld groove, and it is not suitable for the tracking of complex groove weld or high-speed welding.

Arc sensor is a common seam tracking sensor. By the swing of the arc relative to the welding seam, the variation of the distance between the welding torch and the workpiece is calculated directly by using the change of the welding arc parameters, and then the position and shape information of the groove is calculated. The advantage of arc sensor is that it does not need to add additional equipment to welding gun, and the cost is low. Its disadvantage is that it relies heavily on the shape of weld groove and only ADAPTS to some symmetrical groove welds.

Ultrasonic sensor has the characteristics of contactless and low price, and it is also used in weld detection. Ultrasonic sensors scan welds and obtain position information and geometry shape of welds by detecting echo time. However, it also has its defects. Environmental temperature, temperature gradient, noise, protective airflow and other factors will interfere and attenuate the ultrasonic wave, affecting the measurement accuracy of the sensor, which is difficult to meet the requirements of high-precision weld tracking.

Infrared sensor is often used to obtain the dynamic information of molten pool and to control the quality of welding process. The infrared sensor detects the infrared signal of the weld pool and its surrounding area in the welding process and converts the temperature gradient signal into thermal image. According to the symmetry of molten pool temperature field distribution, it can judge whether the arc is on the neutral and offset direction, so as to realize weld seam tracking. However, this method fails to solve the problems of arc interference and temperature field calibration and is limited in practical application.

The photoelectric sensor is a sensor that converts the welding seam light signal into electric signal to get the shape of welding seam position. It can be divided into single point photoelectric sensor based on discrete photoelectric element and visual sensor which can obtain image information of weld groove.

Visual sensor, with its advantages of high sensitivity, high precision, anti-electromagnetic interference, no contact with the workpiece, and abundant weld information, has attracted more and more attention and become a hot spot in the research of weld tracking sensor. In this area, the input research, production and market application has basically entered the forefront of domestic.

At present, the images collected by the visual sensor include basic natural light, arc weld image and structured light image with laser as the active light source. Laser as the active light source has the advantages of high energy, high brightness and good monochromness. Laser structured light vision sensor is considered as a weld tracking sensor with promising development prospects.

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