Method for monitoring electric arc length through electric arc voltage signals

An arc voltage and signal monitoring technology, applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve problems affecting the effective energy of arc heat sources, restricting the quality of welding or additive manufacturing, etc., and achieve offline detection and online monitoring, The monitoring results are intuitive and highly operable

Active Publication Date: 2017-06-23
CHONGQING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the processing, the change of the arc length will affect the effective energy of the arc heat source acting on the processing object. Due to the change of the arc length, the arc heat source energy acts on the manufacturing area, and the arc ignition and droplet transfer stability will be extremely changed. Earth constraints welding or additive manufacturing quality improvement

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  • Method for monitoring electric arc length through electric arc voltage signals
  • Method for monitoring electric arc length through electric arc voltage signals
  • Method for monitoring electric arc length through electric arc voltage signals

Examples

Experimental program
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Embodiment 1

[0045] For MIG welding, a 6061 aluminum alloy plate with a thickness of 6mm is used as the substrate, and a 4043 aluminum alloy welding wire with a diameter of 1.2mm is used as the metal welding wire. The shielding gas is high-purity argon with a purity of 99.999%, and the flow rate of the shielding gas is 18L / min. First establish the mathematical model of the arc length: set the arc current output as 118A, the arc voltage output as 20.6V, the arc pulse frequency as 100Hz, and the traveling speed as 30mm / s. The aluminum alloy welding wire used is connected to the positive pole of the power supply, and the substrate is connected to the negative pole of the power supply. Install the base plate and fix it reliably horizontally, and clamp the MIG arc welding torch to the traveling mechanism of the 3D CNC work platform. Orient the MIG torch so that it is perpendicular to the plane of the substrate. Set the walking speed along the x direction to 30mm / s, the walking time to 1.55s, a...

Embodiment 2

[0049] For MIG welding, a 6061 aluminum alloy plate with a thickness of 6mm is used as the substrate, and a 4043 aluminum alloy welding wire with a diameter of 1.2mm is used as the metal welding wire. The shielding gas is high-purity argon with a purity of 99.999%, and the flow rate of the shielding gas is 18L / min. First establish the mathematical model of the arc length: set the arc current output as 146A, the arc voltage output as 22.0V, the arc pulse frequency as 100Hz, and the moving speed of the traveling mechanism as 30mm / s. The aluminum alloy welding wire used is connected to the positive pole of the power supply, and the substrate is connected to the negative pole of the power supply. Install the base plate and fix it reliably horizontally, and clamp the MIG arc welding torch to the traveling mechanism of the 3D CNC work platform. Orient the MIG torch so that it is perpendicular to the plane of the substrate. Set the walking speed along the x direction to 30mm / s, the ...

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Abstract

The invention discloses a method for monitoring the electric arc length through electric arc voltage signals. According to the method for monitoring the electric arc length through the electric arc voltage signals, by means of real-time detection of electric arc voltage signal waveforms in the process of welding or additive manufacturing of an electric arc, an electric arc voltage time-domain signal waveform higher than an electric arc voltage threshold value is extracted, so as to obtain an electric arc voltage time-domain feature waveform, noise elimination is conducted on the electric arc voltage time-domain feature waveform through wavelet analysis, low-frequency components of the electric arc voltage time-domain feature waveform are extracted through wavelet packet analysis, an electric arc voltage signal low-frequency component feature waveform graph is drawn, the electric arc voltage signal low-frequency component feature waveform is substituted into an electric arc length mathematical model, an electric arc length change time-domain waveform in the machining process is obtained through calculation, and the electric arc length at any machining moment in the machining process can be obtained through the electric arc length change time-domain waveform. By the adoption of the method for monitoring the electric arc length through the electric arc voltage signals, offline detection and online monitoring of the electric arc length in the electric arc welding processes of TIG, MIG, MAG, PAW and the like and in the metal material electric arc additive manufacturing process can be achieved.

Description

technical field [0001] The invention relates to a method for monitoring arc length by means of an arc voltage signal, which is not only suitable for monitoring the arc length in TIG, MIG, MAG, PAW and other arc welding processes, but also suitable for arc surfacing welding of metal materials, arc Monitoring of arc length during arc additive manufacturing such as cladding and arc three-dimensional rapid prototyping. Background technique [0002] Using an arc as a heat source, arc welding and arc additive manufacturing of various metal material structures can be performed. Under the situation of rapid development of intelligent manufacturing technology, weld penetration control and arc tracking technology in the process of arc welding and arc additive manufacturing are very meaningful research topics in the field of robotic manufacturing automation. In order to obtain good weld formation quality or additive manufacturing deposit quality, it is necessary to obtain more informa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/10B23K9/073
CPCB23K9/0731B23K9/10
Inventor 罗怡许洁韩静韬朱亮王子琪熊伟梅弢
Owner CHONGQING UNIV OF TECH
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