A Quantitative Evaluation Method of Arc Welding Process Stability Based on Arc Acoustic Spectrum Sample Entropy
A quantitative evaluation, arc sound technology, applied in the direction of arc welding equipment, welding equipment, manufacturing tools, etc., to achieve the effect of stably evaluating performance and widening the difference
Active Publication Date: 2014-10-22
GUANGDONG POLYTECHNIC NORMAL UNIV
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[0006] Judging from the domestic published literature, the research on quantitative evaluation of welding process stability by using sample entropy has not been reported yet.
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[0041] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but the implementation method and the scope of protection of the present invention are not limited thereto.
[0042] figure 1 It is a flowchart of a method for quantitatively evaluating the stability of an arc welding process based on the arc sound spectrum sample entropy of the present invention, specifically comprising the following steps:
[0043] (1) Use the test platform to collect arc sound signals during the welding process;
[0044] (2) Preprocess the collected arc sound data, realize signal-to-noise separation through wavelet packet filtering algorithm, and obtain arc sound signals with obvious characteristic values;
[0045] (3) Generate the spectrogram of the arc sound signal, and simultaneously represent the relationship between time, f...
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The invention discloses a method for quantitatively evaluating the stability of an arc welding process based on sample entropy of an arc sound sound spectrum. According to the method, a denoised arc sound signal is subjected to time frequency visualization, a peak value energy line in a sound spectrum graph is extracted, a peak value energy mean value index is designed by combining a time frequency index, energy sample entropy and energy standard deviation are calculated, and the stability of the welding process is evaluated by the designed arc sound evaluation index, namely the arc sound sound spectrum (ASSP). According to the method, the influence of time, frequency and energy is comprehensively considered, the conception of peak value energy is provided innovatively, the ordering of the peak value energy line in the sound spectrum graph on a time frequency surface is described by the sample entropy, the stability of the arc sound in the welding process is quantized, the influence of process parameters on the arc sound is eliminated by using the designed parameter indexes, the difference of the welding stability degree quantization results is increased, and stable evaluation performance is achieved.
Description
technical field [0001] The invention belongs to the technical field of arc welding, and in particular relates to a quantitative evaluation method for realizing the stability evaluation of the welding process by utilizing the arc sound signal in the arc welding process. Background technique [0002] The arc sound generated during the welding process contains a wealth of welding quality and welding stability information, and the arc sound reflects the stability of the welding process. During pulsed MIG welding, most of the droplets can smoothly transition to the molten pool, but due to changes in voltage and current, unreasonable process specifications or various accidental factors, various forms of droplet transfer will occur, resulting in spatter. The spatter in the welding process not only reduces the welding productivity, affects the stability of the welding process, but also seriously affects the welding quality. When spatter is generated, there will be a popping sound. ...
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IPC IPC(8): B23K9/00B23K9/095
Inventor 姚屏
Owner GUANGDONG POLYTECHNIC NORMAL UNIV