Welding seam tracking signal processing method for double-pulse MIG welding
A signal processing, double-pulse technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of large current signal variation, hysteresis effect, welding seam tracking failure, etc., to improve efficiency and filtering accuracy, reduce Difficulty and the effect of improving filtering accuracy
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Embodiment 1
[0014] Example 1, see figure 1, the present invention provides a seam tracking signal processing method for double-pulse MIG welding. When the shielding gas is pure argon, in the process of double-pulse MIG welding of aluminum alloy plates, the double-pulse generated by the welding power supply The current is monitored and collected by the Hall sensor in real time. Since the current signal collected by the Hall sensor contains a lot of interference such as short-circuit spikes and noise, and there are a lot of high-frequency interference and low-frequency interference in the current signal waveform, in the process of welding seam tracking Effective welding seam deviation information cannot be extracted, and it needs to be processed effectively through the six-order Chebyshev response band-pass filter (four-stage number), software filtering, and bridge rectification inductance filtering circuit in order to filter the double pulse current signal in sequence The single pulse curr...
Embodiment 2
[0015] Example 2, see figure 2 , the sixth-order Chebyshev response bandpass filter (four stages) is composed of the first stage is a first-order low-pass RC filter circuit with a cut-off frequency of 238.2HZ, and the second stage is a second-order low-pass filter circuit with a cut-off frequency of 271.3HZ Sallen-Key filter circuit, the third stage is a first-order high-pass RC filter circuit with a cut-off frequency of 1.36HZ, and the fourth stage is a band-pass filter composed of a second-order high-pass Sallen-Key filter circuit with a cut-off frequency of 1.19HZ. The gain of each stage is 1, the quality factor Q of the second stage and the fourth stage is 1.139, and the transfer functions of the first-order RC filter circuit and the Sallen-Key filter circuit are as follows:
[0016] (1)
[0017] (2)
[0018] (3)
[0019] (4)
[0020] (5)
[0021] where V 2 represents the output voltage, V 1 Represents the input voltage, w 0 is the angular frequency...
Embodiment 3
[0028] Example 3, see image 3 , current signal waveform I ** After software filtering, the double-pulse current signal is filtered into a single-pulse current signal, thereby further improving the filtering accuracy and reducing the difficulty of extracting weld seam deviation information. Among them, the software filtering part, that is, the program sequentially takes 5 sampling values X 1 、X 2 、X 3 、X 4 、X 5 , use bubble sorting to discard the minimum and maximum values, set Y i =1 / 3(X 2 +X 3 +X 4 ) (i=1, 2, ...), where X i is the value of the input current signal, Y i is the value of the output current signal. Whenever there are 3 Y's i When the value appears, output and judge the program, if |Y 2 -Y 1 |≤(|Y 2 -Y 1 |+|Y 3 -Y 2 |) / 2, output Y 2 , if |Y 2 -Y 1 |>(|Y 2 -Y 1 |+|Y 3 -Y 2 |) / 2 then Y 2 =(Y 2 +Y 3 ) / 2, then output Y 2 . At the same time, the judgment is that if |Y 3 -Y 2 |≤(|Y 2 -Y 1 |+|Y 3 -Y 2 |) / 2, output Y 3 , if |Y 2 -...
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