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a b c the main energy parameters of the mode and performing the subsequent statistical processing
d e f
Fig. 3. Video frames of melting and transfer of electrode metal into the weld pool at different intervals of the welding
microcycle using a CuBr laser.
In the course of experimental studies, it was found that the operation of the laser creates
interferences that affect the equipment recording the energy parameters. These interference
complicates the analysis of the obtained oscillograms of the arc current and voltage. Typical
oscillograms under interference conditions are shown in Figure 4a.
Fig. 4. Oscillograms of arc current and voltage during laser operation in video mode: a - before processing, b - after image
processing.
To filter the oscillograms of the arc current and voltage from pulsed laser interference, as
well as their statistically processing in order to obtain energy parameters, a special WeldStat
software was developed, which allows:
1) provide reading of files of oscillograms of arc current and voltage recorded by digital
oscilloscopes manufactured by Aktakom and Owon, perform filtering from interference (filtering
result in Figure 4b);
2) carry out visual viewing and scaling of current and voltage oscillograms;
3) perform statistical processing of oscillograms with obtaining data on average current,
average voltage, average amplitude of short-circuit current, average short-circuit duration,
coefficient of variation of current and short-circuit duration, average arc power [8].
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Findings
1. Analysis of the presented video images confirmed the effectiveness of the proposed
technique for researching fast processes accompanying melting and transfer of electrode metal
in gas-shielded arc welding with a consumable electrode.
2. The quality of the images of the contours of the transferred droplets increases in the case
of an increase in the generation of the power of laser coherent radiation while simultaneously
filtering the obtained images using special light filters.
3. Special WeldStat software has been developed, which allows processing the oscillograms of
of the characteristics of heat and mass transfer.
Yu. N. SARAEV, Dr. Tech. Sciences, Associate Professor,
A.G. LUNEV, Cand. tech. sciences;
M.V. TRIGUB, Cand. tech. sciences;
M.V. PEROVSKAYA, Cand. tech. sciences;
(IPPM SB RAS, Tomsk, IOA SB RAS, Tomsk)
Yu. N. Saraev.
i-mash.ru
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