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Electric welding. Determination of parameters and calculation of the power transformer of the source for semi-automatic welding. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / welding equipment
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In table. 18.1 is given maximum welding circuit inductance for different wire diameters.
Table 18.1. Maximum welding circuit inductance for different wire diameters
In table. 18.2 are given approximate welding modes for thin-sheet products.
Table 18.2. Approximate welding modes for thin sheet products
We need to build a source designed to use welding wire of the most popular diameters of 0,6-1,2 mm. In this case, according to Table. 18.1, the inductance of the welding circuit must not exceed 0,3 mH. According to Table. 18.2, the source must provide a welding current of 60-180 A at an output voltage of 17-23 V.
To obtain a grid of output voltages and currents (Table 18.3), it is supposed to switch the taps of the primary winding of the transformer T1 using switches S1-S5 (Fig. 18.12).
Rice. 18.12. Welding source with stepped current regulation
In table. 18.3 specified voltage at the output of the loaded source. Since, under load, part of the voltage drops on the resistance of the transformer windings, it is difficult to say what open-circuit voltage the sections W2-W6 should have.
Table 18.3. Voltage at the output of the loaded source
In addition to the transformer, the internal resistance of the supply network makes a significant contribution to the voltage drop.
Author: Koryakin-Chernyak S.L.
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