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THEORY OF OPERATION |
DC WELDING OUTPUT
When the polarity switch is placed in either DC position, the AC voltage from the main transformer secondary is applied to the SCR bridge. The SCR bridge and choke circuits are connected in a conventional full wave bridge and filter configuration, resulting in a controlled DC output. Since the choke is in series with the negative leg of the bridge and also in series with the welding load, a filtered DC is applied to the machine output terminals.
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| CHOKE | ELECTRODE |
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| G | G |
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PRIMARY |
| DC | |
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1Ø |
| G G |
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| WORK |
| FIGURE E.5 DC Welding Current Generation. |
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