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welding power supplies
- Thread starter bonzouk
- Start date
There are two basic types of power supply used for welding: -
Constant current: where the current remains fairly constant and the voltage varies from typically 80v open circuit to 25V when welding. Usually the output from a transformer. It is used for manual welding process such as MMA(SMAW) or TIG(GTAW) etc.
Constant voltage: automatically maintains the arc gap. This is for automatic wire feeds such as MIG/MAG(GMAW) where changes in the wire feed alter the welding current, the welding current is set by the wire feed rate. As the arc gap closes the current reduces. As the arc gap increases the current increases.
A good book is the Lincoln 'welding procedure handbook'. It contains a good section on welding power sources. Its very cheap, and its available from
Regards
John
Constant current: where the current remains fairly constant and the voltage varies from typically 80v open circuit to 25V when welding. Usually the output from a transformer. It is used for manual welding process such as MMA(SMAW) or TIG(GTAW) etc.
Constant voltage: automatically maintains the arc gap. This is for automatic wire feeds such as MIG/MAG(GMAW) where changes in the wire feed alter the welding current, the welding current is set by the wire feed rate. As the arc gap closes the current reduces. As the arc gap increases the current increases.
A good book is the Lincoln 'welding procedure handbook'. It contains a good section on welding power sources. Its very cheap, and its available from
Regards
John
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