W A V E F O R M C O N T R O L T E C H N O L O G Y T M
APPLICATION
Making Fillet Welds with Power Wave AC/DC 1000™ System | 2/10 |
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Welding Guide |
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DC welding has almost always been the preferred choice for producing submerged arc welds. Some of these reasons are:
1.Lowest capital cost for equipment.
2.Greater arc stability than with AC.
3.Virtual elimination of arc striking problems.
4.Power issues (single phase vs. three phase balanced power)
While DC negative may offer the highest deposit rate per ampere, it is seldom used for automatic welding that must meet stringent code requirements. This is because DC negative is more prone to magnetic arc interference (arc blow), porosity resulting from
contaminants, organic and/or inorganic contaminants in or on the steel and greater potential for slag entrapment because of the larger and “colder” weld puddle. DC negative has always been the method of choice for welding
Understanding Power Wave AC/DC 1000™
To fully understand the potential for possible productivity gains using the Power Wave AC/DC 1000™ system, understanding the major AC components and what they contribute is helpful. The major components consist of:
1.Square wave (vs. a conventional sine wave)
2.Square wave balance
3.Square wave offset
4.Square wave frequency
Figure 1 shows photographs of two 5/16” (8mm) horizontal fillet welds1. One is made using a good DC+ procedure and one using a square wave 25% balanced,
DC+ |
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| AC/DC |
527 Amps |
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| 520 Amps |
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| Figure 1 | ||
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40% faster travel speeds by using Power Wave AC/DC 1000™ Square Wave procedures over DC+ procedures.
1These welds comply with the geometry requirements for leg and throat dimensions of all AWS codes.
T h e | f u t u r e | o f | w e l d i n g | i s | h e r e . | ® |
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