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CC(formerly VV) power sources, on the other hand, permit the arc voltage to decrease with increases in welding current. The output characteristics of these power sources can range from a “drooping slope,” which provide minor arc voltage changes with weld current variations, to “steep slope” which provide broad voltage changes with only minor current variations. The steeper the slope the more difficult it becomes to maintain arc voltage stability with a constant wire speed open arc process.
To aid in stabilizing the arc voltage when welding on
CCpower sources the
Arc shorting is more difficult to avoid when using a CC power source, and requires a more refined operator technique than when using a CV power source. Improved performance can be obtained o n C C p o w e r s o u r c e a p p l i c a t i o n s w i t h i n t h e following guidelines:
1.Flatter slope power sources with higher arc force (short circuit current) will improve performance over steep slope machines. The steeper the slope, the more critical it is to hold proper electrode stickout to maintain arc stability . Welding techniques, such as weaving, will be more difficult to control. Use the highest output current tap or setting capable of providing the voltage adjustment required for the procedure.
AUTOMATIC PROTECTION SHUTDOWN
The
OVERVOLTAGE SHUTDOWN
If the power source open circuit voltage exceeds about
MOTOR OVERLOAD SHUTDOWN
If excessive motor overload occurs (due to prolonged excessive feeding force, jammed drive rolls or shorted motor leads), the
The shutdown will reset automatically when the gun trigger is released, but will reoccur if the overload situation is not remedied.