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AC current is commonly used for stick welding. AC stands for alternating current, which means the direction of the flow of electricity changes periodically. This type of current is well-suited for welding as it helps to create a stable arc and allows for better penetration into the metal being welded.

In stick welding, the electrode used in the process requires a current that can easily maintain an arc with the workpiece. AC current is effective in this process because it provides the necessary balance between heat input and electrode melting rate, making it the ideal choice for stick welding.

The other options are not typically used for stick welding:

- DC current, both DC+ and DC-, is also used in welding but is more commonly associated with processes like TIG or MIG welding, where a constant and smooth current flow is required for better control.

- DC+ (direct current electrode positive) has the electrode connected to the positive terminal, which results in deeper penetration and faster welding speeds.

- DC- (direct current electrode negative) has the electrode connected to the negative terminal, which produces a smoother arc and better stability.