No, Stack Exchange doesn't have its own IRC channel. It has its own chat, where you can participate if you have 20 or more points on any site - even the ones where you don't have an account.
Stack Overflow and Meta Stack Exchange are the exception to this, for them you need 20 points on the site itself. But the association bonus counts for this. If you have 200 points on any Stack Exchange site, you get 100 points on every associated Stack Exchange account. This is called the "association bonus". These 100 points are sufficient for using chat on Stack Overflow and Meta Stack Exchange, too.
Chat rooms have their own rules, defined by their respective room owners and regulars; not every chatroom will be open to your question. Find one where your type of question is allowed.
There is an important difference between Stack Exchange chatrooms and IRC channels: Stack Exchange chatrooms are visible to the public. Not everybody can chat, but the entire world can read. This is something to keep in mind when using Stack Exchange chat.