Formal:
* Maligayang pagdating sa aming programa. (This is the most formal and literal translation.)
* Masayang pagbati sa ating programa.
Informal:
* Welcome sa programa natin! (This is a more casual way of saying it.)
* Welcome sa programa! (This is the simplest and most common way.)
You can also use a specific greeting depending on the time of day:
* Magandang umaga/hapon/gabi sa ating programa. (Good morning/afternoon/evening to our program.)
Remember, the best choice will depend on the audience and the situation.