Piece Search Using Welding Tip (KRC2)

Hi guys, I'm just learning to use my welding robot.

I want to know how to use a part search function to locate a welding seam. I can enable part search as a function and I can see the input detect if the welding torch is touching a part.
The problem is I'm quite new to Kuka programming and don't know how to incorporate this function into a search routine.

Any help would be great.
Cheers,
Paul.

Skyefire,
Thanks for the response. I don't need a system as sophisticated as touch sense.
My welding kit has a "Piece Search" function allowing it to trigger an output when the welding wire makes contact with the job, this should allow it to identify the correct welding part and load up the matching program.

The problem is that I don't know how to write this into a working piece of code.