Welding CNC-Touch sensing

Now, I am planning a CNC welding setup.

In my application, touch sensing with Mig-wire is a must. Now, I tested the continuity between torch tip and earth clamp, it is already a closed circuit inside the welding machine. Then how do touch sensing work? 

Looking for help/ideas.

Anyone already using such setup??

verbotics.com/news/2023-08-24-all-about-touch-sensing/
 

Well, I went through the website.

But, I want to know about the exact hardware configuration. That is not given in the website.

 

forum.linuxcnc.org/show-your-stuff/49100...routines-for-probing

Maybe illustrate your system a little?