TIG welder relay switch connection

edited February 2018 in Repetier-Firmware
Hello everyone. 
I was wondering if anyone may be able to help me with a situation that I am having.

I'm currently working on a project at my college to design a metal three-dimensional printer. I am to use a TIG (tungsten inert gas) welder as my heat source and automate a wire feeder for my "filament". I am currently using a stepper motor as my wire feeder using the extruder port on my Arduino Mega 2560 Ramps 1.4. I have a relay switch to be my on/off effect for my TIG torch but I don't know exactly how to connect the torch to the relay switch to the ramps and power supply. 

Please let me know any further information that I need to provide or any ideas on this matter. 

Thank You. 
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