I have my server computer in my tig room less than 10' from a tig welder. I also use that computer to play my music from the hard drive and from internet streams while welding. Have had the same computer in the same place with 2 different tig welders running 8 hours a day for the last 3 years with no ill effects to the computer. I do run a good belkin ups on the computer. I also fix computers as a side job and have had over 30 computers over the last 3 years being built and upgraded in the same room while the welders have been running with no ill effects to them. Monitor is fine no jumpyness. The stereo I pipe the music to the shop from the computer has been working fine with no adverse noise for the last 3 years.
However I did try and run my cnc router with unshielded cables once while welding. Drove the spindle into the table and burnt up the collet. Have not tried it since I installed shielded cables. NO welding and router at the same time. The router has a belkin ups on its computer and is 2 rooms and over 25' away from the welders. At the time i was running Flashcut and gecko stepper drives. Now I have Mach2 and Gecko Stepper drives. Might work better might not.
But all in all my tigs don't effect much. I also have a apartment in the same buliding 12' from the tig welders and watch Sat tv. Use 5 other computers all with no problems while the welders are going.
Groung everything.
Donny
www.whiterivermfg.com