Might it be possible to create a garment from fabric infused with conductive material which would act like a Faraday Cage to protect a pacemaker or ICD from EMI caused by welding equipment?
Good point about watch however I do not know how similar they areHave you sometimes seen a quartz watch resetting or stop working from welding? Or approaching a high-tension line?
It takes a lot of EMF to knock off modern eletronics circuits.
I have made one SMPS circuit, where a control transformer is used as gate driver. It is very sensible, especially when running higher currents.
Means if I switch on my soldering station, the 12V bulb will go off! The EMF is picked up somewhere in the circuit, I guess in the control transformer.
Modern pacemakers actually are silicon based, not totally different from a quartz watch. I could not imagine any problems due to EMF.
However when I switch on arc welder transformer, said circuit does not become irritated. It has to be EMF with the right frequency. Imagine circuits that would need 50Hz EMF to get into trouble!
Q: Why is it not good practice to weld next to the welding power source?
A: Welding next to the welding power source increases your exposure the EMF due to the field located at the welder.
http://www.lincolnelectric.com/en-us/education-center/welding-safety/pages/misc-welding-safety.aspx