Welding with a pacemaker

I would carefully research this and follow the advice of professionals. High power stick welders generate TERRIFIC magnetic fields. You ever in a shop with a welder---and the leads were strung across the floor to a "job?" The magnetic field will make the welding leads dance

Tig/ Mig you are sometimes much closer to the lead, because of the way the cable is made. I would not cheat on this.

The problems TO a pacemeaker are entirely different between a welder and a microwave oven, or a cellphone. With the last two, the danger (if it exists) is that they radiate UHF/ SHF radio waves. The welder generates HF or MF radio waves with the arc, and very high magnetic fields with the current through the leads