I have been a welder for over twelve years. I have multiple implants throughout both my left and right hands. I have one xG3 installed on the back side of my left hand, towards the knife edge of my hand. I do not have any sensing magnets in my finger tips at this time. I have NEVER experienced anything ‘bad’ such as movement of the magnet causing a burning feeling. I use MIG, and TIG in AC & DC formats in my shop.
The only time that I have noticed the magnet due to welding is the metal filings will accumulate on my hand just above the magnet.