FWIW if the member suggestions above don't help much:
Most TIG welders (especially cheap copies of ThreeHungLow knockoffs) may/will cause heavy interference due to the high frequency thing going on to start the arc and or maintain it
As well as the issues OP is having, it's strong enough to make a heart pacemaker crash
just as the unfortunate victim is about to complete the best stack of dimes weld bead \
()()()()()() ever in their life
More suggestions:
Put the TIG welder on a separate circuit, change the layout/position of the cables,
watch a LOT of Youtubes and read the comments, to see how the pros and newbs deal with the problem,
hit on the good welding forums,
or pick a suitable time to TIG weld so it does not cause issues