Quote:
Originally Posted by Normsthename
If you are using a TIG Welder, make sure the helmet is compatible with it
When I bought my Nexus TIG Welder it would not work with any standard helmets. and like you was getting flashed all the time 
I went thru' about 4 helmets, and kept taking them back to the shop for exchange!
I did some research and found that you needed a special helmet to work with my type of TIG welder.
I bought a Speedglass 9200X (I think....) and it cured the 'fault' completely
Andy
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Its generally the cheaper Helmets that struggle on DC tig.
Nowadays good quality DC tig inverters have a really smooth output, with very little current ripple and its this ripple or electronic noise that the cheaper helmets rely on to know when to switch on/off.
The larger brands of helmets all do versions which are suitable for tig welding.
I have never had a problem with Speedglas I have used the 9000 series a lot and also I now have a Optrel, both very good bits of kit. Don't think you can go far wrong with either of them.