Testing your welds !!

[hyperbodger]

Very useful posts! When I first though about building a Roadster I took an evening course in welding and found that I was most comfortable with Tig - maybe because I've done quite a bit of soldering/brazing in the past. I've also done some commercial courses and am booked in for testing end November. Then I discovered that most people use MIG welding and this seems to be what most of the posts cover.
Couple of questions - does anyone have any experience of tig welding a chassis? Any tips would be most welcome! Secondly is it necessary to produce any test pieces or results for the IVA? I've had a reply to a different post saying that it's likely the IVA inspector will look very closely at any visible welds (to be expected), I was wondering if people generally have some form of welding test results to hand.

Thanks