A Macro Etch test also known as a cut and etch test is a very valuable teaching tool. Its a destructive test but it can verify settings and technique and since you see the results in a matter of minutes, the puddle is still fresh in your mind. Did it penetrate like you thought? One Cut and Etch ...
Can one Technique work for all positions?
This simple technique basically just traces the front edge of the puddle where the rubber meets the road. But Cut and Etch testing is still one of the best ways to verify your technique and settings
TIG Welding Text books show an optimum torch angle but in the real world, those optimum angles go out the window on odd shaped parts with limited access. Fortunately, torch angle is usually pretty forgiving