I posted this over on the Miller site (Ask Andy) but didnt get an answer so I thought Id put the question to the news group:
Now that I have my TIG setup working and Ive messed about a bit I have a question about pointing the electrode. It seems that all texts say the electrode should be pointed. However, they never explain exactly why. So, I did point it checmically and found that the longer and thinner the point the wider the arc. I also tryed not pointing which gave a very narrow arc. I liked this one the best. In fact I could throttle back a bit using a blunt electrode (face 90 degrees to the edge). What I experienced is consistant w/ what the Miller TIG handbook says about pointing. So, why exactly do you need to point the electrode? Not doing so works well. The TIG book says pointing is handy for welding thin sections. However couldnt you get the same result by welding at a lower amperage?