Someone pointed out that there is a special offer on the Android market for apps today, they are priced at just 10p.
I did a quick search for welding and found the following two free apps (so that’s 20p saved).
The Miller Weld Calculator provides you with the appropriate parameters for setting your current, gas and weld speed dependant on the type of welding, material and thickness.
Welding free from T2R is a phone based welding simulator, it currently supports just arc welding and is basically a test of weld speed and position. It’s an interesting idea but I’m not sure how realistic it is given that you use your finger rather than a welding rod. Once you’ve completed your weld you then get to chip the slag off with a hammer and brush it down with a wire brush. I’m not sure of you get marked down for using the same brush for different metals?