Good books explaining Tig pipe test ?

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I want to start practiceing for taking the 6G pipe test in steel and/or aluminum.I have been able to find some info on-line about how the steel senario goes, butI have not seen much on whatever the aluminum pipe test looks like.   ( for instance-is it done in one pass or multiple ones like steel ...)I can do the normal garden variety welds like lap, fillet, butt, outside corners.....the normal welds I use building things.  Can yall reccomend a good online resource or even better- a good advanced textbook ?I have been practiceing with 6010 stick because it has been 25 years since I used any !I am thinking of Tig root and then stick overtop but might consider stick/stick later.Everybody that wants to hire a Tig welder seems to want a 6G cert even if it has nothing to do with the kind of products they are making.   So I guess the piece of paper wouldhelp me.   Just missed a job because I didn't have it.Tim