There are a number of books available on this subject. I suggest you look at one available from the James F. Lincoln Arc Welding Foundation titled. "Metals and How to Weld Them". It covers some very basic theory.
Best regards - Al
gshuma , you might check with local aws chapter , also they may have some good ideas and have someone to make a presentation to help you with your needs . good luck . willie
For just a brief introduction, the AWS Weld Iinspection Technology book does a fair job.