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Welding is a fabrication process used to join materials, usually metals or thermoplastics, together. During welding, the pieces to be joined (the work pieces) are melted at the joining interface and usually a filler material is added to form a pool of molten material (the weld pool) that solidifies to become a strong joint.
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http://uploadboy.me/3pnbekj0doch/Intro to Welding Technology.zip
Intro to Welding Technology
