MFE 201 Lecture Notes - Lecture 9: Micrograph, Destructive Testing, Backhoe
31 Mar 2016
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Issues include: explosion from acetylene or other gases, su ocation from argon, uv light from arc welding (eyes, skin), hot materials. Welding: coalescence of two pieces of metal thorough heat and/or pressure with or without the addition of ller metal. Heat only: arc welding (fusion) ; pressure only: explosive welding ; both: di usion bonding, forge welding. Same material composition, same grain structure, same strength, clean. Di erent composition, di erent structure and strength, presence of a heat a ected zone (haz), contamination. The weld metal composition is going to be a combination of the base materials that are melted (a, b, and c if present) and the welding electrode in consumable electrode processes. Because it can"t be guaranteed that all the base metal comes from the same batch, it is attempted to have the same nominal compositions on the base metal, though this will still lead to some variations.
