EML2322L-Welding - EML 2322L - MAE Design and Manufacturing...

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EML 2322L -- MAE Design and Manufacturing Laboratory Welding Intro to Welding A weld is made when separate pieces of material to be joined combine and form one piece when heated to a temperature high enough to cause softening or melting. Filler material is typically added to strengthen the joint. Welding is a dependable, efficient and economic method for permanently joining similar metals. In other words, you can weld steel to steel or aluminum to aluminum, but you cannot weld steel to aluminum using traditional welding processes. Welding is used extensively in all sectors or manufacturing, from earth moving equipment to the aerospace industry. Welding Processes The number of different welding processes has grown in recent years. These processes differ greatly in the manner in which heat and pressure (when used) are applied, and in the type of equipment used. There are currently over 50 different types of welding processes; we’ll focus on 3 examples of electric arc welding , which is the most common form of welding. The most popular processes are shielded metal arc welding (SMAW) , gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) . All of these methods employ an electric power supply to create an arc which melts the base metal(s) to form a molten pool. The filler wire is then either added automatically (GMAW) or manually (SMAW & GTAW) and the molten pool is allowed to cool. Finally, all of these methods use some type of flux or gas to create an inert environment in which the molten pool can solidify without oxidizing.
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Shielded Metal Arc Welding (SMAW)
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Shielded Metal Arc Welding (SMAW) SMAW is a welding process that uses a flux covered metal electrode to carry an electrical current. The current forms an arc that jumps a gap from the end of the electrode to the work. The electric arc creates enough heat to melt both the electrode and the base material(s). Molten metal from the electrode travels across the arc to the molten pool of base metal where they mix together. As the arc moves away, the mixture of molten metals solidifies and becomes one piece. The molten pool of metal is surrounded and protected by a fume cloud and a covering
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This note was uploaded on 11/19/2010 for the course EML 2322l taught by Professor Staff during the Spring '08 term at University of Florida.

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EML2322L-Welding - EML 2322L - MAE Design and Manufacturing...

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