EML2322L Welding Facts

EML2322L Welding Facts - EML2322L Design &...

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EML2322L – Design & Manufacturing Laboratory Welding Facts (Summary of Welding Notes) 1. Definition. 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. 2. Common Welding Processes. The most common 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. All three methods use flux or gas to create an inert environment in which the molten pool can solidify without rapidly oxidizing. 3. SMAW. Uses a variable power supply to provide the voltage source and flux covered metal electrode “sticks” to carry the 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 of slag produced as the coating of the electrode burns or vaporizes. Due to the appearance of the electrodes,
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EML2322L Welding Facts - EML2322L Design &...

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