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Related Flashcards
Cards In This Set
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Arc shielding (2)
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1. Gas2. Flux
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Common shielding gasses
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Argon and helium. Also oxygen and carbon dioxide
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What are we shielding from
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When welding, at high temps metals are very reactive with nitrogen, oxygen and hydrogen
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Flux functions (5)
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1. Provide protective atmosphere for welding2. Stabilize arc3. Reduce splattering4. Adds alloying element5. Controls rate of electrode melt
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Filler metal specified by
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Tensile strength, dirtiness of application, position, deposition rate, appearance, similar composition of base metal
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GMAW Metal transfer methods (4)
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1. Spray transfer2. Globular transfer3. Short circuiting4. Pulse spray
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Spray transfer (3)
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-small droplets-no spatter-high DC current and large electrodes
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Globular transfer (2)
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-globules propelled by arc force-spatter
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Short circuiting (5)
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-good for thin sections -electrode touches and shorts-out of position-incomplete fusion problems
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Pulse spray (2)
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-fluxuating current with time-good penetration and weld pool control
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Types of Joints (5)
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1. Butt joint2. Lap joint3. T joint4. Corner joint5. Edge joint
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Fillet weld
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Corner, lap or tee joint
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Groove
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Used on all except lap joints, but most common with butt. Usually require that edges of parts be shaped into a groove to facilitate weld penetration.
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Plug weld
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For attaching flat plates using holes or slots
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Spot welds/seam welds
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Used for lap joints. Spot is usually resistance welding. Seam is similar but more continuous.
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