lecture_15_-_welding,_brazing,_and_soldering_-_chaps_30___31

lecture_15_-_welding,_brazing,_and_soldering_-_chaps_30___31...

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ME 350 – Lecture 15 – Welding, Brazing, Soldering and Adhesive Joining – Chapters 30 & 31
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Welding Classifications welding Solid state welding Soldering and brazing Fusion welding Electrical energy Chemical energy Other processes Non consumable electrode Consumable electrode Shielded metal arc welding Gas metal arc welding Plasma arc welding Laser beam welding Soldering
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Fusion Welding BASE METAL WELD SOLIDIFIED SLAG ARC POOL CORE WIRE ELECTRODE COATING ARC STREAM PENETRATION DEPTH
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Fusion Welding Principles Base metal is melted Filler metal may be added Heat is supplied by various means Oxyacetylene gas Electric Arc Plasma Arc Laser…
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Weld Metal Protection During fusion welding, the molten metal in the weld “puddle” is susceptible to oxidation Must protect weld puddle (arc pool) from the atmosphere Methods Weld Fluxes Inert Gases Vacuum
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Weld Fluxes Typical fluxes – SiO 2 , TiO 2 , FeO, MgO, Al 2 O 3 Produces a gaseous shield to prevent contamination Act as scavengers to reduce oxides Add alloying elements to the weld Influence shape of weld bead during solidification
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Inert Gases Argon, helium, nitrogen, and carbon dioxide Form a protective envelope around the weld area Used in MIG TIG Shield Metal Arc
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Vacuum Produce high-quality welds Used in electron beam welding Nuclear/special metal applications Zr, Hf, Ti Reduces impurities by a factor of 20 versus other methods Expensive and time-consuming
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Main Types of Fusion Welding Oxyacetylene Cutting/Welding Shielded Metal Arc Welding (“Stick” or SMAW) Metal Inert Gas (MIG, or GMAW) Tungsten Inert Gas (TIG)
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OxyFuel (eg Oxyacetylene) Welding Flame formed by burning a mix of acetylene (C 2 H 2 ) and oxygen
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This note was uploaded on 10/03/2011 for the course ME 350 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.

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lecture_15_-_welding,_brazing,_and_soldering_-_chaps_30___31...

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