lecture 21 - ME 330 Engineering Materials Lecture 21...

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Lecture 21 Welding Stephen D. Downing Mechanical Science and Engineering © 2001 - 2010 University of Illinois Board of Trustees, All Rights Reserved ME 330 Engineering Materials
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ME 330 - Lecture 21 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 1 of 28 This Lecture . .. ± Terminology ± Metallurgy ± Weldability ± Defects ± Processes ± Variables
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ME 330 - Lecture 21 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 2 of 28 ± Welding, brazing, and soldering are common metal joining processes ± Must form molten metal pool ± Good examples of ± Solidification microstructures and properties ± Heat treatment of metals Metal Joining Processes Weld steel steel Pb-Sn solder Cu Cu
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ME 330 - Lecture 21 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 3 of 28 Typical Weldment
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ME 330 - Lecture 21 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 4 of 28 Types of Joints Weldment = Joint type + Weld type
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ME 330 - Lecture 21 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 5 of 28 Types of Weld
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ME 330 - Lecture 21 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 6 of 28 Types of Groove Welds Square V-Groove Bevel Double V-Groove J-Groove U-Groove Flare Bevel Flare V
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ME 330 - Lecture 21 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 7 of 28 Weld Microstructures Columnar grains Mixed dendrites with grains Equiaxed Recrystallized, no GG Weld Metal Fusion Zone Base Metal Fusion Line HAZ
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ME 330 - Lecture 21 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 8 of 28 Max Temp During Welding Liquidus temperature Solidus temperature Recrystallization temperature Base metal Heat affected zone Fusion zone Cold-Worked Welded Metals
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ME 330 - Lecture 21 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 9 of 28 Max Temp. Liquidus temperature Solidus temperature Pearlite α γ L Structure at max temp High hardenability steel Low hardenability steel Martensite Welded Steel Microstructure Austenite temperature Eutectoid temperature
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ME 330 - Lecture 21 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 10 of 28 Weldability ± Weldability : Ability of a particular alloy to be welded without substantial embrittlement due to martensite formation ± Generally the opposite of hardenability ± Of particular concern for high strength steels!
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lecture 21 - ME 330 Engineering Materials Lecture 21...

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