What science is there in welding?

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Presentation transcript:

What science is there in welding? Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

What science is there in welding? US Home security Young PhD student What will you do in the US? I will attend a conference A scientific conference What kind of conference? What subject? Welding What science is there in welding? Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

What science is there in welding? Technology/science High strength – low weight? High strength – low weight – long life? Process–material–design-heat–stresses–deformation–microstructure–properties Mechanisation–control–quality-ergonomics–health&safety Economy Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

Technology/science Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

Technology/science Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

Technology/science Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

Technology/science Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

Technology/science Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

Technology/science Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight Steel (Fe – 0.2%C – 1% Mn – (0.5% Cr – 1% Ni – 0.5% Mo - 0.01 Ti/Nb/V) Yield Strength 200 – 1100 MPa (Stainless steel) (Aluminium) Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight High strength of weld metal???? Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight Microstructure - low and medium strength AF GBF WF Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight Microstructure low – high strength ”Ferrite” Bainite + Martensite 500 MPa 700 MPa 900 MPa Yield Strength (MPa) Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight Toughness vs strength Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight Keehan OK 75.78 0.5 Mn – 7 Ni 2 Mn – 7 Ni Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight - long life fatigue Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight - long life fatigue Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight - long life fatigue Stress concentration Defects Residual stresses Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight - long life fatigue Conventional approaches: Improvement methods Grinding (affects stress concentration, maybe defect occurrence) TIG remelting (affects stress concentration, defect occurrence although not completely and residual stress) Blasting/shot-peening/hammer peening (introduce compressive stress) Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

High strength – low weight - long life fatigue Assuming a smooth weld without defects Would we see: ? Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology

What science is there in welding? A lot Sir But it’s impossible to explain for someone who don’t understand!* *Free translation of reply by Ingemar Stenmark, Swedens most famous downhill ski master, in a TV interview, on the question: Why did you not win today? Lars-Erik Svensson, University West, Engineering Science, Production West, Welding Technology