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    12th International Conference on Zinc & Zinc Alloy Coated Steel Sheet - GALVATECH 2021

    21–23 Jun 2021 Virtual Conference
    Virtuel Conference
    Europe/Vienna timezone
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    Session

    LME of Resistance Spot Welded Coated Steels: Assessments

    22 Jun 2021, 08:30
    Virtuel Conference

    Virtuel Conference

    Conveners

    LME of Resistance Spot Welded Coated Steels: Assessments

    • Sven Erik Hörnström (SSAB EMEA AB)
    • Sanna Järn (SSAB)

    Presentation materials

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    1. 224. APPLICATION-ORIENTED AVOIDANCE OF LIQUID METAL EMBRITTLEMENT DURING RESISTANCE SPOT WELDING OF ZINC-COATED ADVANCED HIGH STRENGHT STEELS
      Mr Christoph Böhne (Universität Paderborn - LWF)
      22/06/2021, 08:30
      Thermal Joining (Spot Welding) and Liquid Metal Embrittlement
      Oral Presentation

      Resistance spot welding (RSW) is the most common joining process in car body manufacturing and is frequently used to join components made of advanced high strength steels (AHSS). These steels are typically applied with a zinc coating to improve their resistance against corrosion. During the RSW-process the liquefied zinc is reported to infiltrate the grain boundaries of the steel substrate...

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    2. 38. EVALUATION OF INITIATION AND PROPAGATION OF LME CRACKS ON THE GALVANIZED 3G-AHSS USING INTERRUPTED RESISTANCE SPOT-WELDING METHOD
      Anirban Chakraborty (ArcelorMittal)
      22/06/2021, 08:50
      Thermal Joining (Spot Welding) and Liquid Metal Embrittlement
      Oral Presentation

      In zinc coated 3rd Generation advanced high strength steels (3G-AHSS), liquid metal embrittlement (LME) occurs due to liquid zinc or zinc alloy penetration along the grain, grain boundaries and pre-existing cracks of the steel sub-surface area in the presence of critical amount of external tensile stress during resistance spot welding. Due to penetration of liquid metal, cohesion between...

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    3. 173. COMPARATIVE ASSESSMENT OF GI AND GA COATED AHSS LME SENSITIVITY DURING SPOT WELDING
      Mr Jean-Michel Mataigne
      22/06/2021, 09:10
      Thermal Joining (Spot Welding) and Liquid Metal Embrittlement
      Oral Presentation

      Liquid Metal Embrittlement (LME) is a complex phenomenon which may occur during spot welding of zinc-coated Advanced High Strength Steels (AHSS) developed for the Automotive market.

      Zinc or zinc alloy in liquid state penetrates along the steel grain boundaries and may cause, depending on conditions, grains’ decohesion and cracks’ initiation and propagation under given mechanical...

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    4. 202. NUMERICAL MODEL FOR PREDICTING LIQUID METAL CRACKING DURING RESISTANCE SPOT WELDING OF ADVANCED HIGH STRENGTH STEELS
      Konstantin Manuel Prabitz (Materials Center Leoben Forschung GmbH)
      22/06/2021, 09:30
      Thermal Joining (Spot Welding) and Liquid Metal Embrittlement
      Oral Presentation (*)

      Corrosion protected galvanized advanced high strength steels with high ductility (AHSS HD) like the investigated dual phase steel (DP1200HD) tend to show an elevated risk of liquid metal cracking (LMC) during resistance spot welding (RSW). LMC is an intergranular cracking mechanism driven by temperature, tensile stresses, plastic deformation and the presence of liquid zinc. Crack initiation...

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