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    Formability and Weld Zone Analysis of Tailor-Welded Blanks for Various Thickness Ratios

    Source: Journal of Engineering Materials and Technology:;2005:;volume( 127 ):;issue: 002::page 179
    Author:
    L. C. Chan
    ,
    S. M. Chan
    ,
    C. H. Cheng
    ,
    T. C. Lee
    DOI: 10.1115/1.1857936
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Cold-rolled steel sheets of thicknesses ranging from 0.5 to 1.0 mm were used to produce tailor-welded blanks (TWBs) with various thickness ratios. In this study, the formability of the TWBs, as well as the mechanical characteristics of the weld zones, were analyzed experimentally under the effects of various thickness ratios of TWBs. The formability of the TWBs was evaluated in terms of three measures—failure mode, forming limit diagram, and minimum major strain, whereas the mechanical characteristics of the weld zones were investigated by tensile testing, metallographic study, and microhardness measurement. In particular, circular TWBs with different radii and cutoff widths were designed where all the welds were located in the center of the blanks and perpendicular to the principal strain direction. Nd:YAG laser butt-welding was used to weld the TWB specimens of different thickness ratios. The experimental findings in this study showed that the higher the thickness ratio of the TWBs, the lower the forming limit curve level, and the lower formability. The minimum major strain was clearly inversely proportional to the thickness ratio of the TWBs. On the other hand, the results of uniaxial tensile tests clearly illustrated that there was no significant difference between the tensile strengths of the TWBs and those of the base metals. The metallographic study demonstrated a difference of grain size in the materials at base metal, heat-affected zones, and fusion zone. The microhardness measurement indicated that the hardness in the fusion zone increased by about 60% of the base metal.
    keyword(s): Base metals , Thickness , Blanks AND Failure ,
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      Formability and Weld Zone Analysis of Tailor-Welded Blanks for Various Thickness Ratios

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    http://yetl.yabesh.ir/yetl1/handle/yetl/131878
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    contributor authorL. C. Chan
    contributor authorS. M. Chan
    contributor authorC. H. Cheng
    contributor authorT. C. Lee
    date accessioned2017-05-09T00:16:17Z
    date available2017-05-09T00:16:17Z
    date copyrightApril, 2005
    date issued2005
    identifier issn0094-4289
    identifier otherJEMTA8-27070#179_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/131878
    description abstractCold-rolled steel sheets of thicknesses ranging from 0.5 to 1.0 mm were used to produce tailor-welded blanks (TWBs) with various thickness ratios. In this study, the formability of the TWBs, as well as the mechanical characteristics of the weld zones, were analyzed experimentally under the effects of various thickness ratios of TWBs. The formability of the TWBs was evaluated in terms of three measures—failure mode, forming limit diagram, and minimum major strain, whereas the mechanical characteristics of the weld zones were investigated by tensile testing, metallographic study, and microhardness measurement. In particular, circular TWBs with different radii and cutoff widths were designed where all the welds were located in the center of the blanks and perpendicular to the principal strain direction. Nd:YAG laser butt-welding was used to weld the TWB specimens of different thickness ratios. The experimental findings in this study showed that the higher the thickness ratio of the TWBs, the lower the forming limit curve level, and the lower formability. The minimum major strain was clearly inversely proportional to the thickness ratio of the TWBs. On the other hand, the results of uniaxial tensile tests clearly illustrated that there was no significant difference between the tensile strengths of the TWBs and those of the base metals. The metallographic study demonstrated a difference of grain size in the materials at base metal, heat-affected zones, and fusion zone. The microhardness measurement indicated that the hardness in the fusion zone increased by about 60% of the base metal.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFormability and Weld Zone Analysis of Tailor-Welded Blanks for Various Thickness Ratios
    typeJournal Paper
    journal volume127
    journal issue2
    journal titleJournal of Engineering Materials and Technology
    identifier doi10.1115/1.1857936
    journal fristpage179
    journal lastpage185
    identifier eissn1528-8889
    keywordsBase metals
    keywordsThickness
    keywordsBlanks AND Failure
    treeJournal of Engineering Materials and Technology:;2005:;volume( 127 ):;issue: 002
    contenttypeFulltext
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