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    • 56. 发明授权
    • Method of improvement of toughness of heat affected zone at welded joint of steel plate
    • 改善钢板焊接接头热影响区韧性的方法
    • US07754033B2
    • 2010-07-13
    • US10533607
    • 2003-10-29
    • Tadashi IshikawaKiyotaka NakashimaTetsuro Nose
    • Tadashi IshikawaKiyotaka NakashimaTetsuro Nose
    • C21D7/06
    • C21D7/06B23K20/10B23K33/004B23K2103/04C21D7/04C21D9/50C21D10/00Y10T29/4578Y10T29/4583
    • A method of improvement of toughness of a heat affected zone in a multi-layer welded joint, a fillet welded joint, and a one-pass or several-pass large heat input welded joint of a steel plate is provided, that is, a method of improvement of toughness of a heat affected zone in a welded joint of a steel plate characterized subjecting a surface of a heat affected zone formed by a last pass of a multi-layer welded joint of a steel plate to impacts by an ultrasonic vibration tool or shot peening by ultrasonic vibration steel balls to thereby make an average of longitudinal axis of crystal grains up to a depth of 2 mm or more from the surface of the steel plate in the microstructure adjacent to a fusion line (FL) of a weld metal and a steel plate matrix in said heat affected zone formed by the last pass the equivalent of the crystal grain size of the steel plate matrix before the welding at a depth of ¼ of a thickness t from the surface of the steel plate.
    • 提供了一种提高钢板的多层焊接接头,圆角焊接接头和单程或多通大型热输入焊接接头中的热影响区域的韧性的方法,即, 提高钢板的焊接接头中的热影响区域的韧性的特征在于,通过超声波振动工具对钢板的多层焊接接头的最后通过形成的热影响区域的表面进行冲击, 通过超声波振动钢珠进行喷丸硬化,从而使得在与焊接金属的熔融线(FL)相邻的微结构中,钢板表面的平均纵轴为2mm以上的晶粒的纵轴, 所述热影响区域中的钢板基质在焊接之前由钢板表面以厚度t的深度最后通过相当于钢板基体的晶粒尺寸。