公开(公告)号：EP1559796A1

公开(公告)日：2005-08-03

申请号：EP03769982.4

申请日：2003-10-29

申请人： NIPPON STEEL CORPORATION

发明人： ISHIKAWA, Tadashi, C/O NIPPON STEEL CORPORATION ,  NAKASHIMA, Kiyotaka, C/O NIPPON STEEL CORPORATION ,  NOSE, Tetsuro, C/O NIPPON STEEL CORPORATION

IPC分类号： C21D7/06 ,  B23K31/00

CPC分类号： C21D7/06 ,  B23K20/10 ,  B23K33/004 ,  B23K2203/04 ,  C21D7/04 ,  C21D9/50 ,  C21D10/00 ,  Y10T29/4578 ,  Y10T29/4583

摘要： 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 1/4 of a thickness t from the surface of the steel plate.

摘要翻译： 在多层焊接接头的改进的热影响部的韧性的方法，圆角焊接接头，以及焊接设置一个通或几个通大热输入的钢板的接头，所做的是，一个方法 的特点在对由一个多层的LastPass的形成的热影响区的表面上的钢板的焊接接头的改进的热影响部的韧性的超声波振动工具焊接的钢板，以影响关节由或 镜头通过超声振动钢球喷丸，从而使晶粒的纵向轴线的平均高达2mm以上从钢板在微观结构毗邻的焊接金属的熔合线（FL）的表面的深度和 在所述热影响区的钢板在基质的厚度t的1/4从钢板的表面的深度在焊接之前通过LastPass的形成在钢板基体的晶粒大小的等价物。