Research on stretching flame correction technology of aluminum alloy ship frame skin welding structure

At present,conventional flame correction has shortcomings such as random heating route and low efficiency.The welding seam of the aluminum alloy ship frame skin structure is concentrated and the frame restraint is large.It is difficult to control and eliminate the local convex deformation after welding.In order to improve the conventional orthopedic technology and improve the orthopedic efficiency,the pre-elastic deformation technology is proposed.Using the method of combining numerical simulation and experiment,the orthopedic effect of conventional and pre-elastic orthopedic technology is studied,and the influence of pre-deformation variables and heating path on deformation control of the frame skin structure after welding is simulated.The simulation results show that the technical key to the control of convex deformation lies in the control of the pre-elastic deformation and the setting of the heating route.The experimental verification results show that the pre-elastic deformation technology has a better control effect than conventional orthopedics,can significantly improve the orthopedic efficiency,and provides a new method for deformation control in the shipbuilding industry.

舰船激光-电弧复合焊的应用技术研究

提高船舶焊接技术水平,对缩短舰船建造周期、降低舰船生产成本、提高舰船质量具有非常重要的意义。激光-电弧复合焊是一种非常高效的焊接技术,可以促进舰船高质量、高效率建造。本文介绍激光-电弧复合焊在国内外工程化应用的现状,分析其在舰船建造中的优势,突破了其在工程化应用中的部分关键技术,为激光-电弧复合焊接技术应用于船舶建造领域提供了依据。

船用1561铝合金薄板TIG电弧加热矫正的有限元分析

近年来,TIG电弧加热矫正焊接变形越来越多的应用于船舶生产中。本文采用有限元分析软件对TIG电弧矫正工艺进行研究,对船用1561铝合金TIG热矫正过程进行有限元模拟,分析电弧摆动宽度、电弧摆动速度等对铝合金变形矫正工艺的影响,为实际生产中TIG电弧热矫形的应用提供理论指导。结果表明,为实现有效的电弧矫形效果,产生足够大塑性应变区域的同时,还要保证电弧加热时间和热输入以产生较大的横向塑性应变,进而产生足够大的面外变形,用以抵消船体结构的焊后变形。

船用铝/钢复合结构承载模式优化研究

基于铝-钢复合过渡接头具有拉/剪强度相当的特性,提出了船舶铝/钢复合连接结构拉-剪双承载模式,即将铝-钢过渡接头的承载模式从传统的正向拉伸改变为拉伸与剪切共同作用模式。过渡接头倾斜角度由复合界面处的拉伸强度与剪切强度确定。数值模拟研究表明,拉-剪双承载模式能够将铝/钢复合结构承受拉伸负荷能力提高27%;并经试验验证,该模式将铝/钢复合结构的抗拉应力从256 MPa提高到306 MPa,承载能力提高了20%以上。