DK36落下孔车承载框架侧梁的制造工艺

Manufacturing Process of Bearing Frame Side Beam for DK36 Well-Hole Wagon

为防止HG70E钢承载框架侧梁焊接热影响区产生冷裂和韧性下降,以及侧梁在制造中产生的挠度、旁弯超差等质量问题,通过焊接工艺试验,选用合理的焊接工艺,使焊接接头热影响区的粗晶区为马氏体加少量的BⅢ类下贝氏体组织,致使HG70E焊接接头具有良好的韧性和防止冷裂的性能;在确定梁组装焊接工艺的基础上,对侧梁进行焊接变形和自重作用的挠度进行了仿真计算,得出了侧梁腹板预制上挠度的数据,通过预制侧梁腹板的挠度,利用和控制焊接变形,解决了侧梁制造中产生的挠度、旁弯超差以及侧梁使用过程中,因制造过程中为使挠度达到技术要求,对侧梁腹板和下盖板工作拉应力区进行火焰矫正而产生的上挠度消失等质量问题,为HG70E钢大型变截面箱形梁的制造,提供了一种合理而又可行的工艺方法。

In order to avoid cold crack and tenacity decrease in HAZ,camber and side bending out of tolerance and etc.problems in the manufacture of HG70 E steel bearing frame side beam,it is expected to produce a coarse grained region of Martensite structure with a little content of BⅢ lower Bainite in HAZ using an appropriate welding process by welding process test to make HG70 E welding joints have better tenacity and anti-cold crack performance.Based on the determination of welding process,simulative calculation was made on camber of welding deformation and self gravity,and came out with data of prefabricated side beam web deflection.From this,camber,side bending and camber missing due to flame straightening on tension stress zone of side beam web and bottom cover plate and etc. quality problems were resolved by controlling welding deformation,which provides a reasonable and feasible process method for HG70 E large-scale variable cross-section beam manufacturing.