The simulation welding experiment of X56 pipeline steel under different pressure s such as 0.1, 0.3, 0.5, 0.7 MPa has been done, and the good effect of one-side welding with back formation is acquired through the choice of reasonable welding parameters.是什么意思_The simulation welding experiment of X56 pipeline steel under different pressure s such as 0.1, 0.3, 0.5, 0.7 MPa has been done, and the good effect of one-side welding with back formation is acquired through the choice of reasonable welding parameters.在线翻译_英语_读音_用法_例句