in this paper, the girth welding was carried out after two kinds of oil pipeline steel with different content of v and cr were heat treated by the different specification.
研究了具有不同合金元素钒和铬的两种石油用钢管,在对其经过不同热处理后进行环缝焊接。
the invention is used for automatic air gouging back gouging of the straight welding line and the girth welding line of the large cylindrical welding structure.
本发明用于大型圆筒形焊接结构的直焊缝和环行焊缝自动气刨清根。
two different welding processes were used in the girth welding of the domestic x70pipeline steel.