立向下焊接是手工电弧焊接中一项重大改革,专用焊条为立向下焊条,在国外已广泛应用。结425下焊条是我国近几年来配制成功的立向下焊条,属于酸性纤维素型药皮,可交直流两用。目前我国大多使用φ2.5和φ3.2mm的小直径立向下焊条,焊接低碳钢薄板结构。我厂用集宁厂及我厂生产的φ4、φ5mm的大直径立向下焊条,焊接较厚的钢板和角钢,获得了成功,从而进一步扩大了立向下焊条的 Vertical welding is a major manual arc welding in the reform, special electrode for the vertical electrode, has been widely used in foreign countries. Knot 425 under the electrode is the preparation of our country in recent years, the vertical downward welding electrodes, belonging to acidic cellulose-type coating can be AC ​​and DC. At present, most of our country use φ2.5 and φ3.2mm small diameter vertical down welding, welding low carbon steel sheet structure. I plant with Jining plant and I plant production φ4, φ5mm large diameter vertical down welding, welding thick steel plate and angle, was a success, thus further expanding the up and down the electrode