Welding equipment: ZX7-400-3 welding machine is used for root welding; Kumagai ZD-500 multifunctional steel pipeline automatic welding equipment is used for filling and covering.
Welding material: Bole φ3.2 E6010 cellulose electrode is used for root welding; Lincoln E81T8-G φ2.0 flux-cored self-shielded welding wire is used for filling and covering.
Groove cleaning: Before the assembly, the groove should be cleaned first. Use an angle grinder or an electric wire brush to remove oil, rust, water, and other dirt within 25mm of the groove and the front and back edges until the metal luster is completely exposed.
Nozzle group pair: The nozzle group directly affects the root welding quality, and must be carried out strictly according to the welding process parameters. The blunt edge of the groove is controlled within the range of 0.5-2.0mm; the groove gap is strictly controlled at 2.5-3.5mm, the top of the nozzle is 2.5mm, and the bottom of the nozzle is 3.5mm.