Study on automatic welding technology of single-side welding and double-side forming of large diameter steel

The installation of penstocks in the construction of water conservancy and hydropower projects should be a key link in the quality control of hydropower projects. It is of great significance to the stability and safety of hydropower projects. Based on the construction process requirements of the steel pipe in the tunnel of a water conservancy project in South China, this paper has developed an all-position automatic welding technology of single-sided welding and double-sided forming of the inner circumferential seam of a super large diameter steel pipe after many tests, and analyzed the factors affecting the welding quality. After repeated trials and adjustments of process parameters, a lower welding voltage (small molten pool) and a larger welding current (guaranteed penetration) are used to ensure a certain deposition efficiency, and finally stable welding quality is achieved. It has certain reference significance for the improvement and improvement of the automatic welding technology of single-side welding and double-side forming of large-diameter steel pipes.