Technology suitable for automatically welding high-strength pressure steel pipes in water tunnel

Abstract

The invention discloses a technology suitable for automatically welding high-strength pressure steel pipes in a water tunnel. The technology includes the following steps that a, one-sided inward grooves are both milled on the ring surfaces to be welded of the two steel pipes; b, the two steel pipes are aligned; c, preheating is conducted on the two sides of a welded joint; d, rails are installed on the inner walls of the steel pipes and further located on the two sides of the welded joint; e, a welding tractor is installed on the rails; f, welding technological parameters and moving trajectories of the welding tractor are confirmed; g, back welding is conducted; h, back welding fusion lines are trimmed; and i, filling and cosmetic welding are carried out. The technology has the beneficialeffects that welded joint formation is attractive, quality is good, molding and low temperature impact toughness are good, and the technology is particularly suitable for high-strength water and electricity steel welding. Meanwhile, the automation process of the welding technology of the pressure steel pipes in the tunnel is greatly accelerated through the technology, the labor intensity of welders is relieved, construction efficiency is high, and the independence on skill levels of the welders is lowered and the social benefits and economic benefits are good.

Description

technical field [0001] The invention relates to a welding process for circular seams of steel pipes, in particular to an automatic welding process for high-strength pressure steel pipes in water delivery tunnels. Background technique [0002] my country's Guangdong, North China and East China are power grids dominated by thermal power. Due to the limitation of regional water resources in these areas, there is very little hydropower available for development, the power grid lacks emergency peak-shaving means, and the peak-shaving contradictions of the power grid are becoming more and more prominent. A consensus has gradually been formed for power plants to solve the peak shaving problem of thermal power as the main power grid. A large number of high-pressure water pipelines are used in the water diversion system of pumped storage power stations. The vigorous development of pumped storage power stations has brought opportunities for the development of automatic welding techno...

AI Technical Summary

Problems solved by technology

[0004] However, due to the poor construction environment for the installation of high-strength steel penstocks in the water delivery tunnel of the pumped storage power station, the construction space is generally 50cm-70cm, the space is narrow, the air humidity is high, and the construction environment is complex and changeable. The commonly used welding method for welds is still Manual arc welding has many problems such as high labor intensity, high repair rate, sharp decrease in the number of skilled welders, and difficulty in quality assurance.

These problems lead to the relatively low welding quality and aesthetics of the welding girth of the steel pipe, and the further lack of plasticity and low temperature impact toughness

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