Abstract
The development of power grid is showing that voltage level is from low to high, networking scale is from small to large, level of automation is from weak to strong.. [1] as the hub of power grid connection between substations, the capacity and automation level of substations is also improving. The large diameter and thick walled tubular busbars of substations have been widely applied. Because of the wide application of tubular aluminum busbar, its welding quality has affected the overall quality of the power plant. Therefore, it is an effective way to improve welding level of power station busbar by scientifically making technological measures and welding codes and carrying out adaptive training for welding operators. In view of the feasibility of the argon arc welding (MIG) welding process and the feasibility of training for the tubular aluminum busbar of UHV power station, the characteristics of the welding technology of tubular aluminum busbar and the technological measures taken by the welding technicians are discussed.
Highlights
Since 12th Five-Year, along with the acceleration of the construction of the national UHV power grid, the scale and schedule of the substation construction have been improved
The arc and molten pool are protected by gas or mixed gas sprayed by the welding gun nozzle
Aluminum and its alloys are relatively high in terms of thermal conductivity, electrical conductivity, linear expansion coefficient and specific heat capacity relative to steel, while density and melting point are much lower than steel
Summary
Since 12th Five-Year, along with the acceleration of the construction of the national UHV power grid, the scale and schedule of the substation construction have been improved. The TIG has been promoted and applied in the welding of substation buses with its high efficiency and high quality. The melting pole argon arc welding is the welding method that produces arc between the continuous wire and the workpiece, and the molten weld metal is connected. The arc and molten pool are protected by gas or mixed gas sprayed by the welding gun nozzle. If argon or helium is used as protective medium, it is called MIG welding. We have carried out related training work for the welding characteristics of the overhead busbar. After several years of research and practice, we have discussed further the training technology of the horizontal fixed welding for the V type groove pipe butt joint on the back of the overhead pipe type and the undetachable backing plate on the back side
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