Suzhou steel structure engineering: characteristics of building steel structure and welding difficulties
1. With novel and unique shapes, various structural systems, complex node structures and many forms of welded joints, the welding technology in component manufacturing and field installation is becoming more and more difficult. For example, the domestic Stadium "bird's nest" steel structure project has a large number of complex truss columns, main trusses and secondary structure welded joints. The welds are crisscrossed and the construction is very difficult.
2. The building height is high and the structural span is large. The seismic performance design has high requirements for the welding quality of the main steel structures. For example, the connection weld between frame beam and column, the connection weld between shear plate and column, the connection weld between beam web and column and the splicing weld of column are all the main parts of the structure. Basically, they are grade I weld with groove penetration. 99%2525 ultrasonic flaw detection requires very high welding quality.
3. There are many varieties and specifications of steels used, and more and more low-alloy high-strength structural steels and large thickness steels are used. With the continuous improvement of steel production technology, cast steel, austenitic stainless steel and composite steel plates are also used more and more. Therefore, it is required to conduct real-time weldability test of new steel types, explore scientific welding process parameters and formulate corresponding welding process measures according to the delivery status of the steel used before on-site construction.
1. With novel and unique shapes, various structural systems, complex node structures and many forms of welded joints, the welding technology in component manufacturing and field installation is becoming more and more difficult. For example, the domestic Stadium "bird's nest" steel structure project has a large number of complex truss columns, main trusses and secondary structure welded joints. The welds are crisscrossed and the construction is very difficult.
2. The building height is high and the structural span is large. The seismic performance design has high requirements for the welding quality of the main steel structures. For example, the connection weld between frame beam and column, the connection weld between shear plate and column, the connection weld between beam web and column and the splicing weld of column are all the main parts of the structure. Basically, they are grade I weld with groove penetration. 99%2525 ultrasonic flaw detection requires very high welding quality.
3. There are many varieties and specifications of steels used, and more and more low-alloy high-strength structural steels and large thickness steels are used. With the continuous improvement of steel production technology, cast steel, austenitic stainless steel and composite steel plates are also used more and more. Therefore, it is required to conduct real-time weldability test of new steel types, explore scientific welding process parameters and formulate corresponding welding process measures according to the delivery status of the steel used before on-site construction.
