Steel structure and welding characteristics of Difficulty

Looking at present, China's construction steel structure project status and development trend of more and more with modern architectural style and building a high-tech features, its main features are:

A novel and unique shape, structure, system and many, the node structure is complicated, many forms of welded joints, component production and on-site installation of the welding technology more and more difficult. For example: the National Stadium "Bird's Nest," a large number of steel works complex truss columns, the main truss, sub-structure of welded nodes, crisscross seam construction difficult.

2 building height high, large span structures, seismic performance-based design of major steel welding quality demanding. Such as: frame beam-column connection weld, shear plate and column connection weld, beam-column web connections in the weld and column splice welds, are the main parts of the structure are essentially slope I weld penetration 1, 100% ultrasonic testing, welding quality requirements very high.

Three varieties of the use of steel specifications and more and more and more tend to use high-strength low-alloy structural steel and large thickness of steel, iron and steel production process with the increasing levels, cast steel, austenitic stainless steel, composite steel has also been Yuelai The more applications. Accordingly, I request on-site prior to the construction of steel used for the delivery of state of affairs, a new real-time test of welding steel to explore science and welding process parameters, formulate corresponding measures for the welding process.

4 factory production and on-site installation of links to many different types of cross-operation more difficult on-site installation