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High-rise buildings have been treated as a modern indicator of the city style. The use of high strength and light-weight of steel structure is currently the mainstream of high-rise building design. The steel structures are different depending on the connection method,can be divided into welding, riveting and bolting. Welding which is the most important connection method used in steel structures.The advantage is to make the structure simple, the province of materials, easy processing, and can be used for automated operations. Only the quality of the welding of the spot welding operations due to welding technology or welding site environmental impact.Resulting in possible defects in the weld will be retained, thus affecting the quality of weld and the safety of steel structures.
Non-destructive inspection techniques can be used without damaging the material and the use of physical or mechanical methods to understand the characteristics of steel quality.
Therefore, the applicability and difference analysis of non-destructive testing of steel structure welds such as visual inspection, magnetic particle testing, liquid penetrant testing, ultrasonic testing and radiographic testing are studied in this study.
Key word：Non-Destructive Testing.
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