With the rapid development of electronic technology, especially microelectronics, computer technology, and ultrasonic transducer technology, ultrasonic phased array and TOFD detection technologies have become the trend in ultrasonic flaw detection in recent years.

　　Ultrasonic phased array integrates multiple chips (e.g., 32, 64, 128) in one probe. The excitation time of each chip can be adjusted individually. By controlling parameters such as the acoustic beam axis and focus, a transducer chip array is formed to achieve a full-section scan of the weld.

　　TOFD (Time Of Flight Diffraction) detection is a method that detects defects by relying on the diffracted energy obtained from the "corners" and "endpoints" of internal structures (mainly defects) in the workpiece to be inspected. It uses two wideband, narrow-pulse probes, one for transmitting and one for receiving, arranged symmetrically relative to the weld centerline. The transmitting probe generates a non-focused longitudinal wave beam that is incident on the workpiece at a certain angle. Part of the beam propagates along the near surface and is received by the receiving probe, while another part is received after reflection from the bottom surface. The receiving probe determines the location and height of the defect by receiving the diffracted signal from the tip of the defect and its time difference.

　　Based on phased array technology, A, B, C, and S scans of the weld can be performed. Combined with TOFD detection, more complete three-dimensional imaging information of weld defects can be obtained, showing a typical flaw detection interface. In general, the results of this method can replace radiographic imaging, and the positioning is more accurate. It has been used in the domestic aviation and nuclear industries with good results. In the West-East Gas Pipeline project, ultrasonic phased array detection technology played an important role in the detection of corn cob defects in the connecting welds of oil pipelines. However, due to the high cost of equipment, its widespread application in the inspection of steel structures in buildings is still some time away.

　　In summary, China's colored steel technology for steel structures in buildings has made significant progress and development. With the rapid development of physics, chemistry, metallurgy, materials science, electronics, computer science, and automatic control, and the continuous emergence of new technologies, new materials, new equipment, and new processes, new technologies in the manufacturing and installation of colored steel for building steel structures in China will surely develop faster and better, such as new digital intelligent arc welding inverters, laser colored steel welding and cutting, ultra-high voltage electron beam colored steel welding, colored steel robot systems, and 4C control technology for steel structure production, namely Computer-Aided Design (CAD), Computer-Aided Manufacturing (CAM), Computer-Aided Testing (CAT), and Computer-Aided Engineering (CAE). These new technologies are gradually entering the field of building steel structures, and the colored steel technology level of building steel structures will usher in a new situation.