The composition of angle steel can be changed according to different requirements. Due to its good weldability, plastic deformation and mechanical strength, angle steel is widely used in metal components, engineering structure frames and various building structures. However, due to improper processing, the angle steel often has cracks, so how to determine the angle steel surface cracks?
Understand the structural shape of the detection area, analyze the stress of angle steel, determine the specific detection method, through the detection instrument combined with processing technology, make a correct judgment of the crack. The difficulty of angle steel surface crack detection lies in the irregular shape of angle steel edge and excessive arc. When the ultrasonic straight probe is used for detection, the detection direction is single, so it is easy to miss detection. When the oblique probe is used for detection, it is difficult to determine the defect due to the formation of end angle reflection.
The direction of the crack generated by bending is perpendicular to the length direction of the angle steel, and the direction of the crack is parallel to the length direction of the angle steel. The crack is slender and sharp at both ends. Therefore, the crack is generated during the rolling process. After bending, the crack spreads and the crack characteristics are more obvious. If the direction of the crack is perpendicular to the length direction of the angle steel, the crack is produced in the bending process.