Angle steel can be composed of a variety of different stressed members according to different needs. Due to its good weldability, plastic deformation properties and certain mechanical strength in the use of angle steel, it is widely used in metal components, frames of engineering structures and various building structures. However, due to improper processing, the angle steel often produces cracks, so how to determine the surface cracks of the angle steel?
Understand the structural shape of the detection area, analyze the stress of the angle steel, determine the specific detection method, and make a correct judgment on the crack through the combination of testing instruments and processing technology. The difficulty of judging and detecting the cracks on the surface of the angle steel lies in the irregular shape of the edge of the angle steel and the excessive arc, and the detection direction is single when the ultrasonic straight probe is used, and it is easy to miss the detection.
The direction of the crack produced by bending is perpendicular to the length direction of the angle steel, and the crack direction is parallel to the length direction of the angle steel, and the crack is slender and sharp at both ends, so the crack is generated by the rolling process, and the crack spreads after bending, and the crack characteristics are more obvious. If the crack direction is perpendicular to the length of the angle steel, the crack is generated by the bending process.