DELAYED FRACTURE PREVENTION METHOD FOR STEEL STRUCTURE AND STEEL STRUCTURE MANUFACTURING METHOD

摘要

tensile strength of 600 N / than steel or a steel coupling made of welded steel structures of delay in the fracture prevention method , and subjected to ultrasonic impact treatment of the stress concentration portion strikes the surface of the steel structure in the ultrasonic vibration of the diameter of the front end portion of the terminal 1 to 5 .