... 19 87, 1989; Mlakar et al. 1989). 6-2. Fracture Behavior of Steel Materials a. The operating service temperature of a steel structure has a significant effect on the fracture behavior of ... inspection of welds. The most commonly used frequencies are between 1 and 5 MHz, with sound beams at angles of 0, 45, 60, and 70 degrees. During application of the method, all surfaces of the part ... part to be examined should be free of weld spatter, dirt, grease, oil, paint, and loose scale. Applicable guidance documents include ASTM A435/A435M, ASTM A 577 /A 577 M, ASTM E114, ASTM E164, ASTM...