ISO 4992-1-2020 pdf download

ISO 4992-1-2020 pdf download.Steel castings一Ultrasonic testing- Part 1: Steel castings for general purposes. 5.3.3 CheckIng of the ultrasonic test equipment The ultrasonic test equipment shall be checked regularly by the operator in accordance with ISO 2Z2323. 5.3.4 Coupling flild A coupling fluid in accordance with ISO 16810 shall be used The coupling fluid shall wet the test surface to ensure satisfactory sound transmission. The same coupling fluid shall be used for the calibration and all subsequent test operations, NOTE The sound tramsmisnon can be checked by one or more stable back-wall echoes in areas with parallel surfaces 5.4 Preparation of casting surlacca lot testing For the preparation ol casting surfaces for ultrasonic testing. see 150 16810. The casting surbies to be tested shall be such that satistactory coupling with the probe can be achieved With single ‘clement probes, satisfactory coupling can be achieved lithe surfaces correspond at least to the hmil comparator 4 SI or 452 according to ISO 11971 The roughness of any machined surface used far testing shall be RaS 12$ pm For special test techniques, higher surface qualities such is 251 or 252 (see ISO 11971) and Ra so.3 m maybe necessary 5.5 Test procedure 5.5.1 General Because the choice of both the direction of incidence and suitable probes largely depends on the shape of the casting, or on the possible descontinuitles in the casnng or on the possible discantinuines from finishing welding, the applicable test procedure shall be specified by the manufacturer of the casting. If possible, the areas to be tested shall be tested from both sides When testing from one side only. short.range resolving probes shall be used additionally tar the detection of disconlinuitles dose to the surface. Testing with dualelesnent probes is only adequate for wall thicknesses up to SO mm. Additionally. when not otherwise agreed between the purchaser and the manufacturer, for all castings. dual-element normal-beam and/or angle-beam probes shall he used to test the following areas s to a depth 0150 mIn a) critical areas, e.g. fillets, changes In cross-section. areas with external dsIUs b) finishing welds: c) weld preparation areas, as specified in the order; dl spc al rim zones. as peiifld in the ordcr. critical be the pc-rburnidric.c ol the casting. Finishing welds which are deeper than 50 mm shall be subject to supplementary Letting with other suitable angle’beam probes. For angle-beam probes with angles over 60, the sound...