the standard test block is the foundation of flaw detection, based on the earliest "dutch test block". after decades of development, domestic industries such as power, petroleum, shipbuilding, steel structures, and cranes have their own industry standards for flaw detection according to their needs, and corresponding standard test blocks have been specified. our company has been involved in the drafting of national testing standards since the 1980s and has participated in the revision of over 20 testing standards. in 2013, participated in the revision of the gb/t11345-2013 "ultrasonic testing technology, testing levels and evaluation for non destructive testing of welds" standard, and designed and produced corresponding standard flaw detection test blocks according to the standard regulations. at the same time, i also participated in the writing and discussion of the ultrasonic part of nb/t 47013 (jb/t 4730) "non destructive testing of pressure equipment", providing a large number of experimental test blocks for the expert group and collecting a lot of data in conjunction with experiments, providing important basis for standard revision. our company has extensive exchanges with colleagues in the international industry and has received visits from friends from germany, the united kingdom, russia, india, japan, south korea, and other countries multiple times. our products are exported to the united states, canada, russia, india, south korea, japan, germany, france, and other countries.
iiw2 test block (v-2 test block) is a standard test block approved by the international welding society. compared with iiw test blocks, v-2 (din54122) has the advantages of being lightweight, easy to carry, and particularly suitable for on-site use. as shown in figures 1-2.
key points for use:
(1) measure the incident point and sensitivity margin of the oblique probe using a circular reflector with a radius of r50mm;
(2) utilize φ the reflection surface of the 5-way hole can be used to measure the refractive range of the oblique probe, which is 45 ° -65 ° and 65 ° -75 °, respectively;
(3) by utilizing multiple longitudinal wave reflections from a bottom surface with a thickness of 12.5mm, the horizontal and vertical linearity of the flaw detector can be measured;
(4) use the two curved surfaces r25 and r50 to calibrate the timeline and zero point.
