isoIIW

IW test block (V-1 test block) is also called Dutch test block. It is an international standard test block recommended by the International Institute of Welding (IIW) and the International Organization for Standardization (ISO). Figure 1-1 shows the shapes and dimensions:

Key points of use:

(1) The dynamic range, horizontal linearity and longitudinal wave detection range of the flaw detector can be determined by using the test block thickness of 25mm;

(2) The Angle of refraction of the inclined probe and the sensitivity margin of the longitudinal wave straight probe were measured by φ50 arc and φ1.5 through hole; It can also estimate the size of the blind area of the straight probe and measure the penetration ability of the combination of the instrument and probe.

(3) Use R100mm arc surface to determine the incident point and blind area of the inclined probe, and can correct the time axis ratio and zero;

(4) The longitudinal resolution of the straight probe can be measured by using three notch planes ranging from 85mm, 91mm and 100mm;

(5) Use the right Angle edge of the test block to measure the beam-deflection Angle of the inclined probe.