·Table of Contents
·Methods and Instrumentation

HIC and Steel Cleanliness Inspection

Author:Joachim Staudt, AG der Dillinger Hüttenwerke, D - Dillingen
Co-Author:Ulrich Sauer, Krautkrämer GmbH & Co. oHG, D - Hürth

Requirements for development of the new test system

Structure of the test installation

Description of components

  1. Mechanics
    • max. scan-area:
    600 x 600 mm
    • min. scan index:
    0,1 mm, adjustable in steps of 0,04 mm
    • max. scan speed:
    300 mm/s
    • X, Y-axis:
    Stepper motor control with gear
    • Z-axis:
    manual adjustment
  2. Ultrasonic unit
  3. Data acquisition and evaluation
    For each matrix point the following data is recorded:

    For evaluation the following variants can be displayed:

    The HIC - specific characteristic values CAR, CLR, CTR and CSR are calculated automatically.

    Also the corresponding test protocols are generated automatically.
    (Example fig. 9).

    Fig 7: A-scan 0,5 mm FBH Fig 8: C-Scan of test samples (0.5 mm and 1.0 mm FBH) Fig 9: C-scan of series of samples Fig 10 : Test protocol

    Thus the production accompanying quality control is automised, the test results are available earlier than before. Since the raw data is stored, the samples can be evaluated according to different algorithms and specs, without rescanning!

    A clear indicator for the real importance of these tests and the necessity to automise them, is the number of samples, which had been tested in the past 3 years:

    HIC samples samples for cleanliness test
    1997 11.457 132
    1998 12.955 177
    1999 13.776 389

    This great amount of samples can only be managed and documented within the daily operational routine with an automatic test installation like the presented test system.

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