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Measurement of the crater depth

crater - It is a shrinkage cavity at the end of the weld seam which is not welded before or during subsequent passes, or it can be a defect in the weld, which is made in the form of recesses in the positions of sharp arc separation at the end of the welding process

  • Set the welding gauge at the zero position
  • Pull the fillet arm 2 out of the main gauge plate 1, matching the mark with a value corresponding to the diameter of the pipe being monitored 
  • Fix and lock the nut position by tightening the fillet arm rivet 6. 
  • Position the welding gauge on the test object. 
  • After rearranging the pivots in the groove located on the right side of the welding gauge, adjust them until they come into contact with the inspected object. 

  • Lock the pivots in this position as shown by the illustration .

˟ the parameter measured during the monitoring process is highlighted in red

  • Adjust the linear member 3 so that the taper gauge 5 is above the point of measurement (at the point of greatest concavity). 
  • Lower the top High-Lo arm 4 so that the taper gauge 5 makes contact with the surface of the test object at the point of measurement. 
  • Take the value of the parameter w from the horizontal scale W, and subsequently the readings of the parameter h – from the vertical scale H
  • Use a calculator to determine the desired parameter h illustrated .

Using a calculator, you can determine the desired value of the from the measured parameters