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Inspection by penetrating liquid By means of the inspection with penetrating or technical liquid of penetrating dye, discontinuities can be detected as cracks that enter the surface. A liquid dye is attracted by hair action towards a thin crack, that of another way would be invisible.

There are some cause and remedies welding defects : Inclusions Cause:Failure to remove slag, Remedies: Clean surface and previous weld bead Cause:Entrapment of refractory oxides, Remedies: Power wire brush the previous bead

LAMELLAR TEARING. A step like crack that occurs in thick section tee joints and closed corner joints.

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The notch that can result from faulty workmanship or from improper design produces an extremely high stress concentration which prohibits yielding.