Discontinuity, Distortion, Draw mark, Dross, Electrolytic action, Erosion, Excess braze, Fatigue, Fatigue crack

Tabel 2.1 h

DEFFECT	DESCRIPTION
Discontinuity	Is an interruption in the normal physical structure or configuration of a part such as cracks, laps, folds, seams, porosity, etc. A discontinuity may or may not affects the quality of the part.
Distortion	Extensive deformation of the original contour of apart Usual cause is impact of an unwanted object, structural stresses, or excessive localized heating.
Draw mark	Linear, trough-like grooves which result from the action of die imperfections or foreign material on the drawn material
Dross	Linear imperfection or imperfections in the form of the branching or irregular patterns, caused by impurities or oxides in a cast material.
Electrolytic action	Breakdown of surfaces by electrical action between parts made of dissimilar metals. Usual cause is galvanic action between dissimilar metals.
Erosion	Carrying away of material by flow of hot gases, grit, or chemicals. Usual causes are flow of corroding liquids, hot gases, or dirt-laden oil.
Excess braze	Braze material beyond the joint fillet. Sometimes refered to as a run, streak or flash.
Fatigue	The progressive fracture of a material under circled stress loading.
Fatigue crack	Occurs only in parts that have been in service under repeated stress reversals or stress variations. The crack starts at a highly stress area and propagates through the section until failure occurs. A fatigue crack will start more readily where the design or surface condition provides a point of stress concentration, such as fillets, poor surface finish, seams, grinding cracks, and from fastener holes that have poor surface finish and sharp burrs.