![]() Blow holes & Porosity are formed by gas which.Sulphides are present in the original ingot. Nonmetallic inclusions such as Slag, Oxides and.Typical discontinuities found in the ingot are inclusions, blow holes, pipe and segregations. Inherent Discontinuities – relate to the original melting and solidification of the metal in the ingot or inn a casting. Classification of discontinuities by origin It will have on the service of the part or to the requirements of the specification. Remember that discontinuities are not necessary defects.Īny indication that is found by the inspector is called a discontinuity until it can be identified and evaluated as to the effect. Service discontinuities are related to the various service conditions such as stress, corrosion, fatigue and erosion.ĭuring the manufacturing process, many discontinuities that were subsurface will be opened to the surface by machining, grinding, etc.Processing discontinuities are usually related to the various manufacturing process such as machining, forming, extruding, rolling, welding, heat treating and plating.Usually caused by inherent variables such as inadequate feeding, gating, excessive pouring temperature or entrapped gases. Inherent cast discontinuities relates to the melting, casting and solidification of a cast article. Inherent wrought discontinuities relate to the melting and solidification of the original ingot before it is formed into slabs, blooms and billets. Inherent discontinuities are usually formed when the metal is molten.This blog will discuss types of discontinuities that can be evaluated with the ultrasonic testing in NDT method.ĭiscontinuities can be divided into three general categories inherent, processing and service
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