12 Millwork, Forging, and Powder Metallurgy Flashcards
It is often economical to apply NDT to products intended for secondary operations in order to assure
That prior processing defects are not carried forward into secondary processing
Cast ingots that are approximately square cross-sections of large and small size
Blooms and billets
Cast ingots that are rectangular in shape
Slabs
Oxygen torch burning to remove near surface defects caused by ingot or rolling faults is called
Scarfing
Cleaning material in acid baths to attack the scale is known as
Pickling
Process for making steel pipe consists of drawing heated bevel edge skelp through
Welding bell
Method used for manufacturing of seamless tube
Piercing
Tubing operation where a heated cylinder disc is forced through a die by a punch to form a closed bottom cylinder
Cupping
Method used to inspect seamless tubing that can have tears and other crack like defects and irregularities in sizing and wall thickness
Eddy current ET
Methods used to inspect welds in pipe
radiography RT and ultrasonic UT
The extrusion process is used primarily for forming shapes of
Aluminum, copper, lead alloys, and plastic
Method most commonly applied to testing tubular products that are intended for high-pressure applications or high-strength structural applications
Eddy current ET
Operation that exhibits three dimensional control of the shape
Forging
Two types of forging are
Open and closed dies
Forging process used for closing or necking of cylinders and for overall reduction of tubular products
Rotary swaging
Forging dies are constructed so that in the closed position a space is left at the parting line through which the excess metal is forced into this
Gutter
Excess metal that is part of the forging that must be removed in a secondary operation
Flash
NDT method that is useful to reveal internal voids, cracks and inclusions in powdered metal parts
Radiography RT
Mechanism by which solid particles are bonded by application of pressure or heat, or both
Sintering
The application of heat and pressure together, are called
Hot pressing
The application of heat after the particle have been closely packed is known as
Cold pressing
Improves the density, strength, and ductility of powder metallurgical products
Repressing or coining
Inorganic materials, such as oil’s or waxes, maybe infuse into porous metal products for the purpose of lubrication by
Impregnation
Product produced by impregnating high melting temperature metals with low melting temperature metals
Cemented steels
Method used to determine the adequacy of impregnation of metals
Film radiography and fluoroscopy
Cold rolling sheet steel usually begins with the material that
Has been previously hot rolled to dimensions close to the size of the finished product
A process that requires the use of large powerful equipment that forms ductile material into a wide variety of long length uniform cross-sectional shapes best describes
Extrusions
Product form that is generally selected for high-strength and controlled property directionality
Forging
Powdered metallurgy provides two unique advantages in the metal processing. One is the capability to produce shapes and objects of refactory metals that are extremely difficult or impractical to melt; the other is to
Produce metal sheets with controlled porosity
A major purpose of pressing the metal powders during powder metallurgy processing is to
Compact the powders into mechanical and atomic closeness
In the powder metallurgy process, sintering is
In most cases, a fully solid-state process
Powdered metallurgy products cannot
Attain 100% of theoretical density
Defect normally found in extruded pipe is
Seam
Cracks, seams, laps, and laminations are all dicontunuities of
Forgings
