| LAP
WELD |
TWO
PIECES OF METAL LAPPED, THEN WELDED.
NORMALLY THE EDGES ARE BEVELED OR SCARFED
FOR BETTER WELDING. |
| LEVELING |
FLATTENING ROLLED METAL BY PASSING
IT THROUGH ROLLERS OR BY STRETCHING THE
SHEET. (STRETCHER LEVELING) |
| LIGHT
METALS |
LOW-DENSITY
METALS SUCH AS ALUMINUM, MAGNESIUM, TITANIUM,
BERYLLIUM OR OTHER ALLOYS. |
| LOW
CARBON STEELS |
STEEL
WHICH CONTAINS 0.10 - 0.30 % CARBON,
AND LESS THAN 0.60% MANGANESE. |
| M
B GRADE |
A
STEEL WIRE (.45/.75 C) WIDELY USED FOR
SPRINGS. |
| MACHINABILITY |
THE
RELATIVE EASE OF MACHINING A METAL. |
| MACHINABILITY
INDEX |
STANDARDIZED
TEST OF RELATIVE MACHINABILITY. |
| MACRO-ETCH
TEST |
EVALUATES THE SOUNDNESS AND HOMOGENEITY
OF MATERIAL BY IMMERSING A SAMPLE OF
THE STEEL IN HOT ACID AND EXAMINING THE
ETCHING. |
| MACROSCOPIC |
VISUAL
INSPECTION WITH EITHER THE NAKED EYE
OR UNDER LOW MAGNIFICATION. |
| MAGNETIC-PARTICLE
INSPECTION |
A NONDESTRUCTIVE METHOD OF INSPECTION
TO DETERMINE THE EXISTENCE AND EXTENT
OF POSSIBLE DEFECTS IN FERROMAGNETIC
MATERIALS. |
| MALLEABILITY |
THE
PROPERTY THAT DETERMINES THE EASE OF
DE- FORMING A METAL WHEN THE METAL IS
SUBJECTED TO ROLLING OR HAMMERING. THE
MORE MALLEABLE, THE EASIER TO WORK. |
| MARTENSITE |
A
DISTINCTIVE NEEDLE-LIKE STRUCTURE EXISTING
IN STEEL AS A TRANSITION STAGE IN THE
TRANSFORMATION OF AUSTENITE. IT IS THE
HARDEST CONSTITUENT OF STEEL OF EUTECTOID
COMPOSITE- ITION. IT IS THE CHIEF COMPOSITION
OF HARDENED TOOL STEEL. |
| MATTE
OR MATTE FINISH |
NOT AS SMOOTH AS NORMAL MILL FINISH.
PRODUCED BY ETCHING OR BY ROLLING WITH
ROUGHENED ROLLS. |
| MECHANICAL
PROPERTIES |
THE
PROPERTIES OF A MATERIAL THAT REVEAL
ITS ELASTIC AND INELASTIC BEHAVIOR WHEN
FORCE IS APPLIED, THEREBY INDICATING
ITS SUITABILITY FOR MECHANICAL APPLICATIONS:
FOR EXAMPLE , MODULUS OF ELASTICITY,
TENSILE STRENGTH, ELONGATION, HARDNESS
AND FATIGUE LIMIT. |
| MICROSTRUCTURE |
THE STRUCTURE OF POLISHED AND ETCHED
METALS AS REVEALED BY A MICROSCOPIC MAGNIFICATION
OF 10 DIAMETERS OR MORE. |
| MODULUS
OF ELASTICITY |
A
MEASURE OF THE RIGIDITY OF METAL. ALSO
CALLED THE "COEFFICIENT OF ELASTICITY". |
| METALLOID |
IN
STEEL IT COVERS ELEMENTS COMMONLY PRESENT
IN SIMPLE STEEL.. CARBON, MANGANESE,
PHOSPHORUS, SILICON AND SULFUR. |
| MILL
EDGE |
EDGE
OF SHEET, PLATE OR STRIP WHICH IS UNTRIMMED |
| MILL
FINISH |
AS
PRODUCED BY MILL. NORMALLY DULL. |
| MUNTZ
METAL |
A
REFRACTORY METAL. 60 % COPPER AND 40%
ZINC. USED FOR CASTINGS AND HOT-WORKED
PRODUCTS. HIGH STRENGTH BRASSES ARE DEVELOPED
FROM THIS BY ADDING OTHER ELEMENTS. |
| MUSIC
WIRE |
THIS
IS THE HIGHEST TENSILE (POLISHED) WIRE
MADE. |
| NICKEL
SILVER |
COPPER
BASED ALLOY WITH 20-45% ZINC AND 5-30%
NICKEL. |
| NIOBIUM
(Nb) |
SEE
COLUMBIUM NITRIDING - INTRODUCING NITROGEN
TO HARDEN FERROUS STEEL. |
| NITRIDING
STEEL |
STEEL
WHICH IS PARTICULARLY SUITED FOR THE
NIT- RIDING PROCESS. IT FORMS A VERY
HARD AND ADHERENT SURFACE UPON PROPER
NITRIDING. (.20-.40 C, .90-1.50 Ch, .15-1.0
Mo, .85-1.20 AL) |
| NON-FERROUS
METALS |
METALS
WITH NO OR LITTLE IRON. |
| NORMALIZING |
HEATING
A FERROUS ALLOY TO A SUITABLE TEMP- ATURE
ABOVE THE TRANSFORMATION RANGE AND THEN
COOLING IN AIR TO A TEMPERATURE SUBSTANTIALLY
BELOW TRANSFORMATION RANGE. IT REFINES
THE CRYSTAL STRUCTURE AND RELIEVES STRESS |
| OIL
HARDENING STEEL |
STEEL
WHICH IS HARDENED BY HEAT TREATMENT AND
QUENCHED IN OIL. |
| OLSON
TEST |
A
METHOD OF MEASURING THE DUCTILITY AND
DRAWING PROPERTIES OF STRIP OR SHEET
METAL. THE METAL IS DRAWN OVER A BALL
UNTIL THERE IS A FRACTURE. |
| OPEN
HEARTH FURNACE |
A
TYPE FURNACE WHERE THE FLAME PASSES OVER
THE CHARGE IN THE HEARTH, CAUSING THE
CHARGE TO BE HEATED BOTH BY DIRECT FLAME
AND RADIATION FROM THE LOW ROOF AND SIDEWALLS
OF THE FURNACE. |
| ORANGE
PEEL |
THE
PEBBLE-GRAINED SURFACE WHICH DEVELOPS
IN FORMING OF METALS WITH COURSE GRAINS. |
| OSCILLATED
WOUND |
COIL
WOUND ON A REEL LIKE THREAD, AS OPPOSED
TO RIBBON OR PANCAKE WOUND WHICH IS WOUND
SIMILAR TO A ROLL OF TAPE. |
| ORIENTATION |
HAS
TO DO WITH THE ARRANGEMENT OF CRYSTAL
DIRECTION IN A PLANE. EITHER "PREFERRED " OR
"RANDOM". |
| OXIDATION |
THE
ADDING OF OXYGEN TO A COMPOUND. EXPOSURE
TO ATMOSPHERE SOMETIMES RESULTS IN OXIDATION
OF THE EXPOSED SURFACE RESULTING IN A
STAINING OR DISCOLORATION. INCREASED
TEMPERATURE INCREASES THE OXIDATION. |
| OXIDE |
A
COMPOUND OF OXYGEN WITH ANOTHER ELEMENT. |
| PACK
ROLLING |
ROLLING
TWO OR MORE PIECES OF STEEL TOGETHER.
PACK ROLLING IS OFTEN USED FOR ROLLING
SHEET INTO THIN FOIL. |
| PASSIVATING |
THE
CLEANING OF METAL OR PART BY IMMERSION
IN A ACID BATH. USUALLY DONE AFTER FABRICATION. |
