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Molybdenum Wire Types
Diameter (inch)
Tolerance (%)
Molybdenum Wire for EDM
0.007" ~ 0.01"
±3% wt
Molybdenum Spray Wire
1/16" ~ 1/8"
±1% to 3% wt
Molybdenum Wire
0.002" ~ 0.08"
±3% wt
Molybdenum Wire(clean)
0.006" ~ 0.04"
±3% wt
Wire diameters are generally expressed in terms of inches or mils (thousandths of an inch). For thin wires from 0.001 inches up to 0.020 inches, the size of the wire is measured by weight per unit length. That is, the weight expressed in mg of a 200mm length of wire. The standard diameter tolerance is ±3% of the weight measurement. For mandrel applications, the tolerance is normally ±1%.
Tensile Strength
Tensile strength for molybdenum wire is usually expressed in grams per milligram weight of a 200-millimeter length (or) g/mg/200mm. The normal range of values is 40 to 60 grams. In general, as tensile strength increases, wire straightness decreases.
Straightness
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The measure of the straightness of a metal wire is obtained by cutting a ten-inch long piece of wire and allowing it to lie on a flat clean surface. The maximum deviation from a straight line along its length is the quantitative measure of its straightness. In general, as the degree of straightness increases, tensile strength decreases.
Out-of Roundness
Out-of-roundness of the wire does not exceed 4% of the wire diameter. It is measured as follows: Out of Roundness = (Max Diameter ? C Min Diameter) / Max Diameter x 100
Quality and Finish
The wire is free of scratches, kinks, and distortions insofar as they are harmful to the intended use of the product. Surface finish is supplied in the black, as drawn condition, where drawing lubricants and oxides are retained on the surface, or in the cleaned condition by firing in hydrogen or electrochemical etching.
Spooling
The wire is spooled on clean, defect-free spools. For very large diameters, wire is self coiled. Spools are level filled without piling near flanges. The outer end of the wire is properly marked and attached securely to the spool or self-coil.
Name
Specific Property
Application
Molybdenum wires cleaned by electrolysis
The aquadag layer can be removed by electrolysis.
Mandrels of tungsten coiled coil
Molybdenum wires cleaned in a hydrogen atmosphere
The aquadag layer can be removed in a hydrogen atmosphere.
Used in making supports for various types of bulb
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