Densimet Tungsten Alloys

Densimet alloys are materials with high tungsten content and low amounts of NiFe or NiCu.

Advantages:

  •  High density (17.0~18.5g/cm3).
  •  High modulus of elasticity.
  •  Good machinability.
  •  Harmless to the health and environment.
  •  Good mechanical properties
  •  High absorption capacity against x-rays and ?-rays

Applications:

  •  Balancing weights.
  •  Balls in bomb.
  •  High voltage electrical contact.
  •  Protection shields for nuclear radiation.
  •  Electroheat upsetting anvil block.
  •  Substitutional material for Uranium.
  •  

Tungsten-Copper Composites

WCu composites are offered with 10?40wt.% Cu

Advantages:

  •  High thermal conductiveity.
  •  Low thermal expansion.
  •  High arc resistance combined with good electrical conductivity.

Applications:

  •  Arcing contacts and vaccum contacts in high and medium voltage breakers or vaccum interruptors.
  • Electrodes in spark erosion cutting machines.
  • Heat sinks as passive cooling elements of electronic devices.

 

Tungsten Bar

 Appearance:

  • The tungsten bar is fine-grained and has a luster rather like that of silver in uniform color.
  • Though the whole bar may slightly is curved, the maximum height of the bend should not be more than 15mm. It measures 12x12x510.

Applications:

Purified tungsten bars are used as a material for making special steels and tungsten wire, or used in electric contact points. Tungsten bars with impurities are used to procedure bulb filaments or electron tube filaments, which are guaranteed to have remarkable resistance to high temperature.

Technical Data:

Impurity quantity

Tungsten

Weight

Density

%

%

g/piece

g/cm3

<0.05

 >99.5

1,200

17.6---18.2

 

Tungsten Rod

Applications:

  • For producing electric light source parts and electric vacuum components.
  • For producing heating elements and refractory parts in high temperature furnaces.
  • For producing electric contacts.

 Chemical Composition

Trade Mark

Tungsten

Impurity Elements Content

Total%

Each%

WAL1  WAL2

>99.95

<0.05

<0.01

W1

>99.95

<0.05

<0.01

W2

>99.92

<0.08

<0.01

Type and Size

Type

Swaged Rods

Straightened Rods after Drawn

Grand rods available

Size

Ф2.4~50mm

Ф0.8~3.2mm

 

Tungsten evaporation boats and coils

All kinds of tungsten evaporation boats and coils are available according to the requests of customers.

  

Tungsten Granules

Appearance:

  • Grey polyhedral crystal.

Particle size:

  • -12~+80 mesh, plus sieve material, <5%; minus, <7%.

Impurity Content:

  • C<0.001%, S<0.001%.

Application:

  • Mainly used as the flux for the analysis of carbon and sulphur.

WRe3/WRe25 Thermocouple

Applications:

  • Mainly used to measure temperature (<2000?) under reductive atmosphere.

Chemical Composition:

Grade

Diameter (mm)

Working Temperature C

Accuracy  %

Uniformity(at1500?)

WRe3(+)

WRe25(-)

Gr.1

0.1

1800

±0.25

< 40

< 30

Gr.2

0.1,0.25,0.5

1800

±0.5

< 45

< 35

 

Tungsten Thorium Wire and Rod

Grade Use

Grade

Use

WTH7

Ratio tube, Pothook of emissive tube. Spring. High temperature electrode and cathode of gas discharge lamp-house etc.

WTH10. WTH15

Cathode of ratio tube. Grid. High temperature electrode and resistance shake filament etc.

Norm Table

Grade

WTH7

WTH10

WTH15

Max diameter, um

1800

Min diameter, um

150

Chemical composition: %

Grade

W content >

ThO2 content

Total impurity content <

Every impurity content <

WTH7

98.9

0.70-0.99

0.10

0.01

WTH10

98.41

1.00-1.49

0.10

0.01

WTH15

97.91

1.50-1.99

0.10

0.01

Diameter tolerance:

Diameter (d) UM

Weight tolerance/200mm%

Diameter tolerance %

I class

II class

I class

II class

150<d<300

±1.5

±2.0

-

-

200<d<350

±1.0

±1.5

-

-

350<d<500

-

-

±1.5

±2.0

d>500

-

-

±1.0

±1.5

Norm table of spool and coil:

Diameter (d) UM

Norm of spool and coil, mm

Norm of spool

Norm of coil

Inner diameter

Width

d<350

85

15-20

-

350<d<500

-

-

135

500<d<750

-

-

210

750<d<1200

-

-

350

1200<d<1800

-

-

600

Condition of roll wire

Grade diameter, um

Core multiple

Rolling way

Rolling length

Condition of heating

WTH7 WTH10

WTH15

260<d<800

4

Handwork

4-5

Temperature 600-800?

Heating way, direct or indirect

WTH7 WTH10

WTH15

d<260

4

Handwork

4-5

Normal temperature

 

Tungsten Thorium Rod

Kind

Norm

Max diameter

Min diameter

Non-grinding rod

Wrought rod

10.0

2.8

Rectifying straight rod

2.8

0.8

Grinding rod

9.0

0.8

 

Size/Diameter, mm

Diameter tolerance, mm

0.8<d<1.5

1.0

1.5

0.02

1.5<d<3.0

1.5

2.0

0.03

3.0<d<6.5

1.5

2.0

0.03

6.5<d<10

1.5

2.0

0.08

Surface quality:

  • Surface shows uniform black color, smooth. There isn’t mildew, burr and oxidation and limitation that can affect use.
  • Wrought rod: There isn’t crack, delaminating and burr. Slight mark of forging hammer and film oxide is allowed.
  • Color of surface: black or dark gray. Grinding rod: There are not crack and longitudinal lines.
  • Color of surface: metal luster.

Tungsten Wire

Application:

  • For producing electric light source parts and electric vacuum components.
  • For producing heating elements and refractory parts in high temperature furnaces.
  • For producing heating elements used in vacuum metalizing or plating.

Appearance:

  • The tungsten wire is is regular black covered with graphite. After graphite removed it is metallic luster.

Technical Data

Specifications

10-15W

25-60W

100-200W

300-1000W

Impurity quantity, %

0.05

0.05

0.05

0.05

Tungsten

the rest

the rest

the rest

the rest

Allowable deviation at mg/200 mm (%)

±3

±2.5

±2

±1.5

Deviation of single axis at weight (%)

1/2 of same gradational tolerance

1/2 of same gradational tolerance

1/2 of same gradational tolerance

1/2 of same gradational tolerance

 

Stranded Tungsten Wire

Stranded Tungsten Wire is uniformly silver-grayish in color. It is made of first-grade tungsten bars with excellent resistance to high temperature, evenly stranded and free of mould stains and cracks. It has good flexibility for processing purpose. When heated to high temperature, it will not slack off nor deform.

Application:

Stranded Tungsten Wire can be used for vacuum filmplating or high-temperature heating elements. Particular specification required by the customer can be satisfied through consultation with us.

 

Ceriated Tungsten Electrode

Ceriated Tungsten is Tungsten doped by Cerium. It is a non-radioactive material. It is known to be especially good for DC welding with low amperage because it starts very easily at low amps and usually requires about 10% less amps to operate than thoriated material.

It is very popular to be used for the welding of orbital tube, pipe, very small parts, short welding cycles and also where a specific number of welds are called and then the electrode is to be replaced.

 

 Lanthanated Tungsten Electrode

The lanthanated tungsten became very popular in the circle of welding in the world soon after it was developed because of its good welding performance .The electric conductivity of Lanthanated Tungsten is most closed to that of 2% Thoriated Tungsten. Welders can easily replace Thoriated Tungsten Electrode with Lanthanated tungsten Electrode at either AC or DC and not have to make any welding program changes. The radioactivity from Thoriated Tungsten can thus be avoided. Another advantage of Lanthanated Tungsten is being able to bear high current and having the lowest burn-loss rate. Our WL Electrodes are state patent products.

 Zirconiated Tungsten Electrode

Zirconiated Tungsten has good performance in AC welding. It balls up well in AC welding and has a more stable arc than pure tungsten. Especially with excellent performance in high load AC welding,it is not replacable by any other electrodes. It also resists containation well in AC welding. Zirconiated Tungsten is most commonly used for AC welding of aluminum and magnesium alloys.

Technical Data

Trade Mark

WL10

WL15

WL20

WC20

Added impurity

La2O3

La2O3

La2O3

CeO2

Impurity quantity %

0.8-1.2

1.3-1.7

1.8-2.2

1.8-2.2

Other impurities %

<0.20

<0.20

<0.20

<0.20

Tungsten

the rest

the rest

the rest

the rest

Electric discharged power

2.6-2.7

2.8-3.0

2.8-3.0

-

Color sign Black

Black

Golden Yellow

Sky Blue

Grey

 

 Pure Tungsten, Yttriated Tungsten and Composite Electrodes

Pure Tungsten Electrode: Suitable for welding under alternating current.

Yttrium-Tungsten Electrode: Mainly applied in military and aviation industry with narrow arc beam, high compressing strength, highest welding penetration at medium and high current.

Composite Electrodes: Their performance can be much improved by adding two or more rare earth oxides which are mutually complementary. The Composite Tungsten Electrode developed by us has been listed in State Developing Plan for new products.

 

 Thoriated Tungsten Electrode

Thoriated Tungsten Electrode: As traditional products, WT application area becomes more and more limited due to radioactive contamination.

Technical Data

Type of Electrode

Pure Tunsten Electrode

Yttriated Tungsten Electrode

Composite Electrode

Thoriated Tungsten

Trade Mark

WP

WY20

WT20

-

Added impurity

-

YO2

-

ThO2

Impurity quantity %

-

1.8-2.2

1.0-4.0

1.7-2.2

Other impurities %

<0.20

<0.20

<0.20

<0.20

Tungsten

the rest

the rest

the rest

the rest

Electric discharged power

4.5

2.0-3.9

2.45-3.1

-

Color sign Black

Green

Blue

-

Red

 go to product order

For any particular request please contact:  info@flokal.eu

© Copyright Flokal 2009