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TECHNO-WELD is a proprietary alloy
based on mainly zinc, with additions of Aluminium, copper,
manganese, magnesium, and other metals. Joints may show a
weak bond if excessive silicone is present in the base metal.
No flux
is recommended for the joint, since fluxing will remove the
trace elements that align the dendrite structure before the
bond is complete. Do not use a deoxidiser on this product.
Pulsation resistance welding will allow a controlled heating
of the joint.
Join testing
was undertaken by Reynolds Aluminium, and was tested on both
3003-H14 and 1100-H14 Aluminium. T joins were made by using
2 sheets of 0.01" x 2 x 3" and were subjected to
a continuous 5% salt spray test. No failure was observed after
500 hrs.
Corrosion resistance
is dependent upon the surrounding environment. When tested
on the Eastern Seaboard, Long Island, NY, the penetration
rate reached 0.000762 mm per year. Near very heavy Industrial
operations, the penetration was magnified to 0.00173mm per
year.
This material is expected to perform safely wherever zinc
or zinc coated steel has been used in the past with success.
Several socket joints were made to simulate return bends
used in practice for 3/8" dia., .89mm wall Aluminium
tubing. They had a nominal 1/4" joint length. They were
subjected to 720 hrs. in a controlled humidity cabinet (100%
relative humidity) at 65.5°C with no visible signs of
corrosion.
Endurance limit on a 1/4" section showed a limit of
8500 psi at 100 million cycles.
Lap joins were made from 2 sheets of 1/8" thickness
Aluminium, 5" long and 2" wide. Using a Tinius Olsen
Tensile Strength Machine, the following results were obtained:
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- 28kg sheer strength for 1.27mm x 50.8mm lap (28kg
for .05" lap)
- After 48 hrs in flowing synthetic tap water: 24.6
K.s.i
- After 720 hrs in 100% relative humidity at 150°F:
15.5 K.s.i. sheer strength for .05" lap
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Standard finishes: Mechanical, electrodeposited, chemical,
organic, and plastic.
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physical properties
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temperature
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379 Solidus - 390 Liquidus (°C)
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working temperature
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392-495°C
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tensile strength
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Exceeds 50 K.s.i. (345 N/mm2)
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shear strength
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Exceeds 50 K.s.i. (345 N/mm2)
Die cast 1/4" section = 52,000 psi
Ultimate tensile strength 40,000 psi
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solidification shrinkage
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1.2% (die design, use .3% to .6%)
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thermal expansion
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25°C - 105°C = .000762mm per °C (.00003"
per °C)
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thermal conductivity
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75°C - 145°C 0.245 cal/cu.cm./°C/second
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electrical conductivity
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24.9% of Copper
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electrical resistivity
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@ 20°C = 6.8 micro-ohm - cm
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impact value
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Charpy 35 ft-lb
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brinell hardness
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97
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compressive strength
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Exceeds 90,000 psi
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density
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@ 21°C = 6.7g/cu.cm
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elongation
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7.5% (1/4") 3% in 2";
solidification shrinkage 0.14"/ft
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Comprehensive Material
Data
TECHNO-WELD
LOW TEMPERATURE ALUMINIUM FUSION WELDING RODS
AND MATERIAL.
Vendee and third persons assume the risk of injury
directly or indirectly caused by the material
if reasonable safety procedures are not followed
as provided for in the data sheet, and vendor
shall not be liable for such injury.
Furthermore, vendor shall not be liable for injury
to vendee or third persons, directly or indirectly
caused by abnormal use of the material, even if
reasonable safety precautions are followed.
All persons using this product, all persons working
in an area where this product is used, and all
persons handling this product should be familiar
with the content of this data sheet. Posting this
document for employee notification is recommended
by the vendor and may be required by law.
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1. Hazardous Ingredients
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HAZARD DATA
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material/
component
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(CAS #)
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Weight
(%)
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OSHA PEL
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ACGIH TLV
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zinc (Zn)
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(CAS # 7440-66-6)
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90-98
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2 mg/m3
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2 mg/m3
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aluminium (Al)
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(CAS # 7429-90-5)
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1.0-9.0
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6.5 mg/m3
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0.5 mg/m3
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copper
(Cu)
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(CAS # 7440-50-8)
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0.1-5.0
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30 mg/m3
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action level
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DUST
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1.0 mg/m3(m&D)
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1.0 mg/m3(m&D)
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FUME
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0.1mg/m3
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0.2 mg/m3
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2. Physical Data
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material
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Zn
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Al
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Cu
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boiling point
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907°C
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2467°C
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2595°C
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specific gravity (Density @
25°C)
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7.133 g/cm3
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2.699 g/cm3
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8.94 g/cm3
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vapour pressure
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N/A
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N/A
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N/A
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vapour density
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N/A
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N/A
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N/A
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solubility in h2o
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N/A
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N/A
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N/A
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% volatiles by vol.
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N/A
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evaporation rate
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N/A
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appearance and odour
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Silver Coloured Metal with
no Odour
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3. Health Hazard Information
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(a) PRIMARY ROUTES OF EXPOSURE
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Ingestion of Dust, Inhalation
of Dust or Fume
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Zn
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Chronic inhalation of Zinc
Oxide dust or fume. NOTE: Zn is a high percentage
of the Techno Weld formula
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Al
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Inhalation of fumes from
melting, casting, welding or burning and dust
from grinding or cutting. NOTE: Al is a low percentage
of the Techno Weld formula
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Cu
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Industrial exposure to copper
fumes, dusts or mists result in metal fume fever
with atrophic changes in nasal mucous membranes.
Chronic poisoning results in Wilson's disease,
characterised by a hepatic cirrhosis, brain damage,
demyelination, renal disease and copper deposition
in the cornea. NOTE: Cu is a low percentage of
the Techno Weld formula
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(b) EFFECTS OF OVEREXPOSURE
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Ingestion of Dust, Inhalation
of Dust or Fume
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Acute
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Excessive inhalation of
fumes from many metals can produce an acute reaction
known as "metal fever". Symptoms consist of chills
and fever (very similar to and easily confused
with flu symptoms) which comes on a few hours
after such an exposure. Long-term effects have
not been noted.
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Chronic
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Fumes may cause irritation
of the respiratory tract, skin and eyes.
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4. Fire and Explosion data
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Flash Point:
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N/A
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Auto Ignition Temperature:
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N/A
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Flammable Limits in Air (%
by Vol.):
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N/A
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Extinguishing Media:
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Special mixtures of dry
chemicals suitable for metal fume. Do not use
water or moist sand. Fire fighters should wear
self-contained breathing apparatus and protective
clothing.
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Special Fire:
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Metal products are no a
fire hazard. However, dust generated from grinding
especially if mixed with flammable coatings may
present a fire or explosion hazard under certain
conditions. At a temperature above 375°C this
alloy may melt and continuous heating could produce
metal vapour.
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5. Reactive data
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Incompatibility
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Pure Zinc
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Incompatible with strong
acids, sodiums of halogens
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Pure Aluminium
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N/A
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Pure Copper
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Incompatible with 1-bromo-2-propyne,
fume is incompatible with acetylene gas, dust
and mist are incompatible with acetylene gas and
magnesium metal
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Hazardous Decomposition
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N/A
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Hazardous Polymerisation
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Does not occur
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6. Spills, Leaks & Disposal Methods.
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Steps to be taken:
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No special precautions are
necessary for spills of bulk material. If large
quantities of dust are spilled, remove by vaccuming
with approved HEPA type filtration or wet sweeping
to prevent heavy concentrations of airbourne dust.
Clean-up presonnel should wear respirators and
protective clothing.
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Waste disposal:
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Scrap metal can be reclaimed
for re-use. Follow Government and Local regulations
regarding disposal
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7. Special Protection Information
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Specific Personal Protection
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Eyes
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Goggles, Face Sheild
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Hands
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Use chemical resistant gloves
to avoid repeated skin contact
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Other Clothing
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Wear non-flammable protective
clothing suitable for the process of melting,
casting and torch welding
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Work Hygene
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Avoid ingestion of material.
Wash hands and face before eating, drinking or
consumption of tobacco
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Other Handling and Storage
Requirements
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Use good housekeeping practices
to prevent accumulations of dust and to keep airborne
dust concentrations at a minimum. Avoid breathing
dust or fumes. Store material away from incompatible
materials, and keep dust away from sources of
ignition.
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