technical information

 
     
     
     

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:

  • 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

Standard finishes: Mechanical, electrodeposited, chemical, organic, and plastic.

 

physical properties

temperature

379 Solidus - 390 Liquidus (°C)

working temperature

392-495°C

tensile strength

Exceeds 50 K.s.i. (345 N/mm2)

shear strength

Exceeds 50 K.s.i. (345 N/mm2)
Die cast 1/4" section = 52,000 psi
Ultimate tensile strength 40,000 psi

solidification shrinkage

1.2% (die design, use .3% to .6%)

thermal expansion

25C - 105C = .000762mm per C (.00003" per C)

thermal conductivity

75C - 145C 0.245 cal/cu.cm./C/second

electrical conductivity

24.9% of Copper

electrical resistivity

@ 20C = 6.8 micro-ohm - cm

impact value

Charpy 35 ft-lb

brinell hardness

97

compressive strength

Exceeds 90,000 psi

density

@ 21C = 6.7g/cu.cm

elongation

7.5% (1/4") 3% in 2";
solidification shrinkage 0.14"/ft

 

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.

   

1. Hazardous Ingredients

       

HAZARD DATA

material/
component

(CAS #)

Weight
(%)

OSHA PEL

ACGIH TLV

zinc (Zn)

       

(CAS # 7440-66-6)

90-98

2 mg/m3

2 mg/m3

aluminium (Al)

       

(CAS # 7429-90-5)

1.0-9.0

6.5 mg/m3

0.5 mg/m3

copper
(Cu)

       

(CAS # 7440-50-8)

0.1-5.0

30 mg/m3

action level

DUST

       

 

 

1.0 mg/m3(m&D)

1.0 mg/m3(m&D)

FUME

       
   

0.1mg/m3

0.2 mg/m3

 
 

2. Physical Data

       

material

Zn

Al

Cu

boiling point

     

907°C

2467°C

2595°C

specific gravity (Density @ 25C)

     

7.133 g/cm3

2.699 g/cm3

8.94 g/cm3

vapour pressure

     

N/A

N/A

N/A

vapour density

     

N/A

N/A

N/A

solubility in h2o

     

N/A

N/A

N/A

% volatiles by vol.

     

N/A

 

 

evaporation rate

     

N/A

 

 

appearance and odour

     

Silver Coloured Metal with no Odour

 
 

3. Health Hazard Information

   

(a) PRIMARY ROUTES OF EXPOSURE :

Ingestion of Dust, Inhalation of Dust or Fume

   

Zn

 

Chronic inhalation of Zinc Oxide dust or fume. NOTE: Zn is a high percentage of the Techno Weld formula

Al

 

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

Cu

 

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

 

(b) EFFECTS OF OVEREXPOSURE :

Ingestion of Dust, Inhalation of Dust or Fume

 

Acute

 

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.

Chronic

 

Fumes may cause irritation of the respiratory tract, skin and eyes.

 
 

3.1 Emergency & First Aid Treatment

 
 

Flush eyes with water at least for 15 minutes, and seek medical assistance if neccessary.

 

Remove excess dust from skin and wash affected area with soap and water. Seek medical assistance if neccessary

 

Treat burns from molten materials as you would any other serious burns

 

Inhalation: Remove from over-exposure to fresh air: Consult Physician. Keep subject warm and resting. Perform artificial respiration if breathing has stopped

 

ingestion: If large amounts are ingested, give 1-2 glasses of milk. Induce vomiting only if subject is fully consious andhas not convulsed. (Ingestion of significant amounts is unlikely.) All severe ingestion cases should have immediate medical aid.

 
 

4. Fire and Explosion data

 

Flash Point:

 

N/A

Auto Ignition Temperature:

 

N/A

Flammable Limits in Air (% by Vol.):

 

N/A

Extinguishing Media:

 

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.

Special Fire:

 

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 375C this alloy may melt and continuous heating could produce metal vapour.

     
     

5. Reactive data

     

Incompatibility

Pure Zinc

 

Incompatible with strong acids, sodiums of halogens

Pure Aluminium

 

N/A

Pure Copper

 

Incompatible with 1-bromo-2-propyne, fume is incompatible with acetylene gas, dust and mist are incompatible with acetylene gas and magnesium metal

Hazardous Decomposition

   

N/A

Hazardous Polymerisation

   

Does not occur

 
 

6. Spills, Leaks & Disposal Methods.

 

Steps to be taken:

 

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.

Waste disposal:

 

Scrap metal can be reclaimed for re-use. Follow Government and Local regulations regarding disposal

     
     

7. Special Protection Information

     

 

Specific Personal Protection

Eyes

 

Goggles, Face Sheild

Hands

 

Use chemical resistant gloves to avoid repeated skin contact

Other Clothing

 

Wear non-flammable protective clothing suitable for the process of melting, casting and torch welding

Work Hygene

 

Avoid ingestion of material. Wash hands and face before eating, drinking or consumption of tobacco

Other Handling and Storage Requirements

   

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.

 

disclaimer of expressed or implied warranties

 

Techno Weld ltd.

Tel: +44 (0)1993 851028

enquiries@techno-weld.co.uk

     
 

Guarantee
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