Brazing application fields

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DIAMOND TOOLS AND HARD METAL

The list below indicates the most suitable alloys for producing cutting tools, instruments for mine drilling or excavation, guillotine knives for paper, surgical scissors, cardboard, plastic, leather die-cuts, tools for working and cutting concrete, stone, saw blades.

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DOMESTIC & INDUSTRIAL
COOLING AND HEAT EXCHANGERS

Brazing alloys for producing engine radiators, domestic and industrial refrigerators, heat exchangers, air conditioners, water heaters and boilers, electrical appliances, electrical coils, condensers, evaporators.

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INSTALLATION OF COOLING, HEATING, REFRIGERATION SYSTEMS

The list below indicates the most suitable alloys for producing cutting tools, instruments for mine drilling or excavation, guillotine knives for paper, surgical scissors, cardboard, plastic, leather die-cuts, tools for working and cutting concrete, stone, saw blades.


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MEASURING AND CALIBRATION INSTRUMENTS

Alloys for producing thermostats, pressure switches, pressure gauges, hygrometers.

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ELECTROMECHANICAL SYSTEMS

These alloys are suitable for all electrical systems, power generators, transformers, electrical motors, armoured heating elements, electrical contacts, breakers, relays.

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TUBULAR SOLUTIONS

For constructing metal furniture, bicycle frames, mopeds, motorcycles.


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SOLAR PANELS

The brazing alloys used for producing solar panels.

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LIGHTING AND LIGHT FIXTURES

For creating chandeliers, metal fittings for furnishings, artistic objects in metal, brass musical instruments.

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RADIATORS
AND TOWEL WARMERS

For constructing radiators, towel warmers, decorative radiators.


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SILVERWARE AND JEWELLERY

Metal frames, buckles, zippers, fasteners for handbags, metallic buttons, trinkets, silverware and costume jewellery.

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GLASSES

For creating eyewear and hinges for eyeglasses.

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AUTOMOTIVE

Alloys for automotive applications accompanied by PPAP documentation.


TROUBLESHOOTING

Defects may occur when executing strong or soft brazing or welding, below the list of the most common ones and their possible causes and solutions.

The brazing alloy does not wet both surfaces of the joint

POSSIBLE CAUSES:

  • High surface contamination
  • Ineffective action of the flux
  • Formation of oxides during the heating process

SOLUTIONS:

  • Thoroughly analyse the cleaning procedures
  • Check the flux features and increase its amount
  • Contact your customer service

Internal porosity, round and brilliant

POSSIBLE CAUSES:

  • High surface contamination
  • Flux capture

SOLUTIONS:

  • Adjust the flame to neutral or to slightly oxidising
  • Check the heating procedure and the joint play

Poor fluidity of the alloy: rough junction and irregular bead

POSSIBLE CAUSES:

  • Incorrect assembly
  • Irregular heating
  • Poor ventilation of the coupling
  • Insufficient flux
  • Overheating
  • Presence of liquation

SOLUTIONS:

  • Check the joint’s play and its uniformity
  • Bring the entire junction to the brazing temperature simultaneously
  • Ensure there is a proper relief
  • Check the flux features and increase its amount
  • Change the temperature to values closer to the liquidus temperature
  • Increase the speed of heating or use an alloy with a narrow melting range

The brazing alloy does not wet one of the surfaces of the joint, whilst there is a good flow on the other

POSSIBLE CAUSES:

  • High surface contamination
  • Formation of oxides during the heating process
  • Heating procedures
  • Incorrect positioning

SOLUTIONS:

  • Thoroughly analyse the cleaning procedures
  • Contact your customer service
  • Apply more heat to the thicker component
  • Use a ring spacer to ensure an even coupling clearance

Excessive shrinkage

POSSIBLE CAUSES:

  • Inadequate local tolerance
  • Localised overheating
  • General overheating
  • High alloy cooling

SOLUTIONS:

  • Change the size of the joint
  • Balance the heating
  • Reduce the heat cycle
  • Use an alloy with a narrow melting range

Distortions

POSSIBLE CAUSES:

  • Non-uniform heating

SOLUTIONS:

  • Adjust the heating procedure to a slower thermal cycle with a more enveloping flame

Gaps, deficiencies

POSSIBLE CAUSES:

  • Excessive or variable clearance
  • Insufficient or irregular heating
  • Poor ventilation of the coupling
  • Inadequate flux

SOLUTIONS:

  • Reduce or adjust the tolerances of the coupling
  • Adjust the heating and the thermal cycle
  • Provide appropriate gas relief
  • Check the flux features and increase its quality

Cracks near the centre of the brazing bead

POSSIBLE CAUSES:

  • Thermal stress during cooling (shrinkage strain)

SOLUTIONS:

  • Make sure that the material with the highest thermal expansion is placed on the outside of the joint

Fading

POSSIBLE CAUSES:

  • Overheating
  • Insufficient flux
  • Cleaning procedure never performed
  • Components of the material or the flux

SOLUTIONS:

  • Adjust the heating cycle
  • Check the flux features, increase its amount
  • Review the cleaning procedures
  • Contact your customer service





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