 What are soldering and brazing
 Soldering of Aluminium
 Brazing of Aluminium
 Aluminium soldered  brazed products
 S...
 Joining process using
a heating method and
a filler metal
without melting
the base materials .
 SOLDERING  BRAZING
 Filler metal has a
liquidus below 800 F .
 Joint strength ↓
 cost ↓
 resistance to
corrosion ↓....
 Joining dissimilar metals and non-metals
 allows much tighter control over tolerances
 Low temperature compared to wel...
 the lack of joint strength .
 joint colour
 damaged under high
temperature condition .
 Active fluxes
 Low temperature soldering
390 F → 650 F
 High temperature soldering
250 F → 400 F below
Al-alloys melti...
 Close temperature control is required .
 The brazing temperature should preferably be
70 F below melting point of Al
 ...
• Aluminium products joined by
brazing/soldering
• Aluminium frames
 Almost all aluminium alloys can be soldered
 Alloys containing more than 1% Mg can not be
soldered satisfactorily . (5x...
 1xxx , 3xxx , 6xxx and low-Mg members of
5xxx are most successfully brazed alloys
 2xxx , 7xxx not normally brazed beca...
1.Low-temperature
 Melting between 300 F → 500 F
 Composed of Tin, lead, zinc, cadmium
And small amount of Al ,copper ,N...
2. Intermediate-temperature solder
 Melts at 500 F → 700 F
 Contains : Tin ,Zinc < 30% → 70%>
and Small amount of copper...
3.High-temperature solders :
 Melts between 700 → 800 F .
 Containing from 90% → 100% Zn and from
2% → 10% Al .
 Strong...
 Powder , paste or wire
 Commercial filler metal alloy using in
Al-brazing are :
Aluminium-silicon alloys
containing
7%→...
 To reduce brazing temperature the
following alloy elements were added :
1. copper → intermetallic compound AL-Cu
2. Germ...
 Flux function
 Aluminium brazing fluxes
 contain chlorides and fluorides
 Aluminium soldering fluxes
1.Organic : melt...
 Iron soldering
Common in Al assemblies
 Furnace soldering
Large assemblies
 Abrasion soldering
no flux
 Induction sol...
 Flame soldering
manual or automatic ,
No limitation on thickness
 Dip soldering
High production rate
 Torch brazing
economical
 Furnace brazing
↑ production rate
 Dip brazing
the best method for AL
 Any solderable material can be soldered to
Aluminium .
 Magnesium, titanium,
tungsten , are difficult to
solder to Alum...
 Al can be brazed to many other metals
 Al to copper : is difficult to braze because of
low melting temperature (1018 F)...
That depends on :
1. Strength requirements
brazed joints can be 3 – 10
the strength of soldered joints
2. Corrosion resist...
Thank you
Soldering and brazing of aluminium
Soldering and brazing of aluminium
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Soldering and brazing of aluminium

  1. 1.  What are soldering and brazing  Soldering of Aluminium  Brazing of Aluminium  Aluminium soldered brazed products  Solerabilty of aluminium alloys  Brazeabilty of aluminium alloys  Solders  Filler metal used in brazing Aluminium  Fluxes  Soldering methods  Brazing methods  Soldering brazing Aluminium to other metals  Is soldering or brazing more suitable
  2. 2.  Joining process using a heating method and a filler metal without melting the base materials .
  3. 3.  SOLDERING  BRAZING  Filler metal has a liquidus below 800 F .  Joint strength ↓  cost ↓  resistance to corrosion ↓.  Filler metal has a liquidus above 800 F .  Join strength ↑  cost ↑  resistance to corrosion ↑
  4. 4.  Joining dissimilar metals and non-metals  allows much tighter control over tolerances  Low temperature compared to welding  less thermal distortion  clean joint  Speed of joining  Easy realignment  Less manual skills
  5. 5.  the lack of joint strength .  joint colour  damaged under high temperature condition .
  6. 6.  Active fluxes  Low temperature soldering 390 F → 650 F  High temperature soldering 250 F → 400 F below Al-alloys melting point
  7. 7.  Close temperature control is required .  The brazing temperature should preferably be 70 F below melting point of Al  In condition of accurately controlled of temperature it can be done at 10 F  Most brazing is done between 1020 →1180 F
  8. 8. • Aluminium products joined by brazing/soldering
  9. 9. • Aluminium frames
  10. 10.  Almost all aluminium alloys can be soldered  Alloys containing more than 1% Mg can not be soldered satisfactorily . (5xxx _ 6xxx) (intergranular penetration )  Alloys containing more than (5%) Si can not be soldered (4xxx 6xxx)
  11. 11.  1xxx , 3xxx , 6xxx and low-Mg members of 5xxx are most successfully brazed alloys  2xxx , 7xxx not normally brazed because of low melting temperature .
  12. 12. 1.Low-temperature  Melting between 300 F → 500 F  Composed of Tin, lead, zinc, cadmium And small amount of Al ,copper ,Nickel  Good low-temperature solder used in aluminium soldering is : The eutectic alloy containing : 91%SN , 9%ZN Melts at 400 F
  13. 13. 2. Intermediate-temperature solder  Melts at 500 F → 700 F  Contains : Tin ,Zinc < 30% → 70%> and Small amount of copper, lead and silver  Stronger joints
  14. 14. 3.High-temperature solders :  Melts between 700 → 800 F .  Containing from 90% → 100% Zn and from 2% → 10% Al .  Strongest and superior corrosion resistance .
  15. 15.  Powder , paste or wire  Commercial filler metal alloy using in Al-brazing are : Aluminium-silicon alloys containing 7%→12 Si
  16. 16.  To reduce brazing temperature the following alloy elements were added : 1. copper → intermetallic compound AL-Cu 2. Germanium → expensive 3. Beryllium → healthy hazards
  17. 17.  Flux function  Aluminium brazing fluxes  contain chlorides and fluorides  Aluminium soldering fluxes 1.Organic : melts 400 → 525 F  Contain zinc fluoride or zinc chloride 2. Non-organic : melts 540 → 720 F
  18. 18.  Iron soldering Common in Al assemblies  Furnace soldering Large assemblies  Abrasion soldering no flux  Induction soldering rapid
  19. 19.  Flame soldering manual or automatic , No limitation on thickness  Dip soldering High production rate
  20. 20.  Torch brazing economical  Furnace brazing ↑ production rate  Dip brazing the best method for AL
  21. 21.  Any solderable material can be soldered to Aluminium .  Magnesium, titanium, tungsten , are difficult to solder to Aluminium .
  22. 22.  Al can be brazed to many other metals  Al to copper : is difficult to braze because of low melting temperature (1018 F) of Al-copper eutectic composition .  Al to steel : possible (dip brazing)  Al to magnesium : easy but brittle joint .
  23. 23. That depends on : 1. Strength requirements brazed joints can be 3 – 10 the strength of soldered joints 2. Corrosion resistance solders are less corrosion resistance 3. Temperature 4. Cost
  24. 24. Thank you

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