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Refrigeration, Heating and Air-Conditioning (HVAC)

Brazing of aluminium air-conditioning components for cars

Air-conditioning in cars is widespread. Because of the need for lightweight components aluminium is a natural choice for air-conditioning components. Aufhauser offers a range of products for brazing this type of component. Brazing preforms such as rings and pressed or stamped washers are often specified as is brazing paste.

Aufhauser Product name
Nominal Chemical Composition %
Solidus/ Liquidus °F AWS A5.10  
Al Si Fe Cu Zn Mn
Alloy 4047 Remainder 12 0.8 0.3 0.2 0.2 1070/1080 ER & R 4047  Request Quote

 

Brazing of heat exchangers

Brazed joints are made commonly on copper air coil heaters / heat exchangers using Aufhauser brazing filler metals. Copper return bends are brazed using PhosCopper 5 brazing filler metal, whilst copper to copper joints on connecting pipe-work are made with PhosCopper 0. May be used where other metals such as brass or mild steel components are involved.

Aufhauser Product name
Nominal Chemical Composition %
Solidus/ Liquidus °F
AWS A5.8
 
Ag Cu P
PhosCopper 5 5 89 6 1190/1495 BCuP-3  Request Quote
PhosCopper 0 0 92.75 7.25 1220/1305 BCuP-2  Request Quote

 

Brazing of heated towel rails

Heated towel rails are now widely used in the home as well as in hotels. They are often constructed from brass tubes and fittings that are brazed together and subsequently plated. The brazing filler metal must have a comparatively low melting point so as not to melt or distort the brass. Brazed joints must be smooth and neat in their appearance. In most cases therefore, the filler metal will need to be free-flowing. Aufhauser has developed SilverAlloy A-45T for this application although some customers prefer to use SilverAlloy A-56T.

In some cases the design of the towel rails is such that the joint gaps between the tubes / fitting is not easy to control. In these cases a less free-flowing filler metal that is a better gap-filler can be used.

Aufhauser Product name
Nominal Chemical Composition %
Solidus/ Liquidus °F
AWS A5.8
 
Ag Cu Zn Sn Ni
SilverAlloy A-56T 56 22 17 5 1145/1205 BAg-7  Request Quote
SilverAlloy B-56Ni2 56 42     2 1420/1640 BAg-13a  Request Quote
SilverAlloy A-45T 45 27 25 3   1195/1291 BAg-36  Request Quote

 

Brazing of heating elements

Heating elements are manufactured using a variety of parent metals for a range of different applications. Parent metals used can be, for example, copper and copper alloys, stainless steel and nickel chromium alloys. Choice of brazing or soldering filler metal will be determined by the parent metals, service conditions, joint gaps and heating methods. For further advice on the correct choice of filler metal and flux, consult Aufhauser technical department.

 

Brazing of filter driers for refrigeration and air-conditioning systems

Brazing of filter driers for refrigeration and air-conditioning systems on a mass production basis is best achieved using a continuous furnace with a reducing atmosphere. The choice of brazing filler metal will depend on the parent metals involved (mild steel body and cap with copper outlet tube or all mild steel components). A copper-tin brazing filler metal will be necessary with copper outlet tubes on filter driers for refrigeration systems, while copper can be used for mild steel to mild steel joints with interference fits, and B-Bronze for variable joint gaps. Brazing rings are a common product form for these brazing filler metals in this type of application.

Aufhauser Product name
Nominal Chemical Composition %
Solidus/ Liquidus °F
AWS A5.8
 
Ag Cu Zn Ni Sn Cd
521 Phosphor Bronze-C   91.6 0.2   8   1620/1880    Request Quote

 

Brazing materials for distributors of refrigeration supplies

Aufhauser supplies a range of brazing and soldering filler metals that are used in the refrigeration and air-conditioning industry world-wide. Brazing standards and preferred filler metals vary from country to country. The selection of filler metals and fluxes shown below will cover most requirements in this industry. These products can be supplied in Aufhauser packaging in order to take advantage of the well known branding and of the opportunity for small quantity packs. Alternatively, Aufhauser is able to supply to 'own label' requirements for companies wishing to use their own brand names.

Aufhauser Product name
Nominal Chemical Composition %
Solidus/ Liquidus °F
AWS A5.8
 
Ag Cu P    
PhosCopper 15 15 80 5     1190/1475 BCup-5  Request Quote
PhosCopper 6HP 6 86.75 7.25     1190/1325 BCup-4  Request Quote
PhosCopper 5 5 89 6     1190/1495 BCup-3  Request Quote
PhosCopper 2 2 91 7     1190/1450 BCup-6  Request Quote
PhosCopper 0   92.75 7.25     1310/1460 BCup-2  Request Quote