Salt-bath dip brazing can be separated into the following phases:

* Cleaning
Before brazing, pieces are thoroughly cleaned of grease and

oxides. Degreasing is followed by soaking in sulphuric and nitric

acids. 

 

 

 
* Assembly
The pieces are assembled and held chiefly with screws, wire

or tack-welding, or using self-fixing designs that can be rivet

together. During assembly, the brazing alloy is applied in the form

of paste, foil or wire, the form chosen being determined by the

location and shape of the joint. For long runs, or where it is very

important to control amounts of brazing alloy, cladded brazing

sheets are used. Concealed joints can be brazed by assembling

and applying brazing alloy successively.

 

 

 

 
* Pre-heating
After assembly and clamping, the components are pre-heated to

560 ºC. Pre-heating takes 10 to 15 minutes. 

 

 

 

 

 

 

 

  

* Brazing
In the brazing process, the components are dipped in a salt bath
consisting of sodium, potassium and lithium chlorides and sodium

fluoride. The temperature is adjusted to reach the brazing range

of 585-590 ºC. Brazing time is normally between 1 1/2 and 3

minutes. 

 

 

 

 

 

 
* Final cleaning
After brazing, the corrosive film of salt coating the components is

removed by thorough washing with hot water. Specially developed

program-controlled laboratory dishwashers are used to ensure

complete cleaning.