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Construction Phase

What are the requirements for satisfactory brazing? Answer:

  • through testing and experience
  • by using the suppliers recommendations of a suitable alloy, flux, brazing gap and heating method.  

Then the best result is achieved.

 

Guidelines:
Listed below are some guidelines.
Use them as a guide to help with the brazing objects design and tolerance limits.
Also use them to summerize and determine what effects the brazing joint's strength.

  • Fig.1.Use an overlap in the construction design whenever possible.
  • Do not use a wider brazing gap than absolutely necessary.
  • Avoid sharp edges/metal shavings after cross section alteratons near the brazing joint. As these can impede the smooth flow of the brazing material.
  • Take into consideration that large tensile differences can occur, when materials with different heat expansion coefficients are brazed together.
  • Fig.2.See illustration no. 2
  • When placing the brazing material before heating, make sure that it is situated in the area of the brazing joint which will be the last to reach brazing temperature.
  • Normally, the brazing gap should be between 0.05 - 0.2 mm- in order to achieve the best brazing result.
    (See illustration no. 3)
  • fig.3Take into consider-ation that the brazing gap can alter during heating. The recommended brazing gap should exist when the correct brazing temperature is reached.
  • Aim at achieving a surface finish of Ra 0.25 - 4.5.

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