Advantages
of
Braze
Welding -
(i) Low thermal stresses reduce the possibility of cracking in cast Iron.
(ii) Low peak temperatures avoid the formation of brittle transformation products as seen in other welding processes.
(iii) The copper alloy weld metal is sufficiently ductile to absorb most shrinkage stresses without cracking.
Disadvantages of braze welding
(i) There is a colour mismatch between the weld metal and the base metal.
(ii) Strength of a braze weld falls off rapidly with increasing temperature, so this process is not used where service temperatures exceed 260°C.
(iii) Galvanic corrosion, due to dissimilar metals, may be a problem.
(iv) Corrosion resistance of weld metal is low when it is exposed to strong alkalies.
