When is brazing of tubes-to-tubesheet is done?

Brazing is done when the stress concentration and the crevice corrosion cannot be tolerated, but neither the temperature is very high nor is the possibility of leakage of one fluid into the other is hazardous.

It is generally preferred only in cases where welding cannot be done, such as joining dissimilar materials such as aluminum and steel. Since the brazing alloys (copper, copper alloys, aluminum alloys, etc.) are brittle, no welding can be done close to a brazed joint because the heat and/or the thermal stresses due to welding may crack the brazed joint.

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Tags: brazing, crevice corrosion, thermal stress, welding

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