To Age or Not to Age

[DJ1958]

At present I have a component that was unsuccesfully vacuum brazed. Vanes installed have two voids in the braze joint. They were tack welded with AMS 5774 weld wire and brazed with AMS 4777 Silver Braze Alloy. The OEM repair is fuzzy here. If accepted the next step would cryogenically freeze the part at 100 degrees below zero for three hours to age. Rebrazing is not discussed until after the part has been aged by freezing. Some people involved want to age the part prior to repairing it in the vacuum oven. Others think it would be a waste of money when we should be able to send it back in the vacuum furnace to re-braze the voids. Either way it will be followed by the Age cycle. Any opinions out their?

 

[Goahead]

Hi,

SAE AMS 4777 is not a Silver Braze Alloy.

NICKEL ALLOY, BRAZING FILLER METAL 82NI - 4.5SI - 7.0CR - 3.1B - 3.0FE 1780 TO 1830 DEGREES F (971 TO 999 DEGREES C) SOLIDUS- LIQUIDUS RANGE

As you did not specify your base metal we cannot guess its solutioning and aging temperatures.

As long as aging temperature is lower than brazing temperature, brazing would overage and decrease the properties. Therefore it is not useful before repair brazing.

Ideally brazing temperature should be near solutioning temperature to get both operations in the same furnace.

http://www.welding-advisers.com/