Filler Metals for Brazing Titanium

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Welding Titanium

Heat treatments of titanium alloys are established by taking into account the temperatures at which phase transformations occur. Brazing-titanium should be performed at temperatures that do not compromise the mechanical properties expected in the base metal.

Therefore the Brazing-titanium filler alloys should be selected so that their brazing temperature is within the recommended range for heat treatment of the alloys to be brazed.

Titanium commercially pure and alpha alloys should be brazed below the beta transus temperature (that at which the phase changes from alpha to beta), otherwise a coarse grain microstructure could develop with impaired ductility.

The suitability of selected filler metal for Brazing-titanium should be verified by testing to make sure that design requirements for strength and ductility are met after brazing and that there is no danger of galvanic corrosion from the brazing alloy in the actual service.

The following Table shows a few of the most common filler alloys used for Brazing-titanium. It should be noted that many more proprietary alloysare commercially available, and that a few other that were used for academic study may not be readily found in the market.

Filler metals are available as powders and as foil, sometimes maid by compacting amorphous powders obtained by rapid solidification. The main suppliers advertise their availability for advising on filler metal selection and corrosion resistance.

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