Surface conditioning

mately 900 F or until flux m e l t . Apply flux and

provide clearance to insert new tubes.

continue heating locally until brazing temperature

(7) Insert new tubes and weld, in accordance

(1080 F) is reached. Apply filler at brazing temper-

with d above, using aluminum alloy 6061, 1100, or

ature.

3003.

(2) Apply brazing alloy.

NOTE

(3) Immediately after brazing, quench work in

Tube size, material, and configuration must

water heated to a minimum of 180 F. Additional

be equal to original.

washing in hot water and acid is necessary to re-

move corrosive flux.

g . Repair of leak in tube, using torch brazing proc-

5. Test. a. Using air, nitrogen, or inert gas, test cool-

ess:

er for leaks under water at 400 psi.

(1) Using torch, preheat work area to approxi-

Figure 1. Tube replacement details.

will submit DA Form 2028 (Recommended Changes

b. Dry thoroughly with compressed air.

to Publications) direct to the Commanding Gen-

6. Surface conditioning. Apply chemical treat-

eral, U.S. Army Tank-Automotive Command, ATTN:

ment (Alodine).

AMSTA-MAP, Warren, Mich. 48090. Contrac-

7. Reporting Of Equipumnt Publication Improve-

tor will submit a "Report of Shortcoming" to the

ments. The reporting of errors, omissions, and recom-

Contractor Officer or his designated representa-

mendations for improving this publication by the

tive.

individual user is encouraged. Depots/Arsenals