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Repair of Cracked Welds
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TM-5-5420-279-23 Dry Support Bridge (DSB) (NSN
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Repair of bent plates, channel sections etc.
TM 5-5420-279-23
CAUTION
Take care not to damage the parent metal. Ensure that the defective weld has been
completely removed.
(b)
Hand mill a gradual taper at each end of the cut-out area.
NOTE
Depending upon the component, the type of joint and the length of the weld, it may
be permissible to remove the weld on a milling machine.
(c)
If applicable, hand mill the original weld preparation on the parent metal. (See
Sections 5 and 6).
(d)
Wire brush the joint to remove all loose material and oxide film.
(e)
Inspect visually for any remaining cracks.
CAUTION
Do not use the dye penetrant technique. The seepage of dye through exposed joint
gaps will contaminate the parent metal and cause porosity in the repair weld.
WARNING
PRIOR TO ANY WELDING ON THE LAUNCH VEHICLE PROCEDURE 6-39 GENERAL
WELDING MAINTENANCE FROM TM 9-2320-364-34-2 CHAPTER 2 MUST BE
PERFORMED ALONG WITH THE DISCONNECTION OF ALL EXTERNAL MIL
CONNECTORS FROM BOTH THE LAUNCHER CABINET AND THE OPERATOR
CABINET. BOTH THE CHEST PACK AND THE TAIL LIFT PENDANT MUST ALSO BE
REMOVED.
(4)
Apply new weld
(a) Note the welding conditions for type of joint and weld size. See Section 5.
(b) Finish weld as required.
(c) Dress the weld.
(5)
Final Inspection
Inspect the weld using the dye penetrant technique (Section 3 c.).
Appendix K Page 6

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