MIL-S-49442 (ER)
3.10.5
Soldering.
3.10. 5.1
Solder.
Solder shall conform to QQ-S-571 for soldering electrical
connections, composition SN60, Type AR or S, shall be used for general purposes;
and composition SN62 or SN63, Type AR or S, for special purposes,
When type S
solder is used for soldering electrical connect-ions, the flux shall conform to
MIL-F-14256.
3.10.5.2
Acid or acid salts.
No acid or acid salts shall be used in preparation
for or during soldering; however, exception is permitted for preliminary tinning
of electrical connections and for tinning or soldering of mechanical joints not
used to complete electrical circuits, but in no case shall acid or acid salts be
used when they can come in contact with insulation material.
Where acid or acid
salts are used, as permitted above, they shall be completely neutralized and re-
moved immediately after use.
3.10.5.3
Process.
There shall be no sharp or rough surfaces resulting from
insufficient heating.
The solder shall feather out to a thin edge, indication
proper flowing and wetting actions, and shall not be crystallized, overheated or
underheated.
The minimum necessary amount of flux and solder shall be used for
electrical connections.
Any means employed to remove an unavoidable excess of
flux shall not incur the risk of loose particles of flux, brush bristles, or
other foreign material remianing in the equipment; flux being spread over a large
area; or damage to the equipment.
Insulation material that has been subjected to
heating during soldering operation shall be undamaged and parts fastened there-to
shall not have become loosened.
3.10.6
Welding. Wherever practical, welded joint shall conform to MIL-STD-21,
and MIL-W-45205, Class B, and shall be such that grinding on the finished weld
will be unnecessary.
Spot, stitch, and seam welds shall conform to MIL-M-6858,
Class B.
Cleaning prior to welding.
3.10.6.1
Surfaces to be welded shall be cleaned in
accordance with good commercial practice and shall be free from rust, scale, paint,
grease and other foreign material.
Process.
3.10.6.2
Preheating shall be employed where distortion is likely to
result from welding.
Welds shall have thorough penetration and good fusion and
shall be free of scabs, blisters, abnormal pockmarks, cracks, voids, slag in-
clusions, and other harmful defects.
Inert-gas-shielded arc welding shall be used, when practicable, for welding al-
uminum, magnesium or stainless steel.
3.10.6.3
Cleaning after welding.
Welded assemblies shall be cleaned to remove
rust, scale, oxidation products, and excess flux by sandblasting, wire brushing,
or other suitable means.
Prior to painting, steel parts that have been arc welded
or acetylene welded shall, in addition, be subjected to vat passivation or a
phosphoric acid etch in accordance with MIL-M-10578. Acid used for cleaning
shall be completely neutralized and removed.
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