A Welding Certificate (Operator's Card), DD Form
facilities will forward double sets of test plates to the
2758, will be issued for each material category in which
failed welder's command concurrently with the
the welder is qualified. The welding certificate will be
notification of failure. Retest test welds must be com-
filled out, dated, and signed by an authorized
pleted and submitted within 30 days of receipt of
representative of an examination facility. Figure 6-20
notification of failure of first test weld(s). Failure of any
provides a sample of the welding certificate. Figures
retest test welds to meet minimum requirements will
6-21 and 6-22 show a sample Welding Examination
require the welder to satisfactorily complete the Navy
Record (DD Form 2757) and instructions.
training courses N-701-0008/N-701-0010, as appli-
cable, to recertify.
OXYACETYLENE WELDING
Aeronautical equipment welders may weld only on
equipment, components, and items manufactured from
Oxyacetylene welding is a gas welding process. A
the group of metals for which they are currently
coalescence or bond is produced by heating with a gas
certified and for which weld repairs are authorized by
flame or flames obtained from the combustion of
applicable technical publications or directives. Groups
acetylene with oxygen, with or without the application
of metals for which separate and distinct certification is
of pressure, and with or without the use of filler metal.
required are specified in NA 01-1A-34. Separate
A welding torch is used to mix the gases in the proper
certification is also required for oxyfuel brazing
proportions and to direct the flame against the parts to
process.
be welded. The molten edges of the parts then literally
flow together and, after cooling, form one solid piece.
NA 01-1A-34 contains additional informa-
Usually, it is necessary to add extra material to the joint.
tion and guidance relative to qualification,
The correct material in rod form is dipped in and fuses
certification/recertification, and employment of
with the puddle of molten metal from the parent metal
aeronautical equipment welders. It is, however, a
parts.
general series technical manual intended to be
used in conjunction with the OPNAV 4790.2
Acetylene is widely used as the combustible gas
and with specific maintenance/repair/overhaul
because of its high flame temperature when mixed with
manuals/engineering documents. In cases of conflict
oxygen. The temperature, which ranges from
between NA 01-1A-34 and the OPNAV 4790.2
approximately 5,700 to 6,300F, is so far above the
regarding certification/recertification policy, the
melting point of all commercial metals that it provides a
OPNAV 4790.2 takes precedence.
means for the rapid, localized melting essential in
QA/A is responsible for monitoring aeronautical
welding. The oxyacetylene flame is also used in cutting
equipment welder certification/recertification. Refer to
ferrous metals. The oxyacetylene welding and cutting
the OPNAV 4790.2 for specifics.
methods are widely used by all types of maintenance
Figure 6-20.--Welding Certification (DD Form 2758).
6-15
