T.O. 1-1A-9
TABLE 2-24. MINIMUM EDGE DISTANCES FOR SPOT WELDED JOINTS. (CONT'D)
NOMINAL THICKNESS OF THINNER
EDGE DISTANCE
SHEET INCH 1/
INCHES 2/
0.036
1/4
0.040
9/32
0.045
5/16
0.050
5/16
0.063
3/8
0.071
3/8
0.080
13/32
0.090
7/16
0.100
7/16
0.125
9/16
0.160
5/8
1/ Intermediate gages will conform to the requirements for the next thinner gage shown.
2/ In some instance edge distance less than those cited may be used provided there is noexplusion of weld metal,
buldging of the edge of the sheet or damage to bend radius by the electrode.
operation shall be made of non-magnetic materials whenever possible. When it is required that magnetic material be
used and the presence of the material requires a change in the welding current setting of more than 10% from the
established setting without the jig, separate welding schedule shall be established by the responsible process engineer.
In addition, jigs and fixtures shall be so designed that no current is shunted through them, rather than the work piece.
2-205. WELDING SAFETY PRECAUTIONS.
2-206. The following information was extracted from AFM 127-101, dated 5 November 1963, Accident Prevention
Handbook and is being included in this manual as a reference guide.
2-207. WELDING SAFETY-GENERAL. Welders during their daily work are exposed to many possible injury Inducing
environments such as follows:
a.
Harmful light rays from welding flames/arcs which can seriously injure the eyes and burn the skin.
b.
Burns to body from hot sparks, splashed metals, the welding flame and from objects being weld ed.
c.
Poisonous fumes and gases produced during the welding operation.
d.
Explosions and fire hazards when welding in done near flammable substances. In addition, explosions may
occur as a result of mishandled oxygen (due to impact sensitivity with hydrocarbons such as oil, etc.) acetylene, etc.
(due to escaped vapor, flammability, etc.).
e.
Material handling hazards such as cuts from sharp edges of metal, body injury resulting from dropping or moving
of parts and equipment.
f.
Electrical shock from various types of arc and spot welding equipment.
WARNING
Because of the many possibilities of personnel injuries and property damage it is essential
that safe welding practices be observed at all times. Only fully qualified personnel who are
trained and are familiar with required safety practices will be authorized to perform welding
operations.
2-208. PERSONNEL PROTECTION FOR WELDING. Personnel will protect themselves with suitable protective
clothing before starting any welding operation. Helmets, shields, aprons, gloves, gauntlets, goggles and other items of
approved clothing will be worn depending upon the type of protection required.
2-111
