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Cleaning
the Metal
Before
welding
is
begun,
it is important
that
surfaces to be welded are clean
Oil, grease, paint,
rust, dirt or other contaminants
should be removed
in order
to prevent
gases produced
from
these
materials
from
contaminating
the inert-gas
and
interfering
with a normally
clean, smooth
flow of
weld
metal.
These
gases
can
cause
porosity,
incomplete
fusion,
inadequate
penetration,
and
under-cutting,
in addition
to rough welds of poor
appearance
Cleaning may be accomplished
with liquid cleaners
and vapor, or mechanical
methods, Liquid cleaners,
such as naphtha, mineral spirits, alcohol,
acetone,
or methylethyl-ketone
may be used, Liquid cleaners
or solvents
should
not
be used after a joint
is
assembled
All surfaces should be wiped dry with a
clean cloth
Imbedded dirt may be removed with a
file, chisel, wire brush, etc., provided these tools are
clean and free of oil Grinding
is not recommended
Recommended
Settings
BRASS
ALLOYS
AC_HF
DC*SP
TUNGSTEN
WELDING
WELDING
SHIELDING
FILLER
METAL
TYPE OF
ELECTRODE
CURRENT
CURRENT
GAS-ARGON
ROD
THICKNESS
WELD JOINT
DIAMETER
(AMPS)
(AMPS)
CU.FTJHR.
DIAMETER
t/16"
(.062-)
Square
Groove
1/16" (.082-)
105_155
85-125
15
1/!6"
(,062")
1/16 '° (,062")
Fillet
1/t6"
(.082-)
105-155
85_125
15
1/16" (,062")
1/8' (.125")
Square
Groove
1/t6"
(,062")
145-t90
115-150
15
3/32" (.093")
1/8" (,125")
Fillet
1/16" (.062")
145-190
115-150
15
3/32'
(,093)
3/16" {.18T')
Square
Groove
3/32"" (.093")
180-200
145-195
20
3/32" (.093")
3/16"' (.187")
Fillet
3/32"' (,093")
180-200
145-195
20
3/32" (,093")
I/4"
(.250)
Square
Groove
3/32" (.093")
--
t60-200
25
t/8"
(,125")
t/4"
(.250")
Fillet
3/32" (.093")
--
160-200
25
1/8' (.125")
MILD STEEL
AC-HF
DC*SP
TUNGSTEN
WELDING
WELDING
SHIELDING
FILLER
METAL
TYPE OF
ELECTRODE
CURRENT
CURRENT
GAS-ARGON
ROD
THICKNESS
WELD JOINT
DIAMETER
(AMPS)
(AMPS)
CU. FT,/HR.
DIAMETER
t/32"
(,03I")
Square
Groove
1/16'" (_062")
95-125
75-100
10
1/16'" (°062")
t/32"
(.03t")
Fillet
1/16"' (.062")
95-125
75_100
10
1/t6"
(.062"')
3/64" (.046")
Square
Groove
1/16" (.062")
tt5-t50
90-120
10
1/16'
(.062)
3/64" (.046)
Fillet
1/16" (.062")
115-I50
90-120
10
1/16" (,062")
1/t6"' (.062")
Square
Groove
1/16'" (.062")
I20.170
95-135
10
1/16" (.062")
1/t6"' (.062")
Fillet
1/16"" (.062")
t20-t70
95-135
10
1/16" (,062")
3/32" (.093")
Square
Groove
3/32" (,093")
t70.200
135-I75
10
3/32" (.093")
3/32" (.093')
Fillet
3/32
(.093")
t70-200
135-!75
t0
3/32" (.093")
t/8'
(.125")
Square
Groove
3/32" (.093-)
180-200
145-200
12
1/8
(.125")
1/8'" (,t25")
Filiet
3/32-(.093")
t80-200
145-200
12
118" (.125")
ALUMINUM
ALLOYS
AC-HF
DC-SP
TUNGSTEN
WELDING
WELDING
SHIELDING
FILLER
METAL
TYPE OF
ELECTRODE
CURRENT
CURRENT
GAS*ARGON
ROD
THICKNESS
WELD JOINT
DIAMETER
(AMPS)
(AMPS)
CU, FT,/HR,
DIAMETER
3/64" (,046')
Square
Groove
1/16" (,082")
40-60
--
20
1/16" (,062")
1/t6"
(.062")
Square
Groove
3/32" (.093")
70.90
--
20
3/32" (,093")
!/16"
(.062")
Filter
3/32" (,093")
70-90
--
t5
3/32" (,093")
3/32" (,093")
Square
Groove
3/32" (.093")
90-1t5
--
20
3/32" (,093")
3/32" (.093")
Fiilet
3/32-(.093")
90-1t5
--
t5
3/32'" (,093"')
t/8"
(,t25")
Square
Groove
3/32- (,093")
115-140
--
20
t/8"
(,125"')
1/8" (,t25")
Fittet
3/32" (,093-)
t15-140
--
20
1/8" (,125")
3/t6"
(.187")
Vee Groove
1/8" (.125")
i90-200
--
20
1/8" (,125")
11
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