|
TABLE 2. Vertical Down Pipe Welding Electrodes
|
AWS
Class API 5L
STRENGTH LEVELS |
| |
X42
|
X46
|
X52
|
X56
|
X60
|
X65
|
X70
|
X80
|
|
ROOT
|
PASS
|
|
|
|
|
|
|
|
|
E6010
|
X
|
X
|
X
|
|
|
|
|
|
|
E7010G
|
|
|
X
|
X
|
X
|
X
|
|
|
|
E8010G
|
|
|
|
X
|
X
|
X
|
X
|
X
|
|
E71T-13H8
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
|
HOT
|
FILL
|
AND
|
CAP
|
PASSES
|
|
|
|
|
|
E6010
|
X
|
X
|
X
|
|
|
|
|
|
|
E7010G
|
|
|
X
|
X
|
X
|
X
|
|
|
|
E7010G
|
|
|
X
|
X
|
X
|
X
|
X
|
|
|
E71T8-K6
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
|
|
E91T8-G
|
|
|
|
|
|
|
|
X
|
|
Notice in the above table that only the
self shielded arc welding process is recommended for the welding
of X80 once the root and hot passes are completed
|
Both processes are capable of delivering properties which meet or
exceed the minimum properties specified for the parent steels, which
is all that most governing codes require. Here are a few test results
for two pipe grades run with the typical pipe joint detail shown
in Figure 3.
|
|
TABLE 3. .720 in (18 mm) Grade 5LX70 Results
|
|
Pipe Properties
|
Tensile (ksi)
|
Yield (ksi)
|
|
Specified
|
82
|
70
|
|
Actual
|
113
|
90
|
|
Weld (E8010-G)
|
|
|
|
Actual
|
83
|
77
|
CVN-37 ft-lb @ -50° F
(50 joules @ -46° C)
|
|
|
|
|
TABLE 4. .70 in (18 mm) Grade 5LX80 Results
|
|
Pipe Properties
|
Tensile (ksi)
|
Yield (ksi)
|
|
Specified
|
90-120
|
80
|
|
Actual
|
|
|
|
Weld (E91T-8-G)
|
|
|
|
Reduced Section Tensile
|
96
|
|
CVN 76 ft-lb @ -40° F
(103 joules @ -40° C)
|
|
|
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|
