Description
SQ-7018 is a general purpose, low hydrogen electrode for welding 490MPa class high tensile steel. E7018 has a very good deposition rate, producing steady arc with low spatter and medium penetration.
Key Features
Improved coating integrity
Extreme bendability
60% less moisture pickup vs. competition
Reduction of arc starting porosity
Clear puddle and a smooth arc
DEPOSIT COMPOSITION(1)
|
|
%C
|
%Mn
|
%Si
|
%P
|
%S
|
%Ni
|
|
Requirements - AWS E7018 H4R
|
0.15 max.
|
1.60 max.
|
0.75 max.
|
0.035 max.
|
0.035 max.
|
0.30 max.
|
|
Typical Results(3)
|
0.03-0.08
|
1.01-1.55
|
0.34-0.68
|
0.01-0.02
|
≤ 0.01
|
0.01-0.06
|
|
|
%Cr
|
%Mo
|
%V
|
%Mn + Ni + Cr
+ Mo + V
|
Diffusible Hydrogen (mL/100g weld metal)
|
|
Requirements - AWS E7018 H4R
|
0.20 max.
|
0.30 max.
|
0.08 max.
|
1.75 max.
|
4.0 max.
|
|
Typical Results(3)
|
0.02-0.07
|
≤ 0.05
|
≤ 0.02
|
1.04-1.75
|
2-3
|
TYPICAL OPERATING PROCEDURES
|
Current (Amps)
|
|
Polarity(4)
|
3/32 in (2.4 mm)
|
1/8 in (3.2 mm)
|
5/32 in (4.0 mm)
|
3/16 in (4.8 mm)
|
7/32 in (5.6 mm)
|
1/4 in (6.4 mm)
|
|
DC+
|
70-110
|
90-160
|
130-210
|
180-300
|
250-330
|
300-400
|
|
AC
|
80-120
|
100-160
|
140-210
|
200-300
|
270-370
|
325-420
|
(1)Typical all weld metal. (2)Measured with 0.2% offset. (3)See test results disclaimer on pg. 18. (4)Preferred polarity is listed first.
MECHANICAL PROPERTIES
|
|
Yield Strength
|
Tensile Strength
|
Elongation
|
Charpy V-Notch J (ft•lbf)
|
|
|
MPa (ksi)
|
MPa (ksi)
|
%
|
-29°C (-20°F)
|
|
Requirements - AWS E7018
|
400 (58) min.
|
490 (70) min.
|
22 min.
|
27 (20) min.
|
|
Typical Results - As-Welded
|
430-510 (62-74)
|
510-605 (74-88)
|
25-37
|
121-332 (89-246
|
Welding Positions
All, except vertical down
DIAMETERS / PACKAGING
|
Diameter
|
Length
|
|
in
|
(mm)
|
in (mm)
|
|
3/32
|
(2.4)
|
14 (350)
|
|
1/8
|
(3.2)
|
14 (350)
|
|
5/32
|
(4.0)
|
14 (350)
|
|
3/16
|
(4.8)
|
14 (350)
|
|
7/32
|
(5.6)
|
18 (450)
|
|
1/4
|
(6.4)
|
18 (450
|
Conformances
AWS A5.1/A5.1M: 2004 ASME SFA-A5.1:
ABS:
Lloyd’s Register: DNV Grade:
GL:
BV Grade: CWB/CSA W48-06:
Typical Applications
Power generation
Petrochemical
Pressure vessels
Pressure piping
Mild stee
CONTACT US
Contact : Mrs Alice Chai
Tel:0086-311-82265888 EXT 801 0086-311-82267598 EXT 801
Whatsapp online :0086-13673135771
Email: alice@sqhc.com.cn QQ:530689384
Trade Manager: CN200837012
