SHIELD METAL ARC WELDING (SMAW)

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N-7018-1

Specification
AWS Specification: AWS A5.1 E7018-1 H4R
JIS Specification: N/A
Other Specification: N/A
Description
  • N-7018-1 is an iron powder extra-low hydrogen type covered electrode to be used in all-position welding of 400 - 490 kgf/mm2 high tensile steel for low-temperature application
  • Provides excellent notch toughness at low-temperatures and good usability 
TYPICAL CHEMICAL COMPOSITION OF ALL WELD METAL DEPOSITS (%):

C

Si

Mn

P

S

0.

0.18

0.45

0.014

0.005

 

TYPICAL MECHANICAL PROPERTIES OF ALL WELD METAL DEPOSITS:
Yield Point
N/mm2 (KSI)
 
Tensile Strength
N/mm2 (KSI)
 
Elongation
%
 
Impact Value
°C, J (°F, Ft-Lbs)
 

540  (78)

600 (87)

30

-46°, 115  (-51°, 85)

 

SIZE AND RECOMMENDED CURRENT RANGE: AC, DC (+)

DIAMETER (mm)

2.5

3.2

4.0

5.0

LENGTH (mm)

350

350

400

450

Current Amp

Flat

55 - 85

90 - 120

120 - 170

170 - 200

Vertical Overhead

50 - 80

80 - 110

100 - 160

140 - 190

Welding Positions: ALL POSITIONS
Approvals: ABS

NOTE:

The information contained or otherwise referenced herein is presented only as “typical” without guarantee or warranty, and Industrial Welding Corporation expressly disclaims any liability incurred from any reliance thereon. Typical data and test results for mechanical properties, deposit, or electrode composition and other properties were obtained from a weld produced and tested according to prescribed standards and should not be assumed to be the expected results in a particular application or weldment. Actual results will vary depending on many factors, including, but not limited to, weld procedure, plate chemistry and temperature, weldment design, and fabrication methods. Users are cautioned to confirm by qualification testing, or other appropriate means, the suitability of any welding consumable and procedure before use in the intended application.

  • LPG tankers
  • LPG storage tanks
  • Equipment for low-temperature service
  • Welding heat input must be controlled in order to get required impact value since notch toughness tends to decrease by excessive heat input
  • Preheating at 50-100°C is needed depending upon the kind of steel and its thickness
  • Dry the electrodes at 350-400°C for about one hour before use
  • Take the backstep method or strike the arc previously on a small steel piece to prevent blowholes at the arc striking in a groove

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