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NIHONWELD N-7018-1
AWS Specification: AWS A5.1 E7018-1
JIS Specification:

NONE

Other Specification:

I. APPLICATIONS:

Shielded metal arc welding for LPG tankers, LPG storage tanks, equipment for low-temperature service,

II. DESCRIPTIONS :

An iron powder extra-low hydrogen type covered electrode to be used in all-position welding of 400-490N/mm2 high tensile steel for low-temperature application. It provides excellent notch toughness at low-temperatures and good usability .

III. NOTES ON USAGE :

  • Welding heat input must be controlled in order to get required impact value, since notch toughness tends to be decreased 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.

IV. TYPICAL CHEMICAL COMPOSITION OF ALL-WELD METAL DEPOSITS (%):

 

C

Si

Mn

P

S

0.08

0.53

1.43

0.009

0.005

V. TYPICAL MECHANICAL PROPERTIES OF WELD METAL:

 

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)

VI. WELDING POSITIONS: ALL POSITIONS

VII. SIZES & RECOMMENDED CURRENT RANGE: AC or DC (+) 

 

Diameter, mm

Length, mm

2.5

350

3.2

350

4.0

400

5.0

450

Current,

A

F

55-85

90-120

120-170

170-200

V, OH

50-80

80-110

100-160

140-190

 APPROVAL: ABS

TEST RESULT

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.