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Specification: Si MN P S 0.08 0.56 1.02 0.013 0.010

N-7018 is an iron powder low hydrogen electrode containing iron powder in the coating flux. It provides high deposition rates and excellent mechanical properties, crack resistance, and X-ray quality. It has good weldability with a smooth arc and is used to weld high tensile strength steels for ships, bridges and pressure vessels. The arc length should be 1/16 inches or less to achieve good properties, and a backstep or short arc start is recommended to prevent blowholes. It has typical mechanical properties of yield strength of 510 MPa, tensile strength of 580 MPa and 30% elongation.

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120 views2 pages

Specification: Si MN P S 0.08 0.56 1.02 0.013 0.010

N-7018 is an iron powder low hydrogen electrode containing iron powder in the coating flux. It provides high deposition rates and excellent mechanical properties, crack resistance, and X-ray quality. It has good weldability with a smooth arc and is used to weld high tensile strength steels for ships, bridges and pressure vessels. The arc length should be 1/16 inches or less to achieve good properties, and a backstep or short arc start is recommended to prevent blowholes. It has typical mechanical properties of yield strength of 510 MPa, tensile strength of 580 MPa and 30% elongation.

Uploaded by

Jennylyn Daño
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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10/11/2019 N-7018 - Printer Friendly Layout

N-7018
Specification
AWS Specification: AWS A5.1 E7018
JIS Specification: D5016
Other Specification: DIN E51 53 B 10

Description

N-7018 is an iron powder low hydrogen type electrode containing


large amounts of iron powder in coating flux to give higher
deposition rates
Deposited metal demonstrates excellent mechanical properties,
crack resistance, and X-ray quality
Good weldability, such as smooth and stable arc, easy slag
removal, low spatters, and nice bead appearance

Application

Welding of 50 kgf/mm2 high tensile strength steels for ships, steel


frames, bridges, and pressure vessels

Remarks

Require a drag to 1/16 inches maximum arc length to obtain the


desired mechanical properties and weld quality
An arc length of 1/8 inch or longer may result in porosity and
serious deterioration of impact properties
Take the backstep method or strike the arc on a small steel plate
prepared for this particular purpose to prevent blowholes at the arc
starting
Polarity: Use DC (+) whenever possible with 4.0mm and smaller
sizes

Technical Data

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

C Si Mn P S
0.08 0.56 1.02 0.013 0.010

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10/11/2019 N-7018 - Printer Friendly Layout
TYPICAL MECHANICAL PROPERTIES OF ALL WELD METAL DEPOSITS:

Yield Point Tensile Strength Elongation Impact Value


N/mm2 (KSI) N/mm2 (KSI) % °C, J (°F, Ft-Lbs)

510 (74) 580 (84) 30 -29°, 145


(-20°, 107)

TYPICAL DIFFUSIBLE HYDROGEN OF WELD METAL:

Diameter Current (amp) Re-drying Diffusible


(mm) Condition Hydrogen Mean
Value
(cc./100g)

4.0 AC 350ºC x 3.0


0.5 hrs.

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

DIAMETER (mm) 2.5 3.2 4.0 5.0 6.0


LENGTH (mm) 350 350 400 450 450

Current Flat 70 - 100 100 - 150 - 190 - 250 - 320


Amp 140 200 240
Vertical & 60 - 90 80 - 120 120 - 140 - -
Overhead 160 180

ALL POSITIONS EXCEPT VERTICAL


Welding Positions: DOWN
Approvals: ABS, BV, DNV, LRS, NKK

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.

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