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

Application

LPG tankers
LPG storage tanks
Equipment for low-temperature service

Remarks

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

Technical Data

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
Current Amp	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.