E7018-H4R

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Class: E7018-H4R
AWS: A5.1

Certificate of Conformance DM7018-H4R

Conforms to Certification:  AWS A5.1 | ASME SFA 5.1

Weld Process: Shielded Manual Metal Arc Electrodes

AWS Chemical Composition Requirements
C = 0.10 max Ni = 0.30 max
Mn = 0.80 – 1.60 Cr = 0.20 max
Si = 0.75 max Mo = 0.30 max
P = 0.030 max V = 0.08 max
S = 0.030 max

Description:

DuraMax E7018 H4R is a moisture resistant, hydrogen controlled, vacuum packed, basic coated electrode which is welder friendly and is recommended for welding of mild and medium carbon steel, high strength steel, cast steel and problematic steels. The electrode is vacuum packed and hence does not require expensive redrying at 250°C for 2 hours or a higher temperature. The weld metal is clean and has lowest level of impurities thus having unique properties of resistance to ageing.

Typical Application & Usage:
  • All maintenance applications including welding of all types of carbon-manganese steels, high tensile, heavy structures, plants and subject to static or dynamic loading.
  • It can be used as a buffer layer before hard facing.
RE-DRY CONDITIONS: No need of drying. The electrodes are vacuum packed hence can be used straight on the job.
 Diffusible Hydrogen: < 4ml / 100gm weld metal
Deposited All Weld Metal Properties % (Typical) As Welded
Tensile Strength 520 – 600 MPa
Yield Strength 450 – 520 MPa
Elongation in 2″ 24 – 32%
CVN Impacts (J) @ -40°C  > 60
Recommended Welding Parameters
Diameter Amperage
3/32″     70 – 100
1/8″   100 – 130
5/32″   140 – 190
 3/16″  190 – 240

POLARITY: DCEP or AC 70V
DCEP: DC, Electrode Positive (reverse polarity) has the most weld penetration
AC: medium weld penetration (can be more spatter)
WELDING POSITIONS: Flat, Horizontal, Overhead, Vertical-up and Vertical-down positions
USE LESS AMPS ON THIN METAL; MORE AMPS ON THICK METALS