AWS A5.1 E7018-H4R : IRMA SH-7018
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AWS A5.1 E7018-H4R : IRMA SH-7018

Characteristics

IRMA SH‑7018 is a premium basic (low‑hydrogen) electrode designed for welding carbon steels and low‑alloy steels where high toughness, crack resistance, and reliable mechanical properties are required. The H4R designation indicates diffusible hydrogen ≤ 4 ml/100 g deposited weld metal and enhanced moisture resistance for shop and field conditions.

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Application & Base materials
Structural fabrication, bridges, buildings, offshore and onshore structures, Pressure vessels, boilers, and piping (mild & low‑alloy steels), Shipbuilding, heavy equipment, and general fabrication. IRMA SH-7018 is suitable for welding low carbon steels or mild steels, including but not limited to: (ASTM: A36, A283, A285, A569, A570); (JIS: SS400, SPHC, SPCC, S20C); (DIN/EN: S235JR, S275JR, RSt37-2)
Typical analysis of all weld metal (Wt.-%)
C Si Mn P S
0.07 0.45 1.15 0.02 0.02
Mechanical properties of the weld metal
Condition Tensile strength
[MPa]		 Yield Strength
[MPa]		 Elongation
[%]		 Impact strength
-30 ºC [Joule]
As Welded 490 – 660 ≥ 440 ≥ 22 ≥ 47
Welding Position & Guideline
Polarity
DC (+)
Re-dry : 300 – 350 ºC .
Keep a short arc length; use stringer beads for best toughness
For vertical‑up, weave width ≤ 2.5 × electrode diameter
Remove all slag between passes; maintain interpass temperature per WPS
Size, Packing and Recommended welding parameters
Size (mm)
Inner pack (KG)
Kg / Outer Box
 Amperage (A)
Flat / Horizontal Vertical Up
2.60 x 350 5.0 20.0 70 – 100 60 – 90
3.20 x 350 5.0 20.0 90 – 130 80 – 120
4.00 x 400 5.0 20.0 130 -180 110 -160
5.00 x 400 5.0 20.0 180 -240 160 -210
Approvals
ABS ( 3YSM); BKI (3YSM)
08/2025 Rev.0
www.intiroda.co.id

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