Low Hydrogen

JACKSUN 18 SPECIAL H4R

AWS A5.1: E7018 H4R

Premium low-hydrogen, iron-powder type electrode designed for critical structural welds.
H4R rating indicates extra-low diffusible hydrogen (≤ 4 ml/100 g weld metal) and suitability for high-strength steel and restrained joints.
Provides excellent crack resistance and impact toughness even at low temperatures (-30 °C and below).
Ideal for bridges, offshore structures, pipelines, tanks, shipbuilding, and heavy fabrication.
Operates on AC and DC+ polarity.

1. Typical Chemical Composition of Weld Metal (% by weight)

C	Mn	Si	S	Ni	Cr	P	Mo	V
≤ 0.15	≤1.60	≤ 0.90	≤ 0.030	0.30	0.20	≤ 0.035	0.30	0.08

2. Typical Mechanical Properties of Weld Metal

Property	UTS (MPa)	Yield Strength (MPa)	Elongation (%)	Impact Toughness (J @ -30 °C)	Diffusible Hydrogen (ml/100 g)
Typical Values	520 – 570	430 – 480	24 – 32	60 – 80	2 – 4

3. Dimension, Current Condition & Packing Data (SMAW Welding)

Size (mm)	Size (inch)	Current Range (A)	Polarity	Voltage (V)	Packing (5 kg)	Packing (20 kg)
2.5	3/32	70 – 100	AC / DC+	20 – 22	✔	✔
3.2	1/8	90 – 140	AC / DC+	22 – 24	✔	✔
4.0	5/32	130 – 190	AC / DC+	24 – 26	✔	✔
5.0	3/16	180 – 250	AC / DC+	26 – 28	✔	✔

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