Welding Inspection & Metallurgy API ICP Self Study Notes

11.2.1 Electrode Considerations
Hot tap and in-service welding operations should be carried out only with lowhydrogen
consumables and electrodes (e.g., E7016, E7018 and E7048).
Extra-low-hydrogen consumables such as Exxxx-H4 should be used for
welding carbon steels with CE greater than 0.43% or where there is potential
for hydrogen assisted cracking (HAC) such as cold worked pieces, high
strength, and highly constrained areas.