Esab E7018 H4R Welding Rod 2.5mm Vacuum Packed

FAQs

What is the difference between E7018 and E7018-1 H4R?

E7018-1 has tighter notch toughness requirements than standard E7018, requiring a minimum CVN impact value of 27J at -46°C. The H4R suffix certifies that diffusible hydrogen in the weld metal is ≤4 ml per 100g of deposited weld metal under AWS A5.1, and the R indicates moisture-resistant coating that maintains this classification after atmospheric exposure for 9 hours. This makes E7018-1 H4R the preferred choice for critical structural, offshore, and code-governed applications.

What does H4R stand for on a welding rod?

H4 indicates the electrode produces ≤4 ml of diffusible hydrogen per 100g of deposited weld metal — the lowest hydrogen designation under AWS A5.1. The R suffix (Resistant) means the coating has been tested to maintain this hydrogen level after 9 hours of atmospheric exposure at 27°C and 80% relative humidity, eliminating the need for immediate re-baking after opening the pack.

What amps should be used for E7018 H4R 2.5mm?

For a 2.5mm E7018-1 H4R electrode, the typical welding current range is 70–100A DC+ (DCEP). The lower end suits thin sections and root passes; the higher end suits fillet welds and fill passes. Always refer to the manufacturer’s datasheet for the exact recommended parameters.

Is E7018 AC or DC?

The ESAB E7018-1 H4R is designed for DC+ (DCEP — Direct Current Electrode Positive). While some E7018 variants support AC, the H4R classification is typically qualified on DC only, which is standard for offshore, structural, and oil & gas welding applications.

What is the difference between 7018 and 7018 H4R?

Standard E7018 does not carry a hydrogen designation or moisture-resistant coating requirement. E7018 H4R adds both: a certified diffusible hydrogen level of ≤4 ml/100g and a moisture-resistant coating. This is mandatory in many oil & gas, structural, and offshore specifications (such as AWS D1.1, API 1104, and ASME Section IX) where hydrogen-induced cracking must be controlled.

Does E7018 require re-baking before use?

The vacuum-packed ESAB E7018-1 H4R does not require re-baking when the pack is freshly opened, provided electrodes are used within the recommended atmospheric exposure time (9 hours under the H4R R-rating). Opened packs should be stored in a rod oven at 65–150°C if not fully used. This is one of the primary advantages of vacuum packaging over foil or cardboard-packed alternatives.

What is the E7018-1 H4R electrode used for in oil and gas?

In oil and gas construction, E7018-1 H4R is used for structural steel fabrication, pressure vessel welding, pipeline tie-ins, equipment skid fabrication, and offshore structural connections. The H4R classification is often mandatory under project welding procedures (WPS) governed by codes such as ASME IX, AWS D1.1, or API 1104 to prevent hydrogen-induced cold cracking in critical welds.