Foundation, Concrete and Earthquake Engineering

What is Low Hydrogen Welding Electrodes?

In AWS A5.1, the electrodes listed include both low hydrogen and non-low hydrogen electrodes. In AWS D1.1-96, Group I steels may be welded with non-low hydrogen electrodes. This would include A36 steel. For Group II steels and higher, low hydrogen electrodes are required. These steels would include A572 grade 50. That means for welding on steels with minimum specified yield strengths exceeding 50 ksi, all electrodes should be of the low hydrogen type with specific coatings that are designed to be extremely low in moisture. Water, or H2O, will break down into its components hydrogen and oxygen under the intensity of the arc. This hydrogen can then enter into the weld deposit and may lead to unacceptable weld heat affected zone cracking under certain conditions. Low hydrogen electrodes have coatings comprised of materials that are very low in hydrogen.
Pipe line Welding with Low Hydrogen Welding Electrode
Low Hydrogen Welding Electrode
The low hydrogen electrodes that fit into the A5.1 classification include E7015, E7016, E7018, and E7028.
Operate on DC only
Operate on either AC or DC
Operate on AC or DC and include approximately 25% iron powder in their coatings; this increases the rate at which metal may be deposited
Contains approximately 50% iron powder in the coating, enabling it to deposit metal at even higher rates. However, this electrode is suitable for flat and horizontal welding only.

vertical up welding with Low Hydrogen Welding Electrode
vertical-up welding with Low Hydrogen Welding Electrode

For most structural steel fabrication today, low hydrogen electrodes are prescribed to offer additional assurance against hydrogen induced cracking. When low hydrogen electrodes are used, the required levels of pre heat are actually lower, offering additional economic advantages to the contractor.

All the low hydrogen electrodes listed in AWS A5.1 have minimum specified notch toughnesses of at least 20 ft. lb. at 0°F. There are electrode classifications that have no notch toughness requirements (such as E6012, E6013, E6014, E7024) but these are not low hydrogen electrodes. Although there is no direct correlation between the low hydrogen nature of various electrodes and notch toughness requirements, in the case of SMAW electrodes in A5.1, the low hydrogen electrodes all have minimum notch toughness requirements.


  1. Thank you for the explanation as to how it is done. I lot of us have only seen it but dont really have and idea as to how is the working.
    welding helmet

  2. Very interesting article about welding electrodes and how to work on it..
    Welding Electrode Plant

  3. Hi,

    Your post really helped me to understand what is Low Hydrogen Welding Electrodes?. It has great details and yet it is easy to understand.
    That's what i was looking for. I will definitely share it with others.

  4. sharing these kinds of information helps us to look forward
    Welding electrode production machine

  5. Parag Traders in early 1980 in the GIDC of Vatva, Ahmedabad by Mr. Parag Mashruwala. We commence our business with the focus to cater to the requirement of Welding Electrodes, Equipments and Accessories to various industries specializing in Fabrication, Machine Shop, Forging and Castings in Ahmedabad.

    Welding Electrodes in India | Welding Electrodes Dealers in India

    Welding Equipments Dealer in india | Welding Machine in India

  6. For the welder who is also a hunter, outdoorsman or soldier at heart, JACKSON SAFETY Brand presents the REALTREE™ Camouflage welding helmet. painted welding helmet for sale

  7. The essential part of welding. I think used by almost every welders.

  8. Nice blog shared here. If anyone looking for steel fibre for precast then contact Precision Drawell. Thanks for sharing.