Low-Hydrogen Electrode Storage and Baking Guide
Low-hydrogen electrodes like E7018, E7018-1, and E7016 are the most moisture-sensitive consumables in welding. Their flux coatings are designed to deposit very little hydrogen in the weld, which prevents cracking in thick sections and high-strength steels. But this only works if the rods stay dry. Moisture absorbed into the coating releases hydrogen during welding, defeating the entire purpose of using a low-hydrogen rod.
Why Moisture Matters
Hydrogen is the smallest atom. It dissolves easily into molten steel and can migrate through the heat-affected zone after the weld cools. In thick sections or high-strength steels, this dissolved hydrogen causes delayed cracking, sometimes called cold cracking or hydrogen-induced cracking (HIC). Cracks may not appear for hours or days after welding.
Low-hydrogen electrodes have coatings formulated to keep diffusible hydrogen below specific thresholds. H4 means 4 mL or less per 100g of weld metal. H8 means 8 mL or less. The R suffix (as in H4R) means the coating resists moisture absorption better than standard rods. But even H4R rods will absorb moisture if left exposed long enough.
Storage Requirements
Unopened hermetically sealed cans can be stored at room temperature for years. The seal prevents moisture ingress.
After opening, rods must go into a rod oven set at 250-300F (120-150C). This is non-negotiable for code work. Many shops keep a rod oven running continuously and pull rods as needed.
Maximum atmospheric exposure depends on the hydrogen designation. H4R rods can be out of the oven for up to 4 hours before they need reconditioning. H8 rods allow 9 hours. Standard (non-R) H4 rods may allow only 1-2 hours.
Reconditioning Procedures
If rods have been exposed to moisture beyond the allowed time, they must be reconditioned (baked) before use.
Standard reconditioning: 700F (370C) for 1 hour. This drives out absorbed moisture from the coating.
Maximum reconditioning cycles: Most manufacturers allow 1-3 reconditioning cycles. After that, the coating chemistry may degrade and the rods should be discarded.
Never recondition in a kitchen oven. Most kitchen ovens do not reach 700F reliably, and the fumes from electrode coatings are not food-safe.
Practical Tips
If you are a hobbyist who only welds occasionally, buy 7018 in small sealed containers (1-5 lb). Use what you need and discard the rest rather than investing in a rod oven.
For job sites, portable rod ovens that hold 10-20 lbs are available from Lincoln, Phoenix, and others. They run on 120V and keep rods at proper holding temperature.
If you suspect moisture contamination, look for porosity in test welds. Scattered gas pores in the weld bead are a telltale sign of hydrogen from wet rods.
The cost of a rod oven is far less than the cost of a cracked weld on a structural connection.
Low-Hydrogen Electrode Storage and Baking Guide: Common Questions
What temperature to bake E7018 rods?
E7018 rods require two different temperatures depending on the situation. For holding (keeping dry rods dry after opening the sealed package), set the rod oven to 250-300F (120-150C). For reconditioning (drying out rods that have been exposed to moisture beyond the allowed time), bake at 700-800F (370-425C) for one hour per AWS D1.1. Never exceed the manufacturer's maximum reconditioning temperature, as excessive heat can damage the flux coating chemistry. Always check the specific manufacturer datasheet for your brand of E7018, as Lincoln, ESAB, and Hobart each publish slightly different recommendations. See the full E7018 specifications for polarity, amperage, and position ratings.
How long can E7018 rods be out of the oven?
Per AWS D1.1, E7018 rods with an H4R moisture-resistant designation can be out of the rod oven for a maximum of 4 hours before they must be reconditioned. Standard (non-R) low-hydrogen rods may have shorter exposure limits of 1-2 hours depending on the hydrogen designation. H8-designated rods allow up to 9 hours. After exceeding the allowed exposure time, rods must be reconditioned at 700-800F for one hour before use on code work. For non-code shop work, many welders extend these limits, but the welds will not meet structural welding code requirements. Moisture-contaminated rods cause porosity and hydrogen cracking. See the welding defects and causes guide for diagnosis.
Can you rebake E7018 rods more than once?
Yes, but with limits. Most manufacturers allow E7018 rods to be reconditioned up to 3 times at 700-800F. After repeated reconditioning cycles, the flux coating chemistry can degrade, potentially affecting arc stability, slag coverage, and the low-hydrogen properties the rod is designed to deliver. Lincoln Electric and ESAB both publish reconditioning limits in their product datasheets. If rods have been reconditioned the maximum number of times, discard them. For code work governed by AWS D1.1, always follow the specific manufacturer's reconditioning guidelines for the brand of rod you are using.
Reference data only. Verify all settings against manufacturer documentation and the applicable welding code before use. Amperage ranges are starting points that vary by position, fit-up, and material. Welding involves serious injury risks including burns, electric shock, fume exposure, and fire. This site does not replace proper training, certification, or employer safety procedures. See full terms of use.
Classification system defined by AWS A5.1, Lincoln Electric, ESAB technical bulletins.