Which electrode type is recommended to prevent hydrogen-induced cracking?

Which electrode type is recommended to prevent hydrogen-induced cracking?

• A. Low-hydrogen electrodes.
• B. High-hydrogen electrodes.
• C. Self-shielded flux-cored electrodes.
• D. Electrodes with high sulfur content.

Answer: (A)

Hydrogen-induced cracking happens when hydrogen released during welding diffuses into the metal and cracks as the weld cools, especially in high-strength steels. To prevent this, you want to minimize the hydrogen that can be absorbed into the weld metal. Low-hydrogen electrodes are designed to deposit weld metal with very little diffusible hydrogen, so they drastically reduce the chance of HIC. That’s why they are the recommended choice for preventing hydrogen-induced cracking. In contrast, high-hydrogen electrodes introduce more hydrogen into the weld area, increasing the risk of HIC. Self-shielded flux-cored electrodes can also contribute more hydrogen under certain conditions, and electrodes with high sulfur content tend to embrittle welds and aren’t effective at preventing hydrogen cracking.

Hydrogen-induced cracking happens when hydrogen released during welding diffuses into the metal and cracks as the weld cools, especially in high-strength steels. To prevent this, you want to minimize the hydrogen that can be absorbed into the weld metal. Low-hydrogen electrodes are designed to deposit weld metal with very little diffusible hydrogen, so they drastically reduce the chance of HIC. That’s why they are the recommended choice for preventing hydrogen-induced cracking.

In contrast, high-hydrogen electrodes introduce more hydrogen into the weld area, increasing the risk of HIC. Self-shielded flux-cored electrodes can also contribute more hydrogen under certain conditions, and electrodes with high sulfur content tend to embrittle welds and aren’t effective at preventing hydrogen cracking.