What is a common result of hydrogen in the molten weld?

• A. Cracking
• B. Porosity
• C. Weak joint
• D. Excessive spatter

Answer: (B)

The presence of hydrogen in the molten weld typically leads to porosity. Porosity occurs when gas bubbles are trapped in the solidifying weld metal, forming small voids or cavities that can weaken the integrity of the weld. Hydrogen can be absorbed during the welding process from various sources, including moisture in the filler material or contamination on the surfaces being welded.

When the weld metal solidifies, the hydrogen may not have enough time or room to escape, leading to these unwanted gas pockets. Porosity results in reduced mechanical properties such as strength and ductility and can also impact fatigue resistance. Therefore, managing the hydrogen levels in the welding environment is crucial to producing high-quality, defect-free welds.