What is the result of increased nitrogen content in the final weld deposit?

Increased nitrogen content in the final weld deposit typically leads to porosity. This phenomenon occurs because nitrogen can dissolve in the molten weld pool and, upon cooling, form nitrogen gas bubbles that get trapped within the solidifying metal. This trapping results in voids, or pores, which can significantly weaken the weld.

Porosity not only affects the mechanical properties of the weld but can also lead to issues such as reduced ductility and potential failure under stress. It's a critical factor that welders and metallurgists must control to maintain the integrity of the welded structure.

Understanding this relationship emphasizes the importance of monitoring the composition of the filler materials and the base metals used to reduce nitrogen levels and mitigate the risk of porosity in welds.