What is the purpose of the shielding atmosphere in atomic hydrogen welding?

The purpose of the shielding atmosphere in atomic hydrogen welding is to protect welds from contamination. In this welding process, an arc is established between two tungsten electrodes, which ionizes the hydrogen and creates a protective atmosphere around the weld pool. This shielding is essential because it prevents the introduction of impurities from the surrounding air, such as oxygen and nitrogen, which can adversely affect the quality of the weld. Contaminants can lead to defects such as porosity, which compromises the integrity and strength of the weld. By ensuring a clean environment, the shielding aids in producing high-quality welds with superior mechanical properties.