What type of flux does NOT easily transfer oxygen to the weld metal?

Basic flux is designed to have a low affinity for oxygen, which is a key characteristic that allows it to effectively protect the weld metal from oxidation during the welding process. The primary purpose of the flux is to create a protective barrier that minimizes the contact between the molten weld metal and the surrounding atmosphere, thus preventing the incorporation of unwanted elements, including oxygen.

Basic flux compositions generally include compounds such as calcium carbonate or sodium carbonate, which help to lower the oxygen levels in the weld pool. This contributes to a lower risk of weld defects such as porosity and slag inclusion, leading to a higher quality weld.

In contrast, other types of flux, such as fused and rutile, can have higher oxygen transfer rates, which may not provide the same level of protection against oxidation. Alkaline flux may also allow for some oxygen transfer depending on its specific formulation, but basic flux remains the most effective in minimizing oxygen transfer to the weld metal, making it the preferred choice for achieving strong, sound welds.