What can result from using an incorrect shielding gas mixture?

Using an incorrect shielding gas mixture can lead to increased oxidation of the weld. Shielding gas plays a crucial role in preventing contamination of the weld pool during the welding process. If the shielding gas is not properly selected or mixed, it may not effectively protect the molten weld metal from atmospheric gases, particularly oxygen and nitrogen. This exposure can result in various defects such as oxidation, which manifests as a discolored or brittle weld.

In contrast, the other options highlight outcomes that depend on the correct use of shielding gases. Proper shielding gas mixtures can enhance weld aesthetics by ensuring a clean and even finish, improve arc stability by maintaining a consistent shield around the weld pool, and contribute to stronger weld integrity by minimizing defects. Therefore, using the right shielding gas mixture is essential for achieving high-quality welds free from oxidation and other detrimental effects.