What is the consequence of using too much shielding gas during welding?

Using too much shielding gas during welding can lead to excess spatter, which can negatively impact the quality of the weld. Shielding gas is essential for protecting the weld pool from atmospheric contamination; however, if it is allowed to flow too abundantly, it can disrupt the arc stability and create turbulence in the weld pool. This turbulence can force molten metal out of the weld area, resulting in spatter. Excess spatter not only affects the aesthetic appearance of the weld but can also lead to further clean-up work and even affect the integrity if enough spatter accumulates.

Understanding the function of shielding gas helps clarify this consequence. An optimal flow rate ensures that the weld area is adequately protected without causing disruption. If the flow is excessive, it can result in the negative effects observed, such as increased spatter, rather than improving penetration or causing weld porosity or scorch marks, which are associated with different welding issues.