Shielding gas is provided from the weld gun in order that the weld pool doesn't communicate with ambient air, oxidizing the weld place. If oxygen interacts Using the weld area, your do the job will cause too much spatter and inconsistent welds. ∂ v → ∂ t + ( v → ∗ ▽ ) v → = − one ρ ▽ P + v ▽ v → + β g → Δ T displaystyl