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This welding utilizes an active gas mixture as shielding gas. For example, a suitable mixture of carbon-di-oxide (CO2) and oxygen (O2) along with other comparatively stable gases like argon, helium, nitrogen, etc. Besides fulfilling basic requirement of shielding gas, such active gases can break down due to arc heating and subsequently induce various chemical elements on weld bead that can enhance joint properties. It also contributes in stabilizing arc, reducing