Shielding Gases For Aluminum Mig Welding. How to avoid porosity in Aluminum welding. MIG shielding gas displaces air in the weld zone to create an environment that supports the desired weld characteristics.
How to avoid porosity in Aluminum welding. The main purpose of using shielding gas for MIG welding is to protect the welding area from airborne gases like oxygen nitrogen hydrogen propane etc. Generally you will be using a pure argon shielding gas when you are MIG welding aluminum.
You can choose aluminum to MIG weld with Self-Shielded Flux-Cored Arc Welding FCAW-S wires.
Inert gasses used for MIG welding are Argon and Helium. Pure argon is the preferred shielding gas for welding thin sections of aluminum. The gasses used are what shield the weld from the air that causes weld defects such as porisity. In almost all cases the gas choices are.