AIT Exam – Administrator in Training Long-Term Care Administration Certification
Review
Shielding gas - ✔✔Protects the molten weld material and surrounding area from
contamination by atmospheric air
Primary purpose is to prevent the molten weld metal from absorbing elements from
atmospheric air such as oxygen and nitrogen
Types of shielding gases - ✔✔-Arc Plasma
-Compressed Gas
-Cryogenic Liquid
-Dewar
-Liquefied Compressed Gas
The atmosphere is made up of approx 21% of ____ and 78% ___ - ✔✔21% oxygen
78% nitrogen
Shielding gas has a significant effect on: - ✔✔-Arc characteristics
-Mode of metal transfer
-Penetration
-Weld metal profile
-Tendency to undercut
-Cleaning action
-Speed of weld
-Mechanical and chemical properties of the weld metal
Review
Shielding gas - ✔✔Protects the molten weld material and surrounding area from
contamination by atmospheric air
Primary purpose is to prevent the molten weld metal from absorbing elements from
atmospheric air such as oxygen and nitrogen
Types of shielding gases - ✔✔-Arc Plasma
-Compressed Gas
-Cryogenic Liquid
-Dewar
-Liquefied Compressed Gas
The atmosphere is made up of approx 21% of ____ and 78% ___ - ✔✔21% oxygen
78% nitrogen
Shielding gas has a significant effect on: - ✔✔-Arc characteristics
-Mode of metal transfer
-Penetration
-Weld metal profile
-Tendency to undercut
-Cleaning action
-Speed of weld
-Mechanical and chemical properties of the weld metal