Self Tests Flashcards
Which organizations have written specifications for GMAW filler metals?
AWS and CSA
The composition of the base metal is the major factor to consider when selecting:
Filler materials
Silicon, aluminum and manganese, when added to ER49S-2 are used as:
Deoxidizers
When using GMAW on mild steel with carbon dioxide shielding, which type of filler wire should be selected?
A deoxidized wire
When wires are packaged in sealed containers, it is mainly to protect them from:
Moisture contamination
Improperly stored wires most often produce welds with:
Porosity
Filler metals containing additional deoxidizers are intended for use on:
Moderately rusty low-carbon steels
What does the G stand for in the CSA GMAW electrode classification ER49S-G?
General classification for new electrodes not covered under any other classifications
When oxygen and nitrogen from the atmosphere become mixed in the molten weld metal, they:
Form harmful oxides and intrudes in the weld metal
Which gas is the lightest?
Hydrogen
Argon and helium are:
Inert gases
Where would you use pure argon shielding has with GMAW
Welding of non-ferrous materials such as aluminum, magnesium and their alloys
What is carbon dioxide gas primarily used for
Welding of carbon steels
Is carbon dioxide a monatomic gas or a compound gas
Compound
A characteristic of carbon dioxide shielding gas used with short-circuiting metal transfer is
High weld metal loss in the form of spatter
