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
Which mode of metal transfer are possible with GMAW using 0.9mm(0.035”) mild steel wire an carbon dioxide shielding gas
Globular and short circuiting
The addition of oxygen to argon causes the temperature of the molten metal to
Increase
Compared to CO2 argon is an excellent shielding gas for GMAW because it allows the use of
Spray metal transfer
Which of the following gas mixes tends to produce low-crowned weld beads on stainless steels
Argon-helium-carbon dioxide
