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GTAW Topic 24

Ms. Rose

Name:_____________________________
Across
Cathodic bombardment occurs during the ___ portion of the AC cycle
Aluminum has excellent ___ resistance
Caution: Aluminum does ___ change color when it is hot
You weld aluminum with ___ current
Will form a protective ___ coating as soon as exposed to oxygen
Filler metals for aluminum are based on ___ conditions of the weldment rather than tensile strength as done with carbon
HT aluminum alloys acquire their strength from ___ treatment
Alloys, heat- treating and cold working can all increase the ___ strength
Down
The higher thermal expansion can result in ___
Allways use the ___ technique on aluminum
Aluminum should be brushed using a stainless-steel wire brush just ___ to welding
Moisture from oxide can cause ___ in the weld
The oxide coating will prevent the molten aluminum from ___ to form a sound weld
Aluminum oxide is ___ and can retain moisture
NHT aluminum alloys acquire their strength from ___ hardening
The higher conductivity of heat will require a higher ___ setting
Chemical ___ cleaning is sometimes necessary