Worksheetsua chapter 18
Total questions: 14
Worksheet time: 7mins
The electrode positive part of the AC cycle produces a cleaning action that removes the oxide coating on aluminum.
true
false
Stainless steels, especially those in the 300 austenitic series, are commonly welded with GTAW using DCEP.
true
false
High-carbon steels are weldable but require preheat and postheating.
true
false
Filler metals for welding stainless steels are alloyed to prevent cracking problems.
true
false
When welding, the fumes from copper and copper alloys can be toxic.
true
false
Wrought aluminum alloys in the ___ series are readily weldable.
2000
3000
6000
7000
A forehand welding technique usually produces the best results when welding copper and copper alloys.
true
false
The procedure for welding all types of stainless steels with GTAW is the same.
true
false
The welding characteristics of magnesium are comparable to those of carbon steel.
true
false
When welding aluminum with GTAW, the best results are obtained by using ___ shielding gas.
75% argon 25% CO2
98% Argon @% CO2
100% helium
100% argon
Acetone is commonly used for cleaning contaminants on aluminum.
true
false
When welding thin-gauge aluminum, ___ should be used to minimize distortion.
filler metal
stainless steel backing bars
copper backing bars
postheating
Filler metal for GTAW is the same as the filler metal used for SMAW.
true
false
A nonferrous metal is a metal that does not contain ___.
copper
aluminum
magnesium
iron
