Which of the following types of tungsten electrodes is a possible replacement for 2% Thoriated?

is an aluminum alloyed with magnesium and is great for a variety of applications, but is not suitable for applications where the service temperature exceeds 150°F (65°C).

For thin gage steel and stainless steel, follow the rule of thumb to never use a filler rod that is:

Excessive shielding gas can cause ___________ to infiltrate the weld zone.

is added to aluminum filler rod to reduce the melting point and improve puddle fluidity.

When welding aluminum, you should use the ____________ filler rod you can control.

The correct arc length for GTAW is:

Which of the following is NOT an important variable in achieving a good bead?

The operator may employ a pattern to increase heat in base metal, to bridge a gap or to increase penetration on a vertical up weld.

is a weld defect where the weld toe overlaps the base metal.