Piping and Welding

Even when other welding processes are primarily used for a pipe weld, GTAW is often used to make the _____.

• cover pass

• tack welds

• root pass

• weave beads

Oxygen sources must be kept away from _____.

• anti-spatter sprays

• filler rods

• hexavalent chromium

• petroleum products

According to typical ASME, API, and AWS pipe bevel specifications, the root face should be no more than

_____.

• 1/16" (1.6 mm)

• 1/8" (3 mm)

• 1/4" (6 mm)

• 1/2" (13 mm)

The generally preferred power type and polarity for GTAW is _____.

• DCEN

• DCEP

• AC

• ACEP

For welding in the 1G-ROTATED, 2G, and 5G positions, the pipe axis can vary from the basic position by as much as _____.

• 5 degrees

• 10 degrees

• 15 degrees

• 20 degrees

Carbon steel pipe welds made with GTAW normally require a 15- to 20-degree _____.

• push angle

• drag angle

• work angle

• bevel angle

A technique used to prevent contamination of the electrode when feeding the filler rod into the weld puddle is to _____.

• change from a push angle to a slight drag angle

• change the work angle about 10 degrees temporarily

• move the torch toward the back edge of the puddle

• move the torch toward the leading edge of the puddle

When using GTAW on carbon steel pipe in the 1G-ROTATED position, run all passes at or near a point _____.

• at the top of the pipe as it rotates

• at the bottom of the pipe as it rotates

• that is 45 degrees from the top of the pipe

• that is 90 degrees from the bottom of the pipe

When using GTAW for open-root V-groove welds on carbon steel pipe in the 2G position, what can you do to prevent the weld puddle from sagging?

• Increase the travel speed.

• Increase the welding current.

• Raise the torch work angle slightly, but not more than 10 degrees.

• Drop the torch work angle slightly, but not more than 10 degrees.

When using GTAW for open-root V-groove welds on carbon steel pipe in the 5G position, start at a tack weld positioned at the _____.

• top of the pipe and weld downhill

• bottom of the pipe and weld uphill

• right side of the pipe and weld downhill

• left side of the pipe and weld downhill