Piping Pipe Welding and Fabrication 3

Question 1

What does 'weld map' refer to in pipe fabrication?

Accepted Answer

A drawing showing the location of all welds on a pipe spool with unique weld identification numbers

Answer

A map showing welding shop locations

Answer

A chart of acceptable weld defect sizes

Answer

A layout of welding machine positions in the shop

Question 2

Which type of weld discontinuity is typically caused by incorrect travel speed or arc length during pipe welding?

Accepted Answer

Undercut

Answer

Porosity

Answer

Slag inclusion

Answer

Lack of root penetration

Question 3

What is the significance of a welder's 'coupon test' in qualifying to ASME Section IX?

Accepted Answer

It produces a test weld that is mechanically tested to verify the welder can produce sound welds within specified essential variables

Answer

It tests the welder's speed and productivity

Answer

It evaluates the welder's knowledge of welding symbols

Answer

It certifies the welder for all materials and positions

Question 4

In pipe fabrication, what does 'fit-up' mean?

Accepted Answer

The alignment and positioning of pipe components before welding

Answer

The final painting and coating of the pipe spool

Answer

The installation of pipe supports

Answer

The pressure testing of completed spools

Question 5

What is 'hi-lo' in pipe welding terminology?

Accepted Answer

The mismatch in inner diameter alignment between two pipe ends being joined

Answer

A technique for high-low position welding

Answer

The difference between preheat and interpass temperature

Answer

A two-pass weld technique using high then low current

Question 6

What is the purpose of a hydrostatic test on a fabricated pipe spool before installation?

Accepted Answer

To verify structural integrity and leak-tightness under pressure exceeding the design pressure

Answer

To check internal coating adhesion

Answer

To flush out fabrication debris

Answer

To calibrate the pressure gauges