Center of Excellence OTW Final Exam

1.

1 point

Which of the following indicates you are ready to start your weld. Select all that apply.

You can see some light between your joint.

Joint is not offset or misaligned.

You have purged for at least 7 minutes and oxygen sensor reads 0.

Achieving magnehelic pressure matching which was set on straight tubing or assembly.

2.

1 point

How should you use Scotch-Brite?

Scrub circumferentially

Scrub along the length

After cleaning with acetone and only on titanium

Scrub only on the regions not affected by heat

3.

1 point

Tungsten electrodes are 2% ___________.

Carbide

Ceriated

Lanthanated

Thoriated

4.

1 point

To maintain electrode geometry, brushing motions should be across the circumference of the electrode, and not along the length.

True

False

5.

1 point

Arc wander shall not exceed more than ___ of the nominal bead width taken at the widest portion of the weld.

5%

25%

15%

10%

6.

1 point

Offset or misalignment inspection criteria states joint mismatch can be up to 10% of __________?

Tubing diameter

Nominal wall thickness

None of the above

Depends on the material

7.

1 point

Which defines a Class A Joint?

A weld joint whose failure would result in loss of life, loss of vehicle, or mission failure

A weld joint which passes QA visual inspection

A fail-safe weld joint, often protected via redundancy of the structure, and failure of the weld will not result in failure of the vehicle or mission

A weld joint comprised of two different material types

8.

1 point

Which of the following is not a form of written work instructions?

Step Work Instructions on Work Orders

Issue in "Work in Progress" status

Notes in the top left of approved and released engineering drawings

Verbal description via your process engineer

9.

1 point

When would you use AK-225G as a cleaning solvent?

On systems using hypergolic propellant

On systems using LOX

On systems using RP-1

On systems using helium

10.

1 point

Cross contamination is not important if the weld is not going through x-ray (Class A).

True

False

11.

1 point

A weld ________ must be selected from the list provided on the power supply and cannot be altered without approval from your lead or upper management.

12.

1 point

Matching the pressure set on a straight tube or assembly when fitting up a joint is the only way to determine a joint is fit up correctly.

True

False

13.

1 point

What do parentheses mean if they surround a measurement on an engineering drawing?

You must abide by the measurement with 10% tolerance

A second party verification is required

You must strictly abide by the measurement with 0 tolerance

Reference only

14.

1 point

A repeatability coupon shall be produced under the following conditions. Select all that apply.

Any adjustment to the power supply

Any adjustment to the weld schedule beyond allowable deviations

Change in material, diameter, or wall thickness

Any indication of a defective weld

15.

1 point

You are allowed _ total heat inputs before an issue ticket must be created.

4

3

5

2

16.

1 point

What is the acceptable discoloration for titanium?

Straw

Violet

Blue

All color is acceptable

17.

1 point

FOD stands for

Failure of drawing

Foreign object debris/damage

Face or deburr

Foreign object discrepancy

18.

1 point

Searches in Teamcenter are mainly done using

Work orders

Drawing revision

Tubing dimensions

Part numbers

19.

1 point

Weld downslope will be sufficient to create weld ______ that ties into the weld without creating a difference in weld width and ensuring complete penetration throughout the entire weld.

width

overlap

penetration

separation

20.

1 point

You must immediately report any personal injury or property damage to the appropriate manager, regardless of how insignificant the mishap may appear.

True

False

21.

1 point

Drawings must be in the _______ status to use on flight

released

pending

confirmed

rejected

22.

1 point

What is the process an issue ticket goes through?

Verification, pending closure, closed, pending approval of disposition, disposition, work in progress

Pending approval of disposition, disposition, verification, work in progress, pending closure, closed

Disposition, Pending approval of disposition, work in progress, verification, pending closure, closed

Work in progress, verification, disposition, pending approval of disposition, pending closing, closed

23.

1 point

Welders will not be permitted to weld on production hardware without a SpaceX welder certification on file.

True

False

24.

1 point

Please select the best definition of a tack weld from the options below.

An automated weld using filler material.

An automated weld sized smaller than the final weld bead with full penetration.

A manually made weld with the use of filler material over an orbital weld.

A manually made weld without the use of filler material which is typically sized smaller than the final weld bead and partially penetrated.

25.

1 point

Which power supply must be set to calibrate to prevent sleep mode when stepping away for extended periods of time?

AMI 207

EXEL 1500

EXEL 2000

AMI 307

26.

1 point

Where can engineering drawings be found? Select all that apply.

via the hyperlink at the top of a work order

ShareX

SpaceX library

in the attachments section in Teamcenter

27.

1 point

Angle dimension tolerance for X is _____

+/- 15°

+/- 5°

+/- 1°

+/- 10% of given degree

28.

1 point

Purge times can vary based on ______. Select all that apply.

Length of tube assembly

Diameter of tube assembly

Relative complexity of tube assembly

Power supply and weld head

29.

1 point

Which defines a Class B Joint?

A weld joint requiring QA visual inspection, x-ray and dye-pen

A fail-safe weld, often protected via redundancy of the structure, and failure of the weld will not result in failure of the vehicle or mission

A weld joint consisting of at least one tee

A weld joint whose failure would result in loss of life, loss of vehicle, or mission failure

30.

1 point

After facing, you must visually verify the tube face is completely square and free of burrs.

True

False

31.

1 point

What is ID and OD?

Infected Deposit, Orthogonal Deposit

Incorrect Dimension, Odd Dimension

Inner Diameter, Outer Diameter

Incomplete Direction, Obtuse Direction

32.

1 point

Though the arc is contained inside an enclosed weld head during OTW, caution should still be used to avoid directly looking at or being exposed to the welding arc.

True

False

33.

1 point

Weld beads are preferred to remain flush with the surface of the parent tubing. Deviation in concavity/convexity will not exceed more than ___ of the nominal wall thickness of the tube.

20%

15%

5%

30%

34.

1 point

Tungsten selection is determined by? Select all that apply

Power supply

Tubing wall thickness

Tubing diameter

Weld head

35.

1 point

Oxidation and discoloration is acceptable on stainless steel and Inconel except where the oxide layer is deemed excessive.

True

False

36.

1 point

You must clean your weld head and tungsten after every weld.

True

False

37.

1 point

Which tool do you use to measure bead width to determine length of scribes?

Facer

Feeler guage

Calipers

4x eye loupe

38.

1 point

Which toolbar allows you to measure tubing length in Teamcenter?

3D Measurement

3D Standard Views

3D Comparison

3D Selection

39.

1 point

To prevent the introduction of FOD, you must always keep tubes capped or plugged.

True

False

40.

1 point

_____ is the inert shielding gas used in the ID and around the OD of tubing during OTW.

41.

1 point

Carbon scoring and build up does not create a secondary arc path, which can result in a defective weld or damage the weld head itself.

True

False

42.

1 point

Argon is heavier than air, so the ideal purge will have the inlet located _____ the outlet, allowing the argon to displace the oxygen easier.

below

none of the above

adjacent to

above

43.

1 point

You can buy off foam plug removal on work orders without physically seeing the removal if you trust your co-worker.

True

False

44.

1 point

The operator shall be responsible for carrying out the production welds in accordance with the weld procedure specification (WPS), and assuring that all required process data is logged accurately.

True

False

45.

1 point

Engineering drawings with dimensions .XXX have a tolerance of ____.

+/- 0.1

+/- 10% wall thickness

+/- 0.010

+/- 0.02

46.

1 point

Which of the following are allowable solvents to be used to clean flight hardware. Select all that apply.

Isopropyl Alcohol

Ethanol

Acetone

AK-225G

47.

1 point

Scribes must

be consumed by the weld bead

not be deep enough you can catch with your fingernail

be accompanied by TEC markings

all of the above

48.

1 point

What is the OTW specification?

SPX-00005453

SPX-00006876

SPX-00001465

SPX-00005351

49.

1 point

Which is the correct order for submitting a coupon to QA?

Prepare one tube, weld bead over tube, print schedule, sign in to QA logbook, determine material and dimensions

Determine material and dimensions, prepare two tubes, weld tube to tube, print schedule, sign in to QA logbook

Prepare two tubes, weld tube to tube, determine material and dimensions

Determine material and dimensions, print schedule, sign in to QA logbook

50.

1 point

To prevent cross contamination, you should always close solvent containers and never double-dip cotton swabs or lint free cloths.

True

False