API 577 Exam Questions And Answers Graded A+
How many welds does API 577 require to be radiographed?
Zero. (The number of welds to RT is established by the primary code)
Arc Blow
The deflection of an arc from its normal path because of magnetic forces
Arc Length
The distance from the ...
API 577 Exam Questions And Answers Graded
A+
How many welds does API 577 require to be radiographed?
Zero. (The number of welds to RT is established by the primary code)
Arc Blow
The deflection of an arc from its normal path because of magnetic forces
Arc Length
The distance from the top of the welding electrode to the adjacent surface of the weld pool
Autogenous Weld (one without filler metal)
A fusion made without filler metal
Backing
A material or device placed against the backside of the joint, or at both sides of a weld in welding, to
support and retain molten weld metal
Defect
A discontinuity or discontinuities that by nature or accumulated effect render a part or product
unable to meet minimum applicable acceptance standards or specifications. The term designated
reject ability
Discontinuity
An interruption of the typical structure of a material, such as a lack of homogeneity in its mechanical,
metallurgical, or physical characteristics. A discontinuity is not necessarily a defect
Inclusion
Entrapped foreign solid material, such as slag, flux, tungsten, or oxide
Undercut
A groove melted into the base metal adjacent to the weld toe or weld root and left I filled by weld
metal
Corrective action of non-conformance
Action is based on nature of non-conformance
Which welding process is most widely used
SMAW
Describe the SMAW process
Arc between covered electrode and weld pool. Heat of arc comes from tip of a consumable covered
electrode. Shielding comes from decomposition of the electrode coating
, Basic functions of the SMAW electrode coating
1. shielding gas
2. prevent excessive grain growth
3. slag blanket to protect weld
4. sometimes provide alloy elements
Advantages of SMAW
1. Simple inexpensive and portable
2. Process can be used in areas of limited access
3. Less sensitive to wind and draft
4. Suitable for most common metals and alloys
Limitations of SMAW
1. Lower deposition rates
2. Slag must be removed from deposited weld passes
Advantages of GTAW
1. Produces high quality welds
2. Little postweld cleaning
3. Excellent control of root pass
4. With or without filler metal
Limitations of GTAW
1. Lower deposition rates
2. Has a low tolerance for contamination on filler or base metals
3. Difficult to shield weld zone properly if drafty
Advantages of GMAW
1. Only consumable electrode process that can be used to weld commercial metals or alloys
2. Deposition rates are higher
3. Minimal postweld cleaning is required
Limitations of GMAW
1. More complex costly and less portable
2. Welding arc needs to be protected from drafts
3. GMAW-S the weld is more susceptible to lack of adequate fusion
Advantages of FCAW
1. Metallurgical benefits from flux
2. Slag that supports and shapes weld
3. Higher deposition
4. Shielding produces at surface of weld
Limitations of FCAW
1. Not recommended for pressure containing welds
2. More complex costly and less portable
3. Generates large volume of welding fumes
4. Slay should be removed between passes
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