API 577 | QUESTIONS AND ANSWERS | 2026 UPDATE |
WITH COMPLETE SOLUTION
How many welds does API 577 require to be radiographed? Answer - Zero.
(The number of welds to RT is established by the primary code)
Arc Blow Answer - The deflection of an arc from its normal path because of
magnetic forces
Arc Length Answer - The distance from the top of the welding electrode to the
adjacent surface of the weld pool
Autogenous Weld (one without filler metal) Answer - A fusion made without
filler metal
Backing Answer - 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 Answer - 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 Answer - 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 Answer - Entrapped foreign solid material, such as slag, flux,
tungsten, or oxide
Undercut Answer - 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 Answer - Action is based on nature of
non-conformance
Which welding process is most widely used Answer - SMAW
Describe the SMAW process Answer - 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 Answer - 1. shielding gas
2. prevent excessive grain growth
3. slag blanket to protect weld
4. sometimes provide alloy elements
Advantages of SMAW Answer - 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 Answer - 1. Lower deposition rates
2. Slag must be removed from deposited weld passes
WITH COMPLETE SOLUTION
How many welds does API 577 require to be radiographed? Answer - Zero.
(The number of welds to RT is established by the primary code)
Arc Blow Answer - The deflection of an arc from its normal path because of
magnetic forces
Arc Length Answer - The distance from the top of the welding electrode to the
adjacent surface of the weld pool
Autogenous Weld (one without filler metal) Answer - A fusion made without
filler metal
Backing Answer - 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 Answer - 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 Answer - 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 Answer - Entrapped foreign solid material, such as slag, flux,
tungsten, or oxide
Undercut Answer - 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 Answer - Action is based on nature of
non-conformance
Which welding process is most widely used Answer - SMAW
Describe the SMAW process Answer - 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 Answer - 1. shielding gas
2. prevent excessive grain growth
3. slag blanket to protect weld
4. sometimes provide alloy elements
Advantages of SMAW Answer - 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 Answer - 1. Lower deposition rates
2. Slag must be removed from deposited weld passes
