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API 577 Welding Inspection and Metallurgy Exam Guide & Preparation

API 577 Welding Inspection and Metallurgy certifies your competency in welding processes, welder and procedure qualification, metallurgical effects of welding, and inspection techniques used across static equipment fabrication and repair, based on API RP 577 and ASME Section IX (Part QW).

Reviewed by Senior Metallurgical Inspection Engineer, 45 years · Updated 16 Oct 2026

1,547
Questions
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Modules
54
Mock tests
379
Flashcards
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Study notes
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EXAM ANATOMY: 110 (100 scored, 10 unscored pretest) ACROSS 5 BOK DOMAINS
API 577, 2026 Edition
Welding Processes & Procedures 15%
Welder & Procedure Qualification (ASME IX) 25%
Metallurgical Effects of Welding 25%
Weld Defects & Acceptance Criteria 20%
Inspection Techniques & NDT Awareness 15%
OverviewCompareEligibilityBOK BreakdownRegistrationSample QuestionsMaterialsRelated ExamsFAQs
Overview & Scope

API 577 Welding Inspection and Metallurgy certifies your competency in welding processes, welder and procedure qualification, metallurgical effects of welding, and inspection techniques used across static equipment fabrication and repair, based on API RP 577 and ASME Section IX (Part QW).

Unlike API 510, 570, and 653, which test equipment-specific inspection codes, API 577 is discipline-focused: it validates welding and metallurgy knowledge that supports an inspector implementing those equipment-specific codes, rather than certifying inspection authority over a particular asset type on its own.

The exam runs 110 questions across 3.25 hours, closed-book, with only 100 of the 110 questions scored, the remaining 10 are unscored pretest items. No paper or reference materials are permitted, so unlike API 510, 570, and 653's open-book portion, API 577 tests recall and applied judgment without any lookup support.

Whether you're looking for a structured API 577 course, self-paced API 577 online training, or simply a focused way to study for API 577 certification around a working schedule, EIM's API 577 training platform is built to fit all three.

Exam Code
API-577
Total Questions
110 (100 scored, 10 unscored pretest)
Duration
3.25 hours
Format
Closed-book, multiple-choice, no reference material permitted
Reference Standards
API RP 577, 3rd Edition; ASME Section IX (Part QW)
Certification Validity
3 years
Auto-Qualifies
Current API 510, 570, or 653 holders
Testing Venue
Prometric testing centers, worldwide
Comparison

API 577 vs API 510, 570, and 653

API 510, 570, and 653 each certify inspection authority for a specific equipment category: pressure vessels, piping, and storage tanks respectively. API 577 doesn't certify authority over an equipment type at all, it certifies the underlying welding and metallurgy competency that supports inspection decisions across all three, which is why API 577's own reference practice explicitly describes itself as assisting inspectors implementing API 510, 570, 653, and 582.

This relationship is reflected directly in eligibility: holding a current API 510, 570, or 653 certification automatically qualifies you to sit for API 577, the same auto-qualify pattern API uses for API 571. Many inspectors pursue 577 alongside or shortly after their first equipment-specific certification, since weld integrity is a common thread across pressure vessel, piping, and tank inspection work.

Eligibility

Qualification & Prerequisites

Direct Qualification
Holding a current API 510, 570, or 653 certification automatically qualifies you to sit for the API 577 examination, no additional documentation required beyond your active certification status.
Combination Route
Without a primary API certification, eligibility is based on a combination of education and industry experience acquired within the last 10 years: typically a relevant bachelor's degree plus 1 year of experience, a 2-year technical degree plus 2 years of experience, or a high school diploma plus 3 years of experience. Exact thresholds are published in API 577's eligibility table and should be verified against the current edition before applying.
BODY OF KNOWLEDGE

What the Exam Actually Tests

Five domains, weighted by question share. This is the map the question bank is built directly against.

01Welding Processes & Procedures

SMAW, GTAW, GMAW, SAW process fundamentals, welding procedure specifications (WPS)

02Welder & Procedure Qualification (ASME IX)

WPS qualification, welder performance qualification (WPQ), essential variables

03Metallurgical Effects of Welding

Heat-affected zone (HAZ) changes, hydrogen cracking, lamellar tearing, post-weld heat treatment

04Weld Defects & Acceptance Criteria

Porosity, slag inclusions, incomplete fusion, undercut, code-based acceptance limits

05Inspection Techniques & NDT Awareness

Visual inspection technique, NDT method selection (RT, UT, MT, PT) as it applies to weld inspection sign-off

01. Welding Processes & Procedures

Covers the common fusion welding processes used in static equipment fabrication and repair, and how a welding procedure specification translates process parameters into a documented, repeatable method. An inspector doesn't need to weld, but does need to recognize whether the process and parameters used on a given joint match what the WPS actually calls for, since a mismatch is itself a quality issue independent of the finished weld's appearance.

02. Welder & Procedure Qualification (ASME IX)

Tests your understanding of ASME Section IX Part QW: how a welding procedure gets qualified through test coupons and mechanical testing, how individual welders get qualified to perform that procedure, and which variables are essential (a change requires requalification) versus nonessential. This is one of the areas where candidates who've only worked from experience, without studying the formal qualification logic, most often lose points.

03. Metallurgical Effects of Welding

Covers how the welding process itself changes base metal properties in the heat-affected zone, and the metallurgical failure modes that can result: hydrogen-induced cracking in susceptible steels, lamellar tearing in restrained joints on plate with poor through-thickness ductility, and how post-weld heat treatment is used to relieve residual stress and temper hard microstructures. This domain connects welding practice directly to the damage-mechanism thinking API 571 covers in more depth.

04. Weld Defects & Acceptance Criteria

Covers recognizing common weld defects and applying the acceptance criteria from the governing construction or repair code, since a defect's presence alone doesn't automatically mean rejection, its size and location relative to the code's limits determine disposition. Distinguishing a cosmetic, acceptable discontinuity from a rejectable defect is a repeated exam pattern.

05. Inspection Techniques & NDT Awareness

Covers visual inspection technique in depth, since it's the inspection method every welding inspector personally performs, along with working awareness of when radiographic, ultrasonic, magnetic particle, or liquid penetrant testing is the appropriate NDT method for a given weld and defect type. The exam expects you to know which method fits a scenario, not to interpret NDT results at a Level II technician's depth.
Registration

How to Register and What to Expect on Exam Day

Candidates apply directly through API's Individual Certification Programs (ICP) portal, not through EIM or any third-party training provider. Exams are administered at Prometric testing centers worldwide during specified testing windows throughout the year.

Recertification applications can be submitted up to 90 days before your certification's expiration date, with a further 90-day grace period after expiration before the certification lapses entirely. At this time, API does not require employment verification for API 577 recertification, unlike the initial application, which does require documented eligibility.

Who built this

Senior Metallurgical Inspection Engineer, 45 years

This material was reviewed by a senior metallurgical inspection engineer with 45 years in non-destructive testing, materials testing and quality assurance.

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Sample Practice Questions

03: Metallurgical Effects of Welding

A thick-plate restrained joint on a low-sulfur steel plate develops a subsurface, step-like crack running parallel to the plate surface shortly after welding, without any surface-breaking indication. Which mechanism is most likely responsible?

A. Hydrogen-induced cracking
B. Lamellar tearing
C. Solidification cracking
D. Reheat cracking
Explanation: Lamellar tearing produces subsurface, terrace-like stepped cracking running parallel to the plate surface, driven by through-thickness stress acting on planar non-metallic inclusions in the base metal. It's most associated with highly restrained joints on thick plate, and is a metallurgical base-metal issue rather than a weld-metal defect, which is why it can appear even when the weld itself was made correctly.
02: Welder & Procedure Qualification (ASME IX)

A welder qualified on a procedure using a specific filler metal classification changes to a different filler metal classification for a production weld. Under ASME Section IX, what is required before this change is permitted?

A. Nothing, filler metal classification is a nonessential variable
B. The change must be requalified since filler metal classification is an essential variable
C. Only a supervisor's written approval is needed
D. The change is automatically covered under the original WPQ
Explanation: Filler metal classification is treated as an essential variable under ASME Section IX for most welding processes, meaning a change outside the qualified range requires the procedure to be requalified before production use. Confusing essential with nonessential variables is one of the most common mistakes candidates make on this domain.
Module 1 · API 577 Certification, BOK & Welding Inspection Framework

Finding: UT calibration check fails mid-shift. What is the correct inspector action?

A. Re-examine all welds since last good check
B. Trace welder; correct records
C. PMI/verify; quarantine
D. Repeat after the specified hold time
Explanation: Consistent with RP 577 §9 and the program's inspection lifecycle. Why not the others: The other actions address different findings. Common trap: Accepting work to keep the schedule. Reference: RP 577 §9, Annexes B and F
Module 4 · Shielded Metal Arc Welding (SMAW)

Which electrode is classified for flat and horizontal fillet positions only?

A. E7018
B. E6010
C. E7016
D. E7024
Explanation: Position digit 2. Why not the others: The others are all-position. Common trap: Confusing closely related smaw designation facts. Reference: RP 577 §5, Annex D; QW-420 – QW-442
Module 7 · Submerged Arc Welding & Other API RP 577 Processes

Which process uses a ceramic ferrule and plunges the stud into the molten pool?

A. PAW
B. Stud arc welding
C. EGW
D. FCAW-S
Explanation: Stud arc welding draws an arc, then plunges the stud; the ferrule shields and shapes the weld.
Module 11 · Weld Metal Solidification & the Heat-Affected Zone

Why do high-alloy materials welded with gas-shielded processes usually use inert gas or only slight reactive additions?

A. To increase deposition
B. To raise weld carbon for strength
C. Reactive gases such as CO₂ can raise carbon and form oxides that lower corrosion resistance
D. Because argon is cheaper
Explanation: RP 577 explains CO₂ can break down, adding carbon and oxides to high-alloy welds.
Module 14 · Stainless Steels, High-Alloy Materials & Dissimilar Welding

Situation: Nitrogen purge used on stainless root. What is the main concern?

A. Low conductivity, high expansion
B. Decrease > 55 °C — essential
C. Permitted per RP 577; reduces ferrite
D. Martensite from dilution
Explanation: As taught in Modules 13 – 14. Why not the others: The other concerns belong to different situations. Common trap: Applying carbon-steel thinking to alloys. Reference: RP 577 §10
Module 17 · Welder & Welding Operator Qualification

Which combination of pipe tests qualifies all groove positions?

A. 2G plus 5G
B. 1G plus 2G
C. 1G plus 5G
D. 2G plus 1G
Explanation: QW-461.9. Why not the others: The other options do not match the API RP 577 / ASME IX rule for this item. Common trap: Confusing closely related positions rules. Reference: RP 577 §7, Annex B; ASME IX QW-300 – QW-461
Resources

What's Included in the Self-Prep Package

Q
API 577 Question Bank

Scenario-based questions mapped to the current API 577 Body of Knowledge, with a worked explanation for every answer.

S
API 577 Study Notes

Downloadable study material covering welding processes, ASME IX qualification, metallurgy, and inspection techniques.

M
API 577 Mock Test

Full-length practice exam mirroring the real 110-question, 3.25-hour closed-book format.

FAQs

Common Questions

What is the API 577 certification?
API 577 certifies competency in welding processes, welder and procedure qualification, metallurgical effects of welding, and inspection techniques, based on API RP 577 and ASME Section IX. It supports inspectors implementing API 510, 570, 653, and 582 rather than certifying authority over a specific equipment type on its own.
How many questions are on the API 577 exam?
110 total questions, of which only 100 are scored, the remaining 10 are unscored pretest items mixed in without being identified to the candidate. The exam runs 3.25 hours and is entirely closed-book.
Is the API 577 exam open-book?
No, unlike API 510, 570, and 653, which include an open-book portion, API 577 is completely closed-book with no paper or reference materials permitted, so preparation should emphasize recall and applied understanding rather than reference navigation.
Am I automatically eligible for API 577 if I hold API 510?
Yes, holding a current API 510, 570, or 653 certification automatically qualifies you to sit for API 577, the same auto-qualify pattern used for API 571. Without one of those certifications, eligibility is based on a combination of education and documented industry experience.
How much does API 577 certification cost?
Check API's current ICP fee schedule for the official exam fee, which is separate from EIM's API 577 course, question bank, and study material pricing.
How long is API 577 certification valid?
3 years from issuance. Recertification applications can be submitted up to 90 days before expiration, with a further 90-day grace period after expiration before the certification lapses and a full re-examination is required.
What does EIM's API 577 training include?
A structured API 577 question bank covering welding processes, ASME IX qualification logic, metallurgy, and inspection techniques, downloadable study notes, and a full-length mock test mirroring the real exam's closed-book, timed format, all available as self-paced online training.
Is API 577 recognized as an inspector certification internationally?
Yes, API 577 is recognized globally across refining and petrochemical operations and is commonly pursued alongside API 510, 570, or 653 to strengthen welding and metallurgy competency relevant to equipment inspection.
In Depth

Why API 577 Welding Inspection and Metallurgy Matters for Asset Integrity Careers

A pattern worth understanding before you study: API 577's own reference document, API RP 577, doesn't mandate inspecting every weld or specify exact inspection extent, it's written as guidance an authorized inspector applies with judgment, not a rigid checklist. The exam reflects that same philosophy, questions are built to test whether you understand why a welding or metallurgical issue matters for equipment integrity, not just whether you can recite a definition.

Because the exam is entirely closed-book with no reference material allowed, unlike API 510, 570, and 653's open-book portion, effective API 577 exam preparation leans more heavily on repetition and recall than on reference-navigation practice. EIM's API 577 question bank is built around this reality: every practice question is scenario-based and paired with a worked explanation, so an incorrect answer becomes a diagnostic tool for exactly which welding or metallurgy concept needs another pass.

Start preparing

API 577 Welding Inspection and Metallurgy

1 Year access, on any device.

Inside the bank
  • API 577 Certification, BOK & Welding Inspection Framework100 Q
  • Welding Terminology, Joints & Weld Geometry50 Q
  • Arc Welding Fundamentals & Electrical Characteristics54 Q
  • Shielded Metal Arc Welding (SMAW)29 Q
  • Gas Tungsten Arc Welding (GTAW)21 Q
  • GMAW, FCAW & Metal Transfer34 Q

Plus 450 questions in full-length timed mock papers, for 1,547 in all.

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