Syllabi change, and so do exams — API Welding Inspection And Metallurgy is no exception. Lead2Passed refreshes its API-577 practice questions throughout 2026, and 365 days of free updates keep all 112 questions aligned with the current exam.
API API-577 Exam Overview:
| Certification Vendor: | American Petroleum Institute (API) |
|---|---|
| Exam Name: | Welding Inspection and Metallurgy Exam |
| Exam Number: | API-577 |
| Real Exam Qty: | 110 (100 scored, 10 pre-test) |
| Related Certifications: | API 570 Piping Inspector API 510 Pressure Vessel Inspector API 653 Aboveground Storage Tank Inspector |
| Passing Score: | Scaled score, approximately 70% |
| Exam Format: | Multiple-choice questions, Closed-book exam |
| Exam Price: | $440 USD |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Exam Duration: | 195 minutes |
| Recommended Training: | API Recommended Training Resources |
| Exam Registration: | API Official Registration |
| Sample Questions: | DOWNLOAD DEMO |
| Exam Way: | Online remote proctored or in-person at Prometric test centers |
| Pre Condition: | Hold current API 510, 570 or 653 certification; or BS/BE + 1 year experience; or 2-year degree + 2 years experience; or high school + 3 years experience (all within last 10 years) |
| Official Syllabus URL: | https://www.api.org/products-and-services/individual-certification-programs/certifications/api577 |
API API-577 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Welding Processes | 20% | - Common welding processes (SMAW, GTAW, GMAW, FCAW, SAW, etc.) - Welding parameters and their effects - Process principles, equipment, applications and limitations |
| Welding Materials and Consumables | 15% | - Filler metal classification and selection - Consumable storage, handling and control - P-number and F-number assignments |
| Welding Metallurgy | 20% | - Phase transformations and cooling rates - Heat-affected zone (HAZ) and microstructure changes - Material properties and classifications - Weld defects and metallurgical causes |
| Industry Applications and Standards | 10% | - Refining and petrochemical plant welding requirements - API RP 577 and related codes/standards - Safety and quality control in welding operations |
| Welding Procedures and Qualifications | 20% | - Welding Procedure Specification (WPS) - Essential and non-essential variables - Procedure Qualification Record (PQR) - Welder performance qualification |
| Welding Inspection Techniques | 15% | - Non-destructive examination (NDE) methods related to welding - Defect evaluation and acceptance standards - Inspection planning and documentation - Visual inspection methods and criteria |
Common Questions About the API API-577 Exam, Answered
The API-577 exam, officially titled Welding Inspection And Metallurgy, is the qualifying exam for the Welding Inspection and Metallurgy Certification certification, which sits at the Specialist level. Earning it shows employers that you have the skills the credential stands for, and it is a solid step forward on a API career path. It also connects to API 510 Pressure Vessel Inspector, API 570 Piping Inspector, API 653 Aboveground Storage Tank Inspector, so the effort you put in now keeps paying off as you advance.
The API-577 exam gives you 110 (100 scored, 10 pre-test) questions to complete within 195 minutes. Do the math before exam day: divide the total time by the question count to set a steady per-question pace, and flag any item that stalls you so you can return to it after securing the easier points. The most reliable way to build that rhythm is a full timed practice test under the same limit, which is exactly what Lead2Passed's test engines are designed for.
The passing score for API Welding Inspection And Metallurgy is Scaled score, approximately 70%, and the official registration fee is $440 USD. Keep in mind that a retake means paying that fee again in full, which makes an honest self-check worthwhile: before you book, sit a timed practice test and make sure you are consistently scoring above the passing line with some margin to spare.
According to the official requirements: Hold current API 510, 570 or 653 certification; or BS/BE + 1 year experience; or 2-year degree + 2 years experience; or high school + 3 years experience (all within last 10 years). Eligibility rules do change from time to time, so confirm the current details on the official exam page before you register.
Registration for the API-577 exam is handled through the official channels below:
The exam is delivered in the following format: Online remote proctored or in-person at Prometric test centers. Pick a date that leaves room for at least one full timed practice test beforehand.
API recommends the following official training options for candidates preparing for API Welding Inspection And Metallurgy:
Courses build the foundation, but they work best alongside question practice. That is where Lead2Passed comes in: the 112 practice questions in our API-577 package let you rehearse the exam format at your own pace and see exactly where you stand.
Yes — Lead2Passed offers a free PDF demo of the API Welding Inspection And Metallurgy material, so you can review the question style and answer quality before you spend anything. After purchase, you also receive 365 days of free updates, and if your product expires you can extend the update service at a 50% discount from your member zone.
If you take the corresponding exam within 60 days of your purchase and do not pass, you are covered by the 100% Money Back Guarantee under clear conditions. To claim a full refund, submit a scan of your exam enrollment slip and your official Score Report PDF within two days of the exam; requests are processed within seven days. Note that sitting the exam within three days of purchase is not eligible, purchases that were never followed by an exam sitting do not qualify, free materials and expired orders are excluded, and the candidate name must match the payer name. Prefer an exchange instead? You can swap your product for two free exam packages of equal value and keep your update service. Delivery is immediate: your API-577 material is ready for instant download and is also emailed to you within one minute of payment — contact customer service if nothing arrives within two hours. There is no limit on the number of computers you can install it on.
The current API Welding Inspection And Metallurgy syllabus is organized into 6 exam domains. The first three are:
- Industry Applications and Standards (10%)
- Welding Processes (20%)
- Welding Materials and Consumables (15%)
For the full domain and subtopic breakdown, see the Exam Topics section above — that is the outline your Lead2Passed practice questions are mapped to.
API Welding Inspection And Metallurgy Sample Questions:
To avoid burn through during in-service welding on thinner wall equipment, it is generally recommended to:
- A. Maximize weaving the bead.
- B. Minimize weaving the bead.
- C. Use high heat input.
- D. Use larger diameter electrodes.
Correct Answer: B 🗳️
When performing a carbon steel to carbon steel hot tap where the CE of one of the metals is greater than
0.42%, which of the following electrodes should be used?
- A. E7018
- B. E7048-H4
- C. E7018-A1
- D. E7048
Correct Answer: A 🗳️
Refer to the following diagram:
Item#4 represents:
- A. groove angle.
- B. bevel face.
- C. groove face.
- D. bevel angle.
Correct Answer: D 🗳️
Heating a round bar to an elevated temperature and then quenching one end is a test method to determine:
- A. Heat treatability.
- B. Temper embrittlement.
- C. Hardenability.
- D. Thermal conductivity.
Correct Answer: C 🗳️
What is the maximum temperature at which ACFM may be used?
- A. 300°F (150°C)
- B. 1000°F (540°C)
- C. 500°F (260°C)
- D. 900°F (480°C)
Correct Answer: C 🗳️
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