ASME BPVC Section VIII Division 1 · 2025 Edition
UG-84: Charpy Impact Test Requirements
A complete technical reference covering test procedures, specimen geometry, temperature criteria, acceptance values, retesting rules, and weld toughness qualification requirements for pressure vessel construction.
Charpy V-Notch
MDMT
2025 Edition
Subsection C & D
Table of Contents
- Introduction & Scope (UG-84.1)
- Test Procedures & Apparatus (UG-84.2)
- Test Specimens — Size, Type & Geometry (UG-84.3)
- Test Temperature Requirements (UG-84.4)
- Acceptance Criteria (UG-84.5)
- Retesting Rules (UG-84.6)
- Impact Tests of Material (UG-84.7)
- Impact Testing of Welds & HAZ (UG-84.8)
- Production Impact Testing (UG-84.9)
- Summary & Key Takeaways
1. Introduction & Scope — UG-84.1
Impact testing is a critical safeguard in pressure vessel design, ensuring that materials and weldments can withstand brittle fracture at low temperatures. Paragraph UG-84 of ASME BPVC Section VIII Division 1 (2025 Edition) establishes the complete framework for Charpy V-notch (CVN) impact testing of vessel parts and weldments. To understand the full picture of the Charpy test — its principle, pendulum mechanics, and energy absorption physics — read our detailed article on the Charpy Impact Test: Principle, Procedure, Specimen, Results & Importance.
UG-84.1 — Code Language: Charpy V-notch impact testing of weldments and vessel parts subject to stress due to pressure shall be performed in accordance with the provisions of this paragraph when required by the rules in Subsection C or Subsection D.
Impact testing under UG-84 is therefore conditionally mandatory — it is triggered by the material selection rules in:
- Subsection C — Rules for Construction of Pressure Vessels (Ferritic & Carbon Steels — UCS)
- Subsection D — Rules for Construction of Pressure Vessels (High-Alloy Steels — UHA; Heat-Treated Steels — UHT)
The primary driver for mandatory impact testing is the establishment of the Minimum Design Metal Temperature (MDMT). When a vessel is intended for low-temperature service, or when its governing MDMT falls in a range where the selected material cannot be assumed to be inherently tough, UG-84 testing becomes mandatory.
Note per UG-20(f): Impact testing per UG-84 is NOT mandatory for pressure vessels in which the MDMT is warmer than −20°F (−29°C) and where the material satisfies the exemption rules of UCS-66 or UCS-68. Engineers must evaluate UCS-66 exemption curves before ordering impact tests.
Related Reading
New to ASME codes? Get the foundation right — read our ASME BPVC Section IX Brief Introduction to understand how procedure qualification, welding variables, and construction code hierarchy work together with Section VIII requirements.
2. Test Procedures & Apparatus — UG-84.2
UG-84.2 governs how impact tests shall be conducted, referencing internationally recognised test standards and specifying how different product forms and lot sizes are handled.
2.1 Procedures and Apparatus
Impact test procedures and apparatus shall conform to the applicable paragraphs of:
- SA-370 — Standard Test Methods and Definitions for Mechanical Testing of Steel Products (ASTM A370)
- ISO 148 (Parts 1, 2, and 3) — Metallic materials — Charpy pendulum impact test
2.2 Product Form Requirements
When impact testing is required and no procedural impact testing requirements are given in the material specification, each product form of material shall comply with the requirements of the applicable product form specification. Table UG-84.2-1 lists these specifications:
| Product Form | Specification No. |
|---|---|
| Plates — Parts UCS and UHT | SA-20, S5 |
| Plates — Part UHA | SA-480 |
| Pipe | SA-333 |
| Tubes | SA-334 |
| Forgings | SA-350 |
| Castings | SA-352 |
| Bolting Materials (and bars) | SA-320 |
| Piping Fittings | SA-420 |
2.3 Small Parts — Lot Certification
A lot of up to 20 duplicate small cast or forged parts may be certified by testing one set of impact test specimens removed from a single randomly selected part produced of the same specification, heat of material, and heat treatment condition. No impact tests are required when the parts are too small to provide three test specimens meeting the minimum specimen size.
2.4 Small Vessels — Lot Certification
A lot of up to 100 small vessels complying with U-1(j) may be certified by one set of material impact test specimens removed from a single vessel produced of the same heat of material and heat treatment furnace batch.
3. Test Specimens — Size, Type & Geometry — UG-84.3
3.1 Specimen Set
Each set of impact test specimens shall consist of three (3) test specimens removed from each area required to be tested. For a thorough understanding of how mechanical test specimens are removed and oriented from weld coupons, refer to our guide on Mechanical Testing in ASME Section IX — which covers specimen extraction locations, objectives, and acceptance for groove weld PQR qualification in detail.
3.2 Specimen Type and Geometry
The specimens shall be the Charpy V-notch (CVN) type conforming in all respects to Figure UG-84.2-1. The key dimensional requirements are:
| Dimension | Imperial | Metric |
|---|---|---|
| Full-size specimen width × height | 0.394 in. × 0.394 in. | 10 mm × 10 mm |
| Overall length | 2.165 in. | 55 mm |
| Notch depth | 0.315 in. | 8 mm |
| Notch root radius | 0.010 in. | 0.25 mm R |
| Notch angle | 45° | |
3.3 Full-Size Specimen Applicability
Except as permitted for subsize or alternative specimens, standard full-size 0.394 in. × 0.394 in. (10 mm × 10 mm) test specimens shall be obtained from nominal material thicknesses of 7/16 in. (11 mm) or greater.
3.4 Subsize Specimens
When full-size specimens cannot be obtained, the test specimens shall be the largest obtainable standard subsize specimens. Alternatively, testing may be performed on specimens using the full nominal material thickness after machining to remove any surface irregularities.
Important: Impact tests are not required when the maximum obtainable test specimen has a width along the notch of less than 0.099 in. (2.5 mm).
3.5 High-Energy Materials — Alternative Subsize (UG-84.3(c))
For materials demonstrating absorbed energy greater than 180 ft-lb (244 J) when testing full-size specimens at the specified test temperature, 0.394 in. × 0.262 in. (10 mm × 6.7 mm) subsize specimens are acceptable in lieu of full-size specimens. The applicable acceptance criteria are covered under UG-84.5(g).
| Specimen Designation | Width — Imperial | Width — Metric |
|---|---|---|
| Full-size standard bar | 0.394 in. | 10 mm |
| 3/4-size bar | 0.295 in. | 7.5 mm |
| 2/3-size bar | 0.262 in. | 6.7 mm |
| 1/2-size bar | 0.197 in. | 5.00 mm |
| 1/3-size bar | 0.131 in. | 3.3 mm |
| 1/4-size bar | 0.099 in. | 2.5 mm |
4. Test Temperature Requirements — UG-84.4
The test temperature is one of the most critical parameters in Charpy impact testing. UG-84.4 defines the temperature at which impact tests shall be performed relative to the MDMT.
4.1 General Rule — UG-84.4(a)
Except when otherwise permitted by Table UG-84.4-1, the impact test temperature shall be no warmer than the MDMT, where materials have:
- Nominal thickness ≥ 0.394 in. (10 mm) and the largest obtainable specimen width ≥ 0.315 in. (8 mm)
- Nominal thickness < 0.394 in. (10 mm) and the largest obtainable specimen width ≥ 80% of nominal thickness
- Nominal thickness < 0.394 in. (10 mm) with specimen width < 80% of thickness, for high-strength materials: Table UCS-23 with Su ≥ 95,000 psi (655 MPa), all Table UHT-23, and all Table UHA-23 materials
4.2 Warmer Test Temperature Allowance — Table UG-84.4-1
Table UG-84.4-1 permits the impact test temperature to be warmer than the MDMT for low-yield-strength materials:
| Minimum Specified Yield Strength, ksi (MPa) | Temperature Difference, °F (°C) — Note (1) |
|---|---|
| ≤ 40 ksi (280 MPa) | 10°F (6°C) |
| ≤ 55 ksi (380 MPa) | 5°F (3°C) |
| > 55 ksi (380 MPa) | 0°F (0°C) |
| NOTE (1): Impact test temperature may be warmer than the minimum design temperature by the amount shown. | |
4.3 Colder Test Temperature — UG-84.4(b) & Table UG-84.4-2
Except when applying the alternative rules of UG-84.3(c), the impact test temperature shall be colder than the MDMT by an amount equal to the difference between the temperature reductions shown in Table UG-84.4-2, for Table UCS-23 materials with Su < 95,000 psi (655 MPa), nominal thickness < 0.394 in. (10 mm), and specimen width < 80% of nominal thickness.
| Actual Material Thickness or Charpy Specimen Width Along Notch | Imperial | Metric | Temperature Reduction, °F (°C) |
|---|---|---|---|
| Full-size standard bar | 0.394 in. | 10 mm | 0°F (0°C) |
| — | 0.354 in. | 9 mm | 0°F (0°C) |
| — | 0.315 in. | 8.00 mm | 0°F (0°C) |
| 3/4-size bar | 0.295 in. | 7.5 mm | 5°F (3°C) |
| — | 0.276 in. | 7 mm | 8°F (4°C) |
| 2/3-size bar | 0.262 in. | 6.7 mm | 10°F (6°C) |
| — | 0.236 in. | 6 mm | 15°F (8°C) |
| 1/2-size bar | 0.197 in. | 5.00 mm | 20°F (11°C) |
| — | 0.158 in. | 4 mm | 30°F (17°C) |
| 1/3-size bar | 0.131 in. | 3.3 mm | 35°F (19°C) |
| — | 0.118 in. | 3.00 mm | 40°F (22°C) |
| 1/4-size bar | 0.099 in. | 2.5 mm | 50°F (28°C) |
| GENERAL NOTE: For Table UCS-23 materials having a specified minimum tensile strength of less than 95,000 psi (655 MPa) when the subsize Charpy impact width is less than 80% of the material thickness. Straight line interpolation for intermediate values is permitted. | |||
4.4 Weld and HAZ Test Temperature
The test temperature for welds and heat-affected zones (HAZ) shall not be warmer than the test temperature required for the base materials. This ensures weld toughness is evaluated at least as rigorously as the base metal.
4.5 Summary Table — UG-84.4(c): Table UG-84.4-3
| Nominal Material Thickness, tn | Test Specimen Thickness, t | Material Conditions | Impact Testing Temperature | Code Para. |
|---|---|---|---|---|
| Any | Any | SMYS < 55 ksi (<380 MPa) | Warmer than MDMT when Table UG-84.4-1 conditions are met | UG-84.4(a) |
| ≥ 0.394 in. (≥ 10 mm) | ≥ 0.315 in. (≥ 8 mm) | All [Note 2] | Not warmer than MDMT | UG-84.4(a)(1) |
| < 0.394 in. (< 10 mm) | ≥ 0.8 tn | All [Note 2] | Not warmer than MDMT | UG-84.4(a)(2) |
| < 0.394 in. (< 10 mm) | ≥ 0.8 tn | Su ≥ 95 ksi (≥655 MPa), all Table UHT-23 & UHA-23 | Not warmer than MDMT | UG-84.4(a)(3) |
| < 0.394 in. (< 10 mm) | < 0.8 tn | Su < 95 ksi (<655 MPa) Table UCS-23 [Note 2] | Colder than MDMT per Table UG-84.4-2 | UG-84.4(b) |
| SMYS = specified minimum yield strength; Su = specified minimum tensile strength. Note (2): Except for materials addressed in UG-84.3(c). | ||||
5. Acceptance Criteria — UG-84.5
5.1 Table UCS-23 Materials — Su < 95,000 psi (655 MPa) — UG-84.5(a)
These materials shall have an impact energy value not less than shown in Figure UG-84.5-1 (or UG-84.5-1M for SI units), multiplied by the ratio of the actual test specimen width along the notch to the width for a full-size test specimen (correction for subsize specimens).
Key Concept — Figure UG-84.5-1 Impact Energy Requirements
The figure plots minimum average Charpy energy (Cv, ft-lb or J) versus maximum nominal thickness of material or weld (in. or mm) for different minimum specified yield strength levels. The curves reflect that thicker material and higher-strength steel require higher impact energies.
- Minimum specified yield strength curves: ≤ 38 ksi, 45 ksi, 50 ksi, 55 ksi, 65 ksi, 80 ksi (≤ 260, 310, 350, 380, 450, 550 MPa)
- Interpolation between yield strength values is permitted
- The minimum impact energy for any single specimen shall not be less than 2/3 of the average energy required for three specimens
- The average impact energy value of the three specimens may be rounded to the nearest ft-lb (J)
5.2 Table UCS-23 Materials — Su ≥ 95,000 psi (655 MPa) — UG-84.5(b)
These high-strength materials shall have a lateral expansion opposite the notch not less than required in UHT-6(a)(3) and UHT-6(a)(4).
5.3 Part UHT Materials — UG-84.5(c)
Part UHT materials shall meet all requirements of UHT-6(a)(3) and UHT-6(a)(4).
5.4 Table UHA-23 Materials — UG-84.5(d)
Table UHA-23 materials shall meet all requirements of UHA-51.
5.5 Specification-Tested Materials — UG-84.5(e)
Materials produced and impact tested in accordance with the material specifications listed in Figure UG-84.5-1 General Note (c) — including SA-320, SA-333, SA-334, SA-350, SA-352, SA-420, SA-437, SA-540, SA-765, and impact-tested SA/AS1548 (L designations) — shall meet the specified acceptance criteria of the relevant material specification, and do not have to satisfy the Figure UG-84.5-1 energy values.
5.6 Weld and HAZ Acceptance — UG-84.5(f)
Test specimens for welding procedure qualification with impact testing of welds and heat-affected zones, and for production impact testing, shall achieve impact test values at least as high as those required for the base materials.
5.7 Subsize Specimens per UG-84.3(c) — UG-84.5(g)
For materials tested using subsize specimens as permitted by UG-84.3(c):
- The minimum acceptance criteria for each of the subsize test specimens shall be 75 ft-lb (102 J)
- The lateral expansion in mils (mm) shall be reported
Related Reading — Mechanical Testing
Impact testing is just one of several mechanical test methods for welds. For a comparison with guided bend testing — including specimen extraction, acceptance criteria, and how both tests are used together in a PQR — see our guide on Bend Testing: A Complete Technical Guide in Welding and Material Evaluation.
6. Retesting Rules — UG-84.6
UG-84.6 allows a retest when the original test fails to meet acceptance criteria under specific conditions.
6.1 When a Retest Is Permitted — UG-84.6(a)
A retest is permitted when one of the following conditions is met for the original test:
Condition 1
The average value is satisfied AND only one specimen has a value below two-thirds of the average value required.
Condition 2
All three specimens have a value above two-thirds of the average value required for three specimens.
When a retest is permitted, three additional test specimens shall be removed from the same test coupon. The acceptance criteria for each of the retest specimen coupons shall equal or exceed the required average value given in UG-84.5(a).
6.2 Erratic Results or Defective Specimen — UG-84.6(b)
When an erratic result is caused by a defective specimen or there is uncertainty in test procedure, a retest is permitted.
6.3 Retest Using Full-Size Specimens — UG-84.6(c)
When the rules of UG-84.3(c) are applied for the initial test and the minimum acceptance value of 75 ft-lb (102 J) is not achieved, retesting using full-size test specimens is permitted.
7. Impact Tests of Material — UG-84.7
UG-84.7(a) — Mill Test Reports
Reports or certificates of impact testing performed by the material manufacturer demonstrating that the material meets the applicable acceptance criteria of UG-84.5 are acceptable, provided the test specimens comply with the rules of UCS-85, UHT-5, or UHT-81, as applicable.
UG-84.7(b) — Manufacturer’s Testing
When impact testing has NOT been performed by the material manufacturer, the vessel Manufacturer may perform impact tests to prove the suitability of a material.
Related Reading — Material Grouping
Material selection for impact testing is closely tied to P-Numbers and Group Numbers. A change in material group may trigger requalification of the WPS with supplementary essential variables. See our article on P-Number, Group No, F-Number and A-Number in Welding to understand how materials are categorised and how that affects your impact testing obligations.
8. Impact Testing of Welds and Heat-Affected Zones — UG-84.8
8.1 WPS Qualification with Impact Testing — UG-84.8(a)
Welding Procedure Specifications (WPSs) shall be qualified with impact testing when required by UCS-67, UHT-82, or UHA-51. This is where the concept of supplementary essential variables becomes critical. Any change that affects notch toughness of the weld metal, HAZ, or base material constitutes a supplementary essential variable and, when impact testing is required by the construction code, becomes an additional essential variable requiring WPS requalification. For a complete breakdown of which variables are supplementary for SMAW, GTAW, SAW, and GMAW, read our dedicated guide: Supplementary Essential Variables — ASME Section IX.
When welding procedure qualification with impact testing is required:
- The material used for the test coupon shall meet the minimum toughness requirements for the thickest base material thickness of the range qualified by the procedure [per Figure UG-84.5-1]
- The welding procedures used for fillet welds shall be qualified by groove welded test coupons
- The supplementary essential variables in Section IX, QW-250 shall apply
Practical Guide — WPS & PQR Preparation
When impact testing is mandated, the WPS and PQR must explicitly document the impact test conditions, test temperatures, and results. Learn the complete step-by-step process in our guide: How to Prepare a WPS and PQR: What Every Fabricator Must Know.
8.2 Weld Metal Specimen Removal — UG-84.8(c)(1)
Each set of weld metal test specimens shall be taken transverse to the weld axis and prepared with:
- The notch located in the weld metal, perpendicular to the surface of the material
- One face of the specimen within 1/16 in. (1.5 mm) of the surface of the material (except when the weld has been postweld heat treated, specimens may be removed from any depth)
8.3 HAZ Specimen Removal — UG-84.8(c)(3)
Each set of HAZ test specimens shall be taken transverse to the axis of the weld and of sufficient length to locate the fusion line after etching. Key requirements:
- Use of a single-bevel or double-bevel groove weld design is recommended to maximise the HAZ in the specimen
- For material less than 1 in. (25 mm) thick, HAZ specimens shall be removed from a depth that maximises the amount of HAZ at the notch centerline
- For material 1 in. (25 mm) or greater, test specimens shall be removed with centerlines between 1/4 and 1/2 of the material thickness below the surface
- The notch shall be normal to the material surface
- When the HAZ angle is approximately normal to the surface, the notch centerline shall be approximately 0.04 in. (1 mm) from the fusion line
- When the HAZ is at an angle to the material surface, the middle of the notch centerline shall be located approximately 0.08 in. (2 mm) from the fusion line
8.4 Multi-Process Test Coupons — UG-84.8(d)
Each welding process may be qualified using single-process or multi-process test coupons. When more than one welding process is included in a test coupon:
- The test specimens shall be full-size or the largest obtainable subsize based on coupon thickness
- Weld metal specimens shall contain as much weld metal from each process as practical
- When more than two welding processes are used, additional weld metal impact specimens shall be removed from the thickness depth where each process is located
- HAZ test specimens shall be removed from the thickness depth associated with deposited weld metal from each process
8.5 Dissimilar Base Metals — UG-84.8(e)
When qualifying a WPS for welding base metals with different impact testing requirements and acceptance criteria:
- Weld metal impact test specimens shall meet the acceptance criteria for either base metal
- Separate HAZ impact test specimens shall be removed from the HAZ of each base metal requiring impact testing
- Each set of HAZ specimens shall meet the acceptance criteria for the base metal from which they were removed
8.6 P-No. Material Qualification Condition — UG-84.8(b)
Except for P-No. 1, Group Nos. 1 and 2 materials other than SA-737 and SA-841, the weld test coupon material for vessels constructed of Part UCS materials shall be in the same material heat treatment condition before welding (as-rolled, normalized, quenched and tempered, etc.) as the material of construction. The test coupons shall be subjected to the same postweld heat treatment established by the Manufacturer for production.
9. Production Impact Testing — UG-84.9
9.1 General — UG-84.9(a)
Impact tests of welds and HAZs of production test coupons shall be made in accordance with UG-84.8 for each welding procedure followed on each vessel or group of vessels.
Inspector’s Reference
Production impact testing is one of many quality checkpoints that welding inspectors must track before, during, and after fabrication. For a complete inspection framework including WPS review, hold points, and documentation requirements, see our Welding Inspection Checklist: Before, During, and After Welding.
9.2 Test Coupon Requirements — UG-84.9(b)
The production impact test coupon shall be from one of the heats of steel used for the vessel or group of vessels.
- Category A joints: Where practicable, the test coupon shall be welded as an extension to the end of a production joint
- Category B joints (different procedure from Category A): A test coupon shall be welded concurrently with the production welds, or as close to the start of production welding as practicable, using the same equipment, at the same location, and the same procedure
9.3 When Production Impact Test Coupons Are Required — UG-84.9(c)
Production impact test coupons shall be made for all joints for which impact tests are required for qualifying the welding procedure by UCS-67, UHT-82, or UHA-51. Welding positions:
- Automatic, machine, or semiautomatic welding: A test coupon shall be made in each position employed in vessel welding
- Manual welding: A manually welded test coupon shall be made in the flat position
- Other positions: A test coupon shall be made in the vertical position, with major layers deposited using vertical uphill progression
For a comprehensive reference on how welding positions are defined and qualified under ASME Section IX and ISO 6947, including position tolerance angles and equivalency charts, visit our Complete Guide to Welding Positions.
9.4 Number of Vessel Impact Test Coupons — UG-84.9(d)
| Scenario | Requirement |
|---|---|
| Single vessel | One test coupon for each welding procedure used for Category A and B joints |
| Several vessels (group qualification) | Minimum one coupon per welding procedure — welding completed within any 3-month period at one location; cumulative joint length ≤ 400 ft (120 m) per procedure; same material spec & grade; thickness variation ≤ greater of 1/4 in. (6 mm) or 25% |
| Small vessels per U-1(j) | One welded test joint may represent one lot of ≤ 100 vessels or one heat treatment furnace batch — same heat of material, filler metal, and welding procedure |
9.5 Test Failure — UG-84.9(e)
Consequence of Failure: If the production impact test specimen fails to meet the impact testing requirements, the welds represented by the test specimen shall be unacceptable. Reheat treatment and retesting, or retesting only, are permitted.
Related Reading — Welder Qualification
Beyond procedure qualification, individual welders must also be qualified to produce the welds covered by an impact-tested WPS. Understand the complete framework for performance qualification — including diameter restrictions, position ranges, and re-qualification triggers — in our guide on ASME Section IX Welder Qualification: A Complete Guide to WPQ.
10. Summary & Key Takeaways
🧪
Trigger
UG-84 applies when Subsection C (UCS) or Subsection D (UHT/UHA) rules mandate it — primarily for vessels with MDMT below exemption curves.
📐
Specimen
Three CVN specimens per set; full-size 10 mm × 10 mm for thicknesses ≥ 11 mm; subsize for thinner material; tests per SA-370 or ISO 148.
🌡️
Temperature
Generally not warmer than MDMT. Table UG-84.4-1 allows slight warming for low-yield steels; Table UG-84.4-2 requires colder tests for very thin subsize specimens.
✅
Acceptance
Average of three specimens ≥ Figure UG-84.5-1 value; no single specimen below 2/3 of the average. High-strength & UHT materials: lateral expansion criteria.
🔄
Retesting
Permitted when one specimen is slightly below 2/3 average, or all three are above 2/3. Three additional specimens required; each retest coupon must equal or exceed required average.
🔩
Welds & Production
WPS must be impact-tested if required. Production coupons required per welding procedure. Failed production tests render represented welds unacceptable.
📚 Further Reading on WeldFabWorld
Charpy Impact Test — Principle, Procedure & Importance
Understand the physics of the CVN test, DBTT, and how energy absorption maps to material toughness.
Supplementary Essential Variables — ASME Section IX
Complete breakdown for SMAW, GTAW, SAW, GMAW when impact testing governs WPS qualification.
Mechanical Testing in ASME Section IX — Complete Guide
P-Number, Group No, F-Number and A-Number in Welding
Material grouping that drives PQR qualification scope and impact testing obligations.
Welding Inspection Checklist: Before, During & After
ASME Section IX Welder Qualification (WPQ) — Complete Guide
Welder/operator performance qualification requirements, diameter restrictions, and position ranges.
Bend Testing — Complete Technical Guide
🎯 Test Your Knowledge
Think you’ve mastered ASME Section VIII Division 1? Put yourself to the test with our official quiz.
References
- ASME BPVC Section VIII Division 1 — 2025 Edition, Paragraph UG-84
- ASME BPVC Section VIII Division 1 — 2025 Edition, Paragraphs UCS-66, UCS-67, UCS-85
- ASME BPVC Section VIII Division 1 — 2025 Edition, Paragraphs UHT-5, UHT-6, UHT-81, UHT-82
- ASME BPVC Section VIII Division 1 — 2025 Edition, Paragraph UHA-51
- SA-370 — Standard Test Methods and Definitions for Mechanical Testing of Steel Products
- ISO 148 (Parts 1, 2, 3) — Metallic materials — Charpy pendulum impact test
- ASME Section IX — QW-250 (Supplementary Essential Variables)
- WeldFabWorld: Charpy Impact Test — Principle, Procedure, Specimen, Results & Importance
- WeldFabWorld: Supplementary Essential Variables — ASME Section IX
This article is intended for educational and reference purposes. Always consult the official ASME BPVC documents and qualified engineering professionals for design and compliance decisions. All code references are to the ASME BPVC Section VIII Division 1 — 2025 Edition.