API RECOMMENDED PRACTICE FIRST EDITION, OCTOBER Welding Inspection and Metallurgy. 1 Scope. API provides guidance on welding. Welding Processes, Inspection, and. Metallurgy. API RECOMMENDED PRACTICE SECOND EDITION, DECEMBER The objective of the API Welding Inspection and Metallurgy certification program is to and Metallurgy based on the information contained in API RP

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Equipment used to view Alternatively, the weld may be radiographed with the radi- radiographs for interpretation will provide a light source suf- ation beam positioned such that both walls are superimposed. Insulation applied to the component where required for should be brought to the attention of those responsible for the local heating.

Ensure all filler metals, base materials, and backing ring materials are properly marked and identified and if required, c. Sign into or create your free personal account Sign in via Shibboleth What is Shibboleth? Include a sketch of indication. The and surface cleanliness of the weld metal. In-service hardness testing may involve the use of portable variations of the above-described methods.

The parts of a weld comprises three tion of refinery and chemical plant equipment are used in the zones, the weld metal, heat-affected metal zoneand base wrought form rather than cast. Minimum preheat temperature including preheat mainte- One WPS may be qualified by more than one PQR within the nance requirements and maximum interpass temperature the limitations of the code.

API | API – Welding Inspection and Metallurgy

Adn inspection includes much 3. ASNT Central Certification Program This recommended practice does not require all welds to CP Standard for Qualification and Certifica- be inspected; nor does it require welds to be inspected to spe- tion of Nondestructive Testing Personnel cific techniques and extent.

Digital pyrometer or temperature sensitive crayons—mea- graduations to suit the needs of the inspector considered a sures preheat and interpass temperatures. Weld joint designs and dimensions clearly specified see welder performance. Current revision and date, if revised.

The most influential are: Their electrical resistance is also erties of gas shielding provided by the decomposition of flux- much lower, and as a result, less heat is generated in the pro- ing materials or the direct introduction of shielding gases cess of carrying an electrical current.


Scale is indicated by a suffix combination of H for the outer fiber by bending the specimen to a specified radius Hardness, R for Rockwell and then a letter indicating scale that is based on the type of material and specimen thickness. This the HAZ is dependent on the heat input used during welding. The welding arc should be protected from air drafts that will disperse the shielding gas.

The second step is to verify the variables. Click here to Renew. The portion of the base determining the suitability of some material or component for metal whose mechanical properties or microstructure have its intended purpose using techniques that do not affect its been altered by the heat of welding or thermal cutting. An irregular darker density near the center running across the width of the weld image.

Direct current welding is typically from the tip of a consumable covered electrode, to melt the performed with the electrode negative DCEN polarity.

API 577 Welding Inspection and Metallurgy

Bx extend meyallurgy temperature envelope. These standards are not intended to obviate the need for apply- ing sound engineering judgment regarding when and where these standards should be utilized. Codes and the hazard of radiation, and the licensing requirements, the specifications may list compliance with these requirements as cost can be higher and the trained and certified personnel mandatory.

Figure 9 shows a schematic of the self-shielded c. Weld joint type, bevel angle, root face and root opening 4. Steel ruler—available in a wide selection of sizes and f.

Review mock-up weldment problems with welding remove welds and make weld repairs as required.

The specimen is usually bent in a spe- A letter has been assigned to each combination of load and cial guided test jig. Ovens should be heated by electrical The grouping does not Welding materials refers to the many materials involved in imply that base metals or filler metals within a group may be welding including the base metal, filler metal, fluxes, and indiscriminately substituted for a metal, which was used in gases, if any.


These images can be size and location.

Feathery, twisted line of darker density 2. Dilution of alloying elements from base metal. Cracks and tears resulting from a lack of Vickers hardness testing follows the Brinell principle as ductility or discontinuities in the weld metal are evaluated for far as the hardness is calculated from the gp of load to acceptance or rejection to the applicable code requirements.

This dimension is based on the assumption that ing and upon completion of welding, although it is usually the root opening is equal to zero not necessary to inspect every weld. Figures 7 and 8 show a schematic wall equipment or a nozzle attachment.

API 577 – Welding Inspection and Metallurgy

After the specimen has been fractured, the two halves should be used with caution when applied to welded joints or of the fractured tensile specimen are fitted back together as any metal with a heterogeneous structure.

Reviewer and level of certification. When performing the bubble test, some requires test areas to be ground flat or even flush with the base items of concern include the temperature of surface to be metal to accommodate the hardness metallrgy instrument in the inspected, pre-test and post-test cleaning of the part to be area of interest.

The both metals are in accordance with codes and the WPS docu- type of notch anf the impact test temperature are generally mentation. Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all the applicable requirements of that standard.

Codes and specifications may list the metal and reflects from an interface. In addition, a sys- the ultrasonic equipment is not functioning properly, all tem check is required with any change in the search unit, areas tested since the last successful calibration should be cabling, and examiner.

Surface and slightly subsurface c.