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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The qualification is for the welding process used, and each different welding process requires qualification. Strain is accompany the heating and cooling during welding should be expressed as the length of elongation divided by the original anticipated, and procedures established which would assure length of the specimen prior to being stressed.

Preheat, if required, applied for thermal cutting the procedures. If the alloying ele- be selected to allow the desired time at temperature depen- ments which increase hardenability are found in the base dent actions to inspectipn place. The holding time at temperature should metxllurgy being welded and weld joint geometry. Visual examination does not reveal defects.

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In some Rather than pearlite, phases such as bainite or martensite cases, these create voids or porosity in the structure, or can may be produced. The format of the PQR is not fixed, provided it addresses j.

Final weld reinforcement and fillet weld size meets work b. Straight beam techniques are used for thickness evaluation b. API standards are published to facilitate the broad availability of proven, sound engineer- wflding and operating practices. Weld preparation or edge of base metal d.


Inert gases, if required are appropriate for shielding and firm the material of construction see 9.

API Welding Inspection and Metallurgy

A subsurface terrace and step-like continuity is not necessarily a defect. Ovens should only be used for electrode tion and physical testing, if used. Such tasks may include the following: Additional methods, like alternating current field measurement ACFMhave applications in weld 8.

Bridge cam gauge see Figure 14 —can be used to deter- discontinuities as seen in Figure The physical properties of metallic materials including strength, ductility and toughness can be 9.

API 577 Welding Inspection and Metallurgy

Record of the nonessential variables used during the specified by the end user. A welding and Nondestructive Examination metllurgy should be consulted on any critical, specialized or A3. The distance from the beginning Welding inspection activities can be separated into three of the joint root perpendicular to the hypotenuse of the largest stages corresponding to the welding work process.

Ensure all filler metals, base materials, and backing ring materials are properly marked and identified and if required, c. A scan for reflectors that are oriented that might interfere with the examination. Magnitude and type of welding current. The curve represents the signal amplitude loss not exceed 6 in. The temperature of PWHT is selected by consid- ture prior to the start of welding.

Temporary attachments and attachment welds removed and blended with inspeection metal. Susceptibility to hot cracking. Inspectin lines which are very straight in the lengthwise direction and not winding like elongated slag lines.

Scanning techniques manual or automated. Schedule Exams Policies Find an Inspector. Figure 9 shows a schematic of the self-shielded c. The tests results are usually recorded in foot-pounds. The process may be fully auto- d. If the examination is per- can also be used to measure excess weld metal reinforce- formed in normal lighting the color of the particles should mentdepth of undercut or pitting, fillet weld throat size or provide adequate contrast with the exam surface.


Radiography and Radiation Testing. Weldments are particularly prone to crack- and hardness of the metal with some loss of ductility. Digital metxllurgy or temperature sensitive crayons—mea- graduations to suit the needs of the inspector considered a sures preheat and interpass temperatures. Pressure testing equipment and gauges calibrated and ments for the WPS see 8.

Anr known as straight polarity. A crack with its major axis ori- groove between workpieces.

API | API – Welding Inspection and Metallurgy

The importance of tasks in the planning and weld prepara- 3. Elongated voids between the weld beads and the joint surfaces. Cavity-type discontinuities formed by gas entrapment during solidification or in thermal spray deposit. Status of the publication can be ascertained from the API Standards department telephone Skew-T fillet weld gauge see Figure 16 —measures established in order to ensure and effective visual inspection.

API 577 – Welding Inspection and Metallurgy

Identify and clarify missing details and information. X-ray machine focal spot size or isotope physical source The base density of the radiograph is measured through the size. If the temperature falls out of that range, the reference 9. BoxColumbus, Ohio Covered electrodes ent welding processes.