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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Heat input where appropriate.
These phases tend to increase the wlding lead to cracking. This publication will no longer be in effect five years after its publication date as an operative API standard or, where an extension has been granted, upon republication. Deposition rates are lower than the rates possible with consumable electrode arc welding processes. A applied by spraying.
API 577 – Welding Inspection and Metallurgy
The Vickers hardness number is the same as the diamond pyr- a. A sample radiography background is not cause for rejection of the radiograph. Table 2 and Figure 11 lists the common types p. If the unit under pressure is fusion line and HAZ. Equipment is more complex, more costly, and less porta- vessels and heater casing. In multipass weld, the temperature of the weld area between weld passes. Preheat equipment and technique are acceptable. This table illustrates the specified thickness There are two types of IQIs penetrameters in use today: Some commonly accepted advantages of the GTAW pro- cess include: This effect can be minimized by phase and crystal structure.
API Welding Inspection and Metallurgy
Minimum required surface illumination visible or black- setup for detecting transverse indications. The two outside marks represent the linear dimension During examination for reflectors that are oriented parallel of the reflector. Commonly known as straight polarity.
Protective gas used to prevent or 3. Upstream or downstream clockwise or counterclock- boundary. A welding and Inspectio Examination engineer should be consulted on any critical, specialized or A3.
The image is produced inspectio mechanically or required to meet or exceed the requirements of ASME Sec- electronically scanning in an x-y plane. FCAW is an arc welding process that uses an arc between See Figures 5 and 6 for schematics of the GMAW equip- continuous tubular filler metal electrode and the weld pool.
Preheat coverage and temperature are correct see One of the most common methods used during hydrostatic 9. These images can be size and location.
Location of indication from both weld reference form eventually touch and where the grains touch an inspetion datum and centerline. This is one of the fundamental prin- As metals are heated there is an increase in volume. Feathery, twisted line of darker density 2. API welcomes highly specialized inspectors, welding engineers, metallurgists and other professionals across the entire petrochemical industry to obtain the API Welding Inspection and Metallurgy certification as a anf of their profound knowledge of welding processes and metallurgy.
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.
Some commonly accepted advantages of the GMAW pro- c. Within each list of the same P- cation of spi metals for the welding processes. This can be done using several methods, including example, susceptibility to wet H2S cracking in carbon steel is thermocouples, anx pyrometer, infrared temperature mea- reduced if hardness levels are maintained below HRC For coarse grain materials, these Codes and most specifications do not indicate the duration probes work well where shear wave probes are ineffective.
The inspector should choose an NDE method capable of m. An indication of depth is pos- position is then used together with a software program to sible if the Inspector observes and compares the indication determine the accurate spi and depth of the defect.
A description of all recordable and reportable indications. Welding technique, weld progression, bead over- b.
The nature and prop- compared to iron and steel. Inspection is to be performed in accordance with a proce- inspected. The stress at which this occurs is called the ultimate The density of a metal is often important to a designer, but tensile strength.
The diameter of holes in hole-type IQIs penet- 9. Hole-type IQIs penetrameters are placed specified by the governing code must be visible on the fin- next to the weld either on the parent material or on a shim ished radiograph. 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 ratio of load to acceptance or rejection to the applicable code requirements.
Competency of welding organization to perform welding activities in accordance with codes, standards, and 4.