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API st 582-2001 pdf free download

API st 582-2001 pdf free download.Welding Guidelines for the Chemical, Oil, and Gas Industries.
4 General Welding Requirements 4.1 Structural (non pressure boundary) welding require- ments shall comply with either AWS D1.1 or AWS D1.6. When approved by the purchaser (engineer) welding proce- dures may be qualiÞed per ASME Section IX. 4.2 Pre-qualiÞed welding procedures per AWS D1.1 and D1.6 are acceptable for structural welding. 4.3 All welding procedure speciÞcations (WPSÕs) and pro- cedure qualiÞcation records (PQRÕs) shall be submitted to the purchaser for review and approval prior to the start of fabrica- tion or construction unless submittal is waived by the pur- chaser. Weld maps, similar guides or fabrication drawings which clearly identify the application of each WPS, indicat- ing where and how these WPSÕs will be used, shall be included in the submittal. 5 Welding Processes 5.1 ACCEPTABLE WELDING PROCESSES Acceptable welding processes are: a. Shielded Metal Arc Welding (SMAW). b. Gas Tungsten Arc Welding (GTAW) and Pulsed GTAW (GTAW-P). c. Gas Metal Arc Welding (GMAW) for the following transfer modes: i. Spray (GMAW-Sp). ii. Short Circuiting (GMAW-S). iii. Pulsed (GMAW-P). iv. Globular (GMAW-G). d. Submerged Arc Welding (SAW). e. Electrogas Welding (EGW). f. Flux Cored Arc Welding (FCAW). g. Plasma Arc Welding (PAW). h. Other welding processes approved by the purchaser. 5.2 LIMITATIONS OF FUSION WELDING PROCESSES The fusion welding processes listed in 5.1 are acceptable with restrictions and comments contained in 5.2. 5.2.1 Automatic Pulsed Gas Tungsten Arc Welding (GTAW-P) When used for root pass welding of single-sided joints, welding shall be performed with the same make and model of welding system using the same equipment and/or program settings as those used in the procedure qualiÞcations.
5.2.2 Short Circuiting Gas Metal Arc Welding (GMAW-S) The use of GMAW-S shall be limited to the following conditions: a. The process shall not be used for branch connections or socket welds. b. For vertical welding, the root pass and second pass pro- gression for a material of any thickness may be either uphill or downhill. c. The Þll and cap pass for butt or Þllet welds may be welded with this process provided the thickness of any member does not exceed 3 / 8 in. (9.5 mm) and vertical welding is performed with uphill progression. 5.2.3 Pulsed Gas Metal Arc Welding (GMAW-P) GMAW-P may be used for any material thickness in any position. Commentary : Whenever the welding system is changed or the settings on existing equipment signiÞcantly altered, the fabricator should verify weld properties. The extent of veriÞ- cation or testing should be as agreed between the purchaser and fabricator. 5.2.4 Flux Cored Arc Welding (FCAW) Self-shielding FCAW (FCAW-S) may be used only for welding carbon steel structural items. The following guidelines and restrictions apply: a. Electrode types identiÞed by the consumable manufac- turer for multipass application should be used. b. Only electrode classiÞcations which have speciÞed mini- mum impact test requirements should be used. c. FCAW-S shall not be used with other welding processes without qualifying the speciÞc combination. FCAW with external gas shielding (FCAW-G) may be used for either groove or Þllet welds for pressure boundary or structural welding. For procedures requiring either impact or hardness testing, weld metal properties should be reviewed with the consumable manufacturer to ensure the original qualiÞed properties continue to be met.
5.3 SINGLE-SIDED WELDED JOINTS For single-sided welded joints where process side corro- sion is a concern, welding processes using coatings or ßuxes shall not be used for root pass welding of austenitic stainless steel and nickel-based alloys unless slag can be removed from the process side of root passes and the area inspected for slag removal. 5.4 COMBINING WELDING PROCESSES Combining two or more welding procedures that use alloy Þller metals of different nominal compositions, other than A1 through A5, requires qualiÞcation as a combination procedure. 5.5 MECHANIZED AND AUTOMATED WELDING PROCESSES 5.5.1 Orbital welding and similar fully automated welding processes require separate programming weld schedules for the speciÞc joint geometry, diameter, wall thickness, and weld- ing position. These weld schedules shall report all the essential and non-essential variables that are needed to accurately describe all motion (e.g., direction of travel, travel speed, and oscillation), timing and electrical functions of the welding sys- tem. The speciÞc weld schedules relevant to each welding pro- cedure shall be noted on the WPS or as a supplementary table attached to the WPS.

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