API 7:2002 pdf download

API 7:2002 pdf download.Specification for Rotary Drill Stem Elements.
6.4.1.2 procedure qualification record (PQR): The
written documentation that a specific WPS meets the requirements of this specification. The record of the welding data used to wcld a test joint and the test results from specimens taken from the test weld joint.
6.4.1.3 variable, essential: That variable parameter in which a change affects the mechanical propcrties of the weld joint. Changes in essential variables require rcqualification of the WI’S.
6.4.1.4 variable, nonessential: That variable parameter in which a change may he made in the WPS without requalificat ion.
6.4.1.5 welder performance qualification (WPQ):
The written documentation that a welding machine operator has demonstrated the capability to use the WPS to produce a weld joint meeting the requirements of this specification.
6.4.1.6 weldIng procedure specification (WPS):
The written procedure prepared to proved direction for making production welds to the requirements of this specification. ft must include all essenual and nonessential variables for welding of tool joints to drill pipe. A WPS applies to all those welds of which each member has the same specified dimensions and chemistry that are grouped according to a documented procedure which will ensure a predictable response to weld zone heat treatment for a particular grade.
6.4.2 Welding Requirements
The manufacturer shall deveLop and qualify a welding procedure (WPS and PQR) for welding of tool joints to diii! pipe. The WPS shall identify the essential and nonessential variables. The PQR shall include the results of all mechanical tests listed in 6.4.5. All lots shall be welded in accordance with a qualified procedure (WPS and PQR). The rnanufacturer shall qualify welding machine operators to a specific WPQ for each WPS utilized by the operators.
6.4.3 Heat Treatment
6.4.3.1 The weld zone shall be austenitized. cooled below the transformation temperature and tempered at 1.100°F (593°C) minimum. The weld zone shall be heat treated from the OD to the ID and from the weld line to beyond where the flow lines of the tool joint and pipe material change direction as a result of the welding process.
6.4.3.2 Specimens used for destructive testing (i.e., tensile, impact) shall also be used to determine compliance with the requirements of 6.4.3.1.
A longitudinal section sufficient in length to include the entire Heat Affected Zone (HAZ) from heat treatment shall be suitably prepared and etched to determine the location of the HAZ in relation to the weld line and transverse grain flow.
This etched section shall he used to ensure that the tensile specimen (see 6.4.5.2) includes the full HAZ from heat treatmcnt within the gauge length.
6.4.4 Process Controls—Surface Hardness
Each weld zone shall be hardness tested at three places 120 degrees apart, ±15 dcgrees, in the IIAZ from heat treatment, around outsidc surface. The hardness testing method is optional with the manufacturer. The hardness of the weld zone IIAZ from heat treatment shall not exceed 37 HRC.
6.4.5 MechanIcal Testing
Note: See Appendix A Supplementary Requirements.
6.4.5.1 One set of mechanical tests shall be conducted per lot or 400 welds, whichever is less.
6.4.5.2 Weld zone yield strengths shail be determined by tests on cylindrical tensile specimens taken from the location in Figure 7 conforming to the requirements of the latest edition of ASTM A370, 0.2 percent offse method. 0.500 inch diameter specimens are preferred, 0.350 inch and 0.250 inch diameter spccimcns are suitable alternatives for thin sections.
The product of the yield strength of the tensile specimen and the cross-sectional area of the weld zone shall be greater than the product of the specified minimum yield strength of the drill pipe times the cross-sectional area of the drill pipe based on the dimensions specified for the outside and inside diameter in API Specification 5D. The method for calculating the cross-sectional area of the weld zone shall be.