what differ us in issuing a WPQT is we follow for example this is an excerpt form ASME-IX Welder Performance Qualification 2013 a credible WPQT should as Follow Intent of Tests. The performance qualification tests are intended to determine the ability of welders and welding operators to make sound welds. QW-301.2 Qualification Tests. Each organization shall qualify each welder or welding operator for each welding process to be used in production welding. The performance qualification test shall be welded in accordance with qualified Welding Procedure Specifications (WPS), or Standard Welding Procedure Specifications (SWPS) listed in Mandatory Appendix E, except that when performance qualification is done in accordance with a WPS or SWPS that requires a preheat or postweld heat treatment, these may be omitted. Changes beyond which requalification is required are given in QW-350 for welders and in QW-360 for welding operators. Allowable visual, mechanical, and radiographic examination requirements are described in QW-304 and QW-305. Retests and renewal of qualification are given in QW-320. The welder or welding operator who prepares the WPS qualification test coupons meeting the requirements of QW-200 is also qualified within the limits of the performance qualifications, listed in QW-304 for welders and in QW-305 for welding operators. He is qualified only within the limits for positions specified in QW-303.TYPE OF TEST REQUIRED QW-302.1 Mechanical Tests. Except as may be specified for special processes (QW-380), the type and number of test specimens required for mechanical testing shall be in accordance with QW-452. Groove weld test specimens shall be removed in a manner similar to that shown in Figures QW-463.2(a) through QW-463.2(g). Fillet weld test specimens shall be removed in a manner similar to that shown in Figures QW-462.4(a) through QW-462.4(d) and Figure QW-463.2(h). All mechanical tests shall meet the requirements prescribed in QW-160 or QW-180, as applicable. QW-302.2 Volumetric NDE. When the welder or welding operator is qualified by volumetric NDE, as permitted in QW-304 for welders and QW-305 for welding operators, the minimum length of coupon(s) to be examined shall be 6 in. (150 mm) and shall include the entire weld circumference for pipe(s), except that for small diameter pipe, multiple coupons of the same diameter pipe may be required, but the number need not exceed four consecutively made test coupons. The examination technique and acceptance criteria shall be in accordance with QW-191. QW-302.3 Test Coupons in Pipe. For test coupons made on pipe in position 1G or 2G of Figure QW-461.4, two specimens shall be removed as shown for bend specimens in Figure QW-463.2(d) or Figure QW-463.2(e), omitting the specimens in the upper‐right and lower‐left quadrants, and replacing the root‐bend specimen in the upper‐left quadrant of Figure QW-463.2(d) with a facebend specimen. For test coupons made on pipe in position 5G or 6G of Figure QW-461.4, specimens shall be removed in accordance with Figure QW-463.2(d) or Figure QW-463.2(e) and all four specimens shall pass the test. For test coupons made in both positions 2G and 5G on a single pipe test coupon, specimens shall be removed in accordance with Figure QW-463.2(f) or FigureExcept for the special requirements of QW-380, each welder who welds under the rules of the Code shall have passed the mechanical and visual examinations prescribed in QW-302.1 and QW-302.4 respectively. Alternatively, welders may be qualified by volumetric NDE per QW-191 When making a groove weld using SMAW, SAW, GTAW, PAW, and GMAW (except short‐circuiting mode for radiographic examination) or a combination of these processes, except for P‐No. 21 through P‐No. 26, P‐No. 51 through P‐No. 53, and P‐No. 61 through P‐No. 62 metals. Welders making groove welds in P‐No. 21 through P‐No. 26 and P‐No. 51 through P‐No. 53 metals with the GTAW process may also be qualified by volumetric NDE per QW-191. The Volumetric NDE shall be in accordance with QW-302.2. so ayan po kaya medyo mahal daw for us this is a freebies.
Posted on: Sat, 11 Oct 2014 09:45:24 +0000
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