Somehow, the welding engineer will confuse with which samples will be used in PQR preparation for applying the WPS correctly in accordance with Project specifications. Special on Tubular and Non-Tubular application. There are short guideline may help you to choose the samples wisely as below articles and file: What is CJP in welding in Tubular and Non-Tubular AWS D1.1: WPS variables – Joint design Back gouging in welding WPS/PQR – JOINT DESIGN AWS D1.1 tubular vs non-tubular and PQR preparing guidelines   Continue reading AWS D1.1: Non-Tubular vs Tubular 

AWS D1.1 Table 4.5 Para 34: The omission, but not included, of backing or back gouging Keynotes: You can applied the Backing for making better penetration concept, but it does not mean the applied PQR (PJP) is qualified as WPS (CJP) joint, in case of wrong approved WPS (CJP) with supporting PQR (PJP) !!!! Be careful. Short guideline for inspection of these variables on Non-tubular structure: 1: In the stage of WPS approval and review: If the applied PQR with CJP sample, your WPS will cover all type of joints including CJP & PJP, also do cross-check with the WPS … Continue reading AWS D1.1 Table 4.5 para 34 variable

Refer Doc: AWS D1.1 Table 4.5, welding variables Continue on the explanation of requirement on AWS D1.1 – Joint design variable: AWS D1.1 Table 4.5 Para 32: A change in the type of groove to a square groove and vice versa. Keynotes: PQR mentioned V- groove (CJP) with backing/gouging: In this case, you can change WPS to Square groove applying at site, Square groove (PJP) without backing or with backing/gouging (CJP) depend on Fabrication drawing as designed for that joint (If the drawing stated that is PJP, the PJP should be followed the prequalified PJP, Figure 3.2 for assuring the … Continue reading AWS D1.1 Table 4.5 para 32 variable

Refer Doc: AWS D1.1 Table 4.5, welding variables Continue on the explanation of requirement on AWS D1.1 – Joint design variable: Table 4.5 para 31: A change in groove type (e.g., single-V to double-V), except qualification of any CJP groove weld qualifies for any groove detail conforming with the requirements of 3.12 – PJP, 3.13 – CJP, 9.10, or 9.11. It means that when you make a PQR with CJP sample, your WPS can use for many type (all type) of weld joint type that including both CJP, PJP types as defined in 3.12, 3.13, 9.10, 9.11. What is CJP … Continue reading AWS D1.1 Table 4.5 para 31 variable

AWS D1.1 Table 4.5 para 31: A change in groove type (e.g., single-V to double-V), except qualification of any CJP groove weld qualifies for any groove detail conforming with the requirements of AWS D1.1 para: 3.12 – PJP, 3.13 – CJP, 9.10, or 9.11. See the interpretation: AWS D1.1 Table 4.5 para 31 variable AWS D1.1 Table 4.5 para 32: A change in the type of groove to a square groove and vice versa. See the interpretation: AWS D1.1 Table 4.5 para 32 variable AWS D1.1 Table 4.5 Para 33: A change exceeding the tolerances of 3.12, 3.13, 5.21.4.1, or 9.10, 9.11, … Continue reading AWS D1.1: WPS variables – Joint design

QW-402.11 The addition or deletion of nonmetallic retainers or non-fusing metal retainers. See: Backing vs Retainer in Welding This variable is used so little that makes people have forgotten what it means. It primarily used with the Electroslag welding process. In the case of SMAW process, however, it has the same meaning with backing. Retainers refer to those applications where some non-metallic means is used to keep weld puddle from flowing out of the groove, and in general that it will be in high heat input welding procedure. Remember that the WPS needs not be one piece of paper. During fabrication, … Continue reading ASME IX QW-402.11 variable

QW-402.10 A change in the specified root spacing. Note: The change in the root spacing is frequently addressed by manufactures on separate sheet or by addressing it on fabrication drawing just like joint designs. Root spacing and root gap are used as interchangeable. Do not be confused with these two terms. A root gap from “0 to 50mm (2”)” can be covered by ASME IX, however, a request may be made to have the WPS requalification for the “big” gap if the WPS was not carefully written according to ability of welding technology or welding process to make a sound … Continue reading ASME IX QW-402.10 variable

QW-402.4 The deletion of the backing in single welded groove welds. Double‐welded groove welds are considered welding with backing. Note: From 1980 to 2019, this variable underwent many revisions, to fully understand backing, we need to review the definition of backing in definitions section. Backing: a “material” placed at the root of a weld joint for the purpose of supporting molten weld metal so as to facilitate complete joint penetration. The material may or may not fuse (retainer) into the joint. Backing gas: a gas, such as argon, helium, nitrogen, or reactive gas, which is employed to exclude oxygen from … Continue reading ASME IX QW-402.4 variable