Annex E – Impact tests
The following are CWB commentaries on impact testing to annex E
The new annex E of CSA W47.1-19 limits only the minimum thickness qualified when CVN are required, it is clearly specified not to refer to clause 11.4.2, 11.4.3 and 11.4.4 when only CVN are to be tested. This is an important change from annex E in the previous version of CSA W47.1 where table 13 was limiting the maximum thickness qualified for CVN. You will find below some clarifications.
Qualification thickness range (E.2.3)
Until further notice, we will not consider clause 11.4.2, 11.4.3 and 11.4.4 when reviewing WPDS with CVN. We will review CVN WPDS using exclusively annex E, thus not considering table 13, 14 or 15 of W47.1 to limit the maximum thickness qualified.
The following requirements shall be considered:
- When only a single pass PQT* is used to qualify CVN, the maximum interpass temperature shall be govern by the preheating used during testing (both max qualified preheat and interpass temperatures shall be actual preheat temp + 56oC)
- When PQT is done in 3G, then the maximum heat input qualified is the heat input of the PQT
- When PQT is done in 1G, 2G or 4G, then the maximum heat input qualified is 10% over that of the PQT
- When establishing the qualified heat input, it shall be calculated as per note 1 of table E.2
*: PQT = Procedure Qualification Test
Qualified base metal (E.2.5 b))
Base metal to be used for procedure testing shall be one of the grades listed in clause E.2.5 b). The impact test properties (energy level and test temperature) or the category of the base metal used for the test will qualify base metal with better impact properties, as we have being doing before, it will also qualified base metal with milder conditions, but only when the weld metal and the HAZ are matching those of the milder base metal conditions.
Annex J – Sheet Steel Applications
The following are CWB commentaries on welding procedure acceptance to annex J
The new annex J of CSA W47.1-19 has some gray areas which need to be clarified to be able to review welding procedures to annex J.
Requirements for prequalified joints (J.8.3)
Prequalification applies only for thickness of 3mm or less, except for the thickness of the structural supporting steel part of fillet welds and flare-bevel groove welds where the maximum thickness should be consider prequalified up to 4.6mm (7Ga). For sheet steel of thickness greater than 3mm, the prequalification provisions of W59 shall be followed.
SAW shall be considered as a prequalified process.
GMAW is considered prequalified for all modes of transfer.
Vertical down will be considered prequalified, until further notice we will not consider clause J.8.3.3.
Procedure qualification requirements (J.8.5/J.8.6/J.8.7)
When tested under annex J, the maximum qualified thickness is 3mm.
The supporting member thickness for arc plug weld (fig. J.7) and arc spot weld (fig. J.8 shall be as specified in clause J.6.8.2.
Essential variables (Table J.5)
Until further notice, we will consider only the essential variables found in table J.5.
Partial joint penetration WPDS
As there is no partial joint penetration for square-groove weld in table J.9 and no procedure qualification tests detailed in clause J.8. If a company want to have a WPDS accepted for PJP square-groove weld, the WPDS will have to refer to AWS D9.1 and tested to D9.1. They will have both W47.1 and D9.1 referred on the WPDS.
Annex K – Stainless Steel Materials
The following are CWB commentaries on welding procedure acceptance to annex K
The new annex K of CSA W47.1-19 is unclear on the requirements for the prequalification and qualification of welding procedure data sheets. The following clarifications are required to be able to review welding procedures to annex K.
Requirements for prequalified joints (K.8.3.1)
For thickness equal or greater than 3mm:
In addition to the joint configurations of fig. 10.1 and 10.2 of CSA W59, the requirements of table 5.4 of AWS D1.6-2017 shall be met to consider a welding procedure as prequalified, including the notes below the table, except for the vertical position, only the upward progression shall be considered prequalified. For MCAW process, the column for the GMAW of table 5.4 shall be considered.
In addition to the above, fillet welds shall meet the requirements of clause 5.8 of AWS D1.6-2017 and plug and slot weld shall meet the requirements of the second paragraph of clause 10.1.3.3 of CSA W59 to be considered prequalified.
For thickness less than 3mm:
The prequalified joint configuration of fig. J.9 are to be used for thickness up to 3mm. The requirements of table 5.4 of AWS D1.6-2017 shall be met to consider a welding procedure as prequalified, including the notes below the table, except for the vertical position, only the upward progression shall be considered prequalified. For MCAW process, the column for the GMAW of table 5.4 shall be considered.
Prequalified base metal and matching welding consumables (K.8.3.2)
Table K.1 of CSA W47.1-19 shall not be used. To be considered prequalified, the base metal and matching welding consumables shall be in accordance with the requirements of tables 5.2 and 5.3 of AWS D1.6-2017.
Maximum interpass temperature
The maximum interpass temperature shall not exceed 175oC, as per clause 5.5.2 of AWS D1.6-2017.
Review of incoming WPDS referring to CSA W47.1, Annex K
When a WPDS refer to CSA W47.1-19, it shall:
- Only have CSA W47.1 as the reference standard, if the client/retained engineer insist to also include D1.6 as the reference standard, then all requirements of W47.1 and D1.6 shall be met (prequalification or qualification requirements)
- Have no reference to table K.1, base metal and welding consumable shall be as per table 5.2 and 5.3 of AWS D1.6 by:
- Referring to specific specifications/alloys (i.e.: ASTM A240 type 304L) and corresponding filler metal (i.e.: ER308L)
- Referring to a base metal group of table 5.2 (group B of table 5.2 of D1.6) and corresponding filler metal of table 5.3 (E308LT1-1)
- For base metal, both specification and alloy type shall be specified, not just the alloy type as the same alloy type can fall in different group of table 5.2 (i.e.: ASTM A240 type 304L is in group A while ASTM A511 type 304L is in group B)
- If the thickness range shown on the WPDS includes both sheet metals and thickness greater than 3mm, then both requirement of annex K and annex J shall be met,, if this is not possible with one WPDS, then the WPDS shall be split into two distinct WPDS
Review of incoming WPS referring to CSA W47.1, Annex K
Stainless steel WPS referring to CSA W47.1-19 can include references to AWS D1.6 for everything except the qualification and prequalification of welding procedures other than table 5.2, 5.3 and 5.4.