Can the welding procedure qualification for Q345R cover Q345R (R-HIC)?
Thread Content
Question: Can the welding procedure qualification for Q345R cover Q345R (R-HIC)?
It’s not possible, right? The wet hydrogen sulfide environment requires post-weld heat treatment; the welding process may also have special requirements. More importantly, the test specimens need to undergo SSCC and HIC testing.
Yes, but if post-weld heat treatment is required, it cannot be applied. If there are other requirements, a welding test plate can be welded on behalf of it during the welding process.
It cannot be overlapped; evaluation specimens with additional conditions are required
It cannot be overlapped; evaluation specimens with additional conditions are required
At present, the assessment for weld joints is based solely on mechanical properties to establish evaluation rules; the scope covered by these existing rules pertains only to the consistency of mechanical properties and does not include other performance aspects； Therefore, if other performance criteria are introduced as evaluation objectives, the key factors and coverage ranges previously determined based on mechanical properties become invalid, and new coverage rules and ranges must be established according to the newly introduced performance criteria. To determine whether a discussion can cover the topic, one first needs to consider what the purpose of the assessment is
It cannot be overlapped; the operating conditions are different, which leads to varying requirements. This results in different demands regarding the microstructural morphology and the distribution of stress fields, and thus an additional heat treatment step is required in the manufacturing process!
Same request – can’t they be covered since they belong to the same category and group? Can we use hydrogen sulfide-resistant electrodes, with additional evaluation if necessary?