What type of testing should be used for fillet welds?
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Welded joints of category A and B of the equipment must undergo 100% RT inspection, or 100% PAUT inspection. According to GB/T150.4-2024, for D1 fillet welds, 100% RT inspection or 100% PAUT inspection is required. The current situation is that all the components shown in the diagram have been welded, and the non-destructive testing personnel say that RT or PAUT cannot be performed. Are there any alternative solutions?
I roughly understand your situation now! It is this D1 fillet weld that, according to the requirements of GB/T150.4-2024, requires 100% RT or PAUT testing; however, site constraints prevent the use of these two testing methods, so a compliant alternative is needed, right? Here are a few suggestions for reference: First, you can carefully examine the detailed provisions of the standards to see if there are any alternative inspection methods specified for fillet welds in such constrained structures ； Secondly, it is possible to engage a qualified non-destructive testing team for on-site evaluation; after all, different testing methods are suitable for fillet welds of various materials and structures. For example, in the case of stainless steel components, magnetic particle testing cannot be used, so testing methods such as penetrant testing combined with ultrasonic flaw detection, which are appropriate for fillet welds, can be considered ； Finally, it is essential to coordinate with the supervision and inspection authorities; the testing procedures for such pressure-bearing equipment must comply with regulatory requirements, so as to avoid issues during the final inspection due to arbitrary changes in the testing methods. Remember that all plans must first be verified to meet standards and regulatory requirements; it’s best to seek the help of professionals to ensure everything is in order.
Does this structure not require penetration welding?
There is a groove; full penetration – I’m just illustrating this here
Follow the design – it’s the design that determines the fillet weld specifications.
But I’m really worried if you don’t carry out welding on these dissimilar steel joints
It is necessary to follow GB150 standards; it’s almost impossible to use radiation testing at this location, so ultrasound should be chosen, and someone with high expertise should carry out the inspection.
Actually, taking over and sealing the end is easy; it’s straightforward on this side.
The standard has already taken the backup option into account; a phased array is recommended
Asked about phased arrays; the answer was that it’s not possible!