Help: What is the definition of “heat treatment range” in welding procedure qualification? ? ?
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6.1.4.2. In...... When an impact test is required, a new welding procedure qualification must be conducted if the holding temperature or holding time range for post-weld heat treatment is changed. What exactly does the scope here refer to? For example, in the evaluation, the heat treatment temperature for Q345R is set at 620±20°C, while that for 15CrMoR is 670±20°C℃ ； When both of these main materials are present in a device, the selected heat treatment temperature is definitely 670±20°C. ? ? ? Please ask an expert to cite the standard or provide an explanation!!!
I believe that for the two materials, Q345R and 15CrMoR, the appropriate heat treatment temperature should be 670±20℃； The heat treatment time shall be the one with the longer holding time.
How to choose for evaluation? Is it necessary to conduct another evaluation for Q345R at 670±20℃? ? ?
This clause includes the subsequent insulation time. It is one of the things that is not well written or incorrect in 47014. . . The veteran comrades who are involved in discussing standards have rigid thinking, slow reactions, and are unable to adapt. . The colleague in charge of drafting the standards still doesn’t understand the meaning behind it. This results in poor handwriting. This range is the one you write down in your welding qualification. XXX±XX As for what to do with your product, I haven’t encountered such a situation before; it’s recommended to consult with the quality inspection department first. Either by supplementary shock treatment or by segmented heat treatment, when the conditions permit.
It’s not enough to just do the impact test again; either redo the whole thing, and that will be quite troublesome! ! There are many different materials on one device – haven’t you encountered that before? It would have been better to define this range clearly earlier!