SMAW problems?
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Is it necessary to conduct a new welding procedure qualification when changing the submerged arc welding flux from HJ431 to SJ101? I asked a welding professional, and he said it depends on the type of flux; if the flux types are the same, then it can be used for welding procedure qualification. The key is that I can’t provide him with the type of flux. The type of flux is indicated on the flux quality certificate.
These days, manufacturers usually indicate on the warranty certificates whether it is reactive or neutral; HJ431 is generally reactive, while SJ101 is neutral, and re-evaluation is required
The process evaluation still needs to be done again.
It’s being done now. For some reason!
hj431 is a melting-type flux, while sj101 is a sintering-type flux
Melting and sintering have nothing to do with whether it is neutral or not. The SJ101 version is neutral; you can ask the manufacturer to provide this information. These days, it’s required to specify what type of flux is used
One needs to be active and the other neutral
For welding Q245R steel plates using submerged arc welding, can SJ101 be used as the flux?
Take a good look at the standards at http://www.doc88.com/p-1925049441674.html; HJ431 is likely of the manganese-silicon type and belongs to the category of active fluxes. SJ101 is neutral; according to NB/T47014, when performing submerged arc multi-layer welding with Fe-1 grade steel, changing the type of flux (neutral flux or active flux) requires re-evaluation.