Confusion about flux types
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There are neutral fluxes and active fluxes; changing the type of flux requires re-evaluating the welding process. For fluxes of the SJ101 grade (with models such as F5A2-H10Mn2 and F4A2-H08Mn2), the flux type is indicated as neutral in Shanghai Lincoln Company’s material sheet, while it is marked as active in Jinqiao Company’s material sheet. Can fluxes produced under the same standard grade be of different types?
I’m also concerned about this issue and hope that some knowledgeable experts can provide an explanation.
Submerged arc welding is a very commonly used welding method in the welding of pressure vessels. This issue is quite practical, but people usually don’t pay attention to it. I urge colleagues in this field to take a look at the material lists they have at hand, compile a summary, and clarify this issue. It must be a mistake on the part of the welding material manufacturer.
This post was last edited by dipperchen on 2016-2-23 at 10:51. The flux type listed for the SJ101 material in the Lincoln welding materials specification is neutral, while the flux type for SJ101 in the Jinqiao specification is active. However, after communicating with the technical staff of a certain manufacturer, they said that for the SJ101 product they produce as well, if the flux formula is different, it may be neutral or active. What’s your experience in this regard?
Try to listen to the welding material manufacturer’s advice (maybe it’s a mistake). Flux----Model (as specified by standards). Flux----Grade (trade name, designated by the flux manufacturer itself). Although SJ101 is a unified grade, it is not standardized after all.
When naming, the model limits the content of the main components; the composition of the grade varies from factory to factory. According to the formula for calculating the acidity and alkalinity of fluxes, different component contents result in different values for the slag coefficient B, which in turn leads to varying acidity and alkalinity levels of the slag
Yes, such a situation is possible; therefore, the standard requires that the type of flux must be specified on the warranty certificate.