How to weld 304 and A3?
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The oxygen pipelines used in our company are made of 304 material within the workshop area, while the oxygen pipelines supplied by the branch company are made of A3 material. Because of chemical cleaning and cutting, should different-type steel electrodes be used for pipeline welding? What are the specific national standards? Is it still the safer approach to use flange connections?
Welding can be carried out using A302 or A307 electrodes.
Welding with dissimilar steel electrodes is sufficient; non-destructive testing of the welds is required, for details see
It’s what’s known as an excess welding rod; when welding carbon steel and stainless steel, an excess welding rod is required: handshake