Issues regarding the selection of welding wire for the mechanical seal flushing pipe and the oil transfer pump head cover
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There is a oil transfer pump of type BB3; the mechanical seal flushing pipe is made of 316L material, while the pump’s housing cover is made of cast steel. During operation, due to alternating loads, fatigue cracks appear at the weld between the mechanical seal flushing pipe and the housing cover, resulting in oil leakage. Therefore, welding repairs are necessary, but I would appreciate suggestions on which type of welding wire to use. Thank you.
For electrodes, A302 or A307 or A042, A312, and A307 are all suitable. A general structure A302 will suffice. For CO2 gas shielded welding, either E309LT-1 or E309MoLT-1 wire can be used; for general structures, the former is sufficient.
A302 is a titanium-calcium type welding rod with a 316L shielding tube; the corresponding national standard is 022Cr17Ni12Mo2. Considering factors such as the toughness and plasticity of the welding material, it would be more appropriate to use a low-carbon nickel-based welding wire. Additional info: The machine seal tube specification is 25×2; the pump head cover material is ZG240-450A, with a socket spigot connection.