Problems with welding stainless steel to carbon steel
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It is generally said that stainless steel and carbon steel cannot be welded together directly, as this leads to electrochemical corrosion which accelerates the corrosion of stainless steel. But by how much does the corrosion rate of stainless steel increase? Will there be any other effects after welding them together directly? I have a question! I hope everyone will share their opinions!
The impact should not be significant; the jacket tubes in our factory are made of carbon steel wrapped with stainless steel, and after being in use for such a long time (ten years), no corrosion or leakage at the connection points has been observed. Just be aware that welding requires a transition welding rod
It’s not that welding isn’t possible; the key is to select the appropriate electrode and welding method in accordance with the welding procedures for dissimilar steels, taking into account the bonding medium.
The joint between the two materials is prone to weld separation when temperatures change.
It’s not that welding isn’t possible; the problem is that welding different types of steel is very complicated
Special treatment is required for the welding surfaces; actually, it’s simpler to use two flanges for connection (provided it’s not a highly toxic or dangerous medium)
Welding is possible, but an extra thick electrode must be used!
They cannot be welded together; since the materials are different, joining them can lead to leaks easily.
Can the use of excessive welding electrodes ensure no leaks in corrosive environments?
Stainless steel electrodes must be used for welding carbon steel and stainless steel
For welding, transition electrodes can be used; A102 electrodes will suffice
Could that hero provide a more detailed explanation?
Electrochemical corrosion may not need to be considered; the key lies in the selection of welding electrodes and the skill level of the welder.
Its welding rods are the most crucial; using special welding rods is no problem.
It should not be possible to weld them together; if welding is necessary, a transition plate can be used. That is, first, a steel plate of the same material is welded onto the stainless steel component as a transition layer, and then the carbon steel component is welded to that transition plate. In many cases, this step is omitted for convenience.
It depends on the medium inside the pipeline; if the medium does not corrode either type of steel, then transition welding electrodes can be used for welding. If there are no suitable welding electrodes, as mentioned by the friend above, installing a flange in between is also a good option.
I’ve heard that stainless steel welding rods should be used.
They can be welded together, but it’s best to consult a specialist in equipment regarding the welding rods~~~~
It can be welded; stainless steel welding rods are required, and it is advisable to conduct a welding procedure qualification.
It can be welded, but only for welding different types of steel. The regulations for metal pipe installation provide specific guidelines, stating that special welding electrodes must be used. It’s just complicated to implement; generally, we try to avoid welding different types of steel together, especially in high-temperature and high-pressure pipelines!
For pressure vessels made from specialized carbon steel and stainless steel electrodes, gaskets of the same material must be used. In terms of corrosion, it’s not really apparent on the surface; the corrosion process is rather slow