On the pressure resistance issue of dissimilar welding between stainless steel and carbon steel
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In the chemical industry, it is common to weld stainless steel fittings such as those made of 304 material onto carbon steel pipes used in processes. What pressure rating do the welds resulting from such welding typically have?
As long as the welding rod is used correctly, it’s just as resistant to pressure as the pipe itself!
Hello, for example, my pipeline currently has a capacity of 25 kilograms and operates at 310 degrees under normal conditions. When installing and welding it, the appropriate welding rod should be used; in fact, it is subject to the same compressive forces as a standard industrial pipeline, right?
Yes, with this pressure, use TIG welding and 309 wire! Regarding welding, you can also seek advice from niat8888 on the forum; he is an expert in this field! @niat8888
This post was last edited by flute6 on 2015-10-23 at 23:18. It is best not to weld different types of steel together, as welding them can cause carburization and damage the stainless steel material. Even if you use special welding rods for welding, the supervisor won’t let you off, because it’s a matter of common sense. Flange connection is the best option. Add a carbon steel flange and a 304 stainless steel flange.
Hello, for example, the pressure tapping pipes of instruments and the nozzles of thermometers – the material specified in the installation manuals is 304 stainless steel. In this case, isn’t there a situation of welding different types of materials together in the process pipelines?
For the welding of carbon steel and austenitic stainless steel, this is something that is extremely common. . . Universal welding rod A302, welding wire ER309. . . . If something goes wrong, it’s your welding skill. It’s not a problem with this welding theory. As for how much pressure it can withstand, it can definitely reach a level similar to that of the base material. . .
This situation is quite common in such systems; as long as the welding quality is good, the key point is that there are specific requirements for the welding materials needed for different base metals.
So, does temperature have an impact on the weld? For example, in the case of carbon steel pipes used in industrial processes, with a pressure of 50 kilograms and a temperature of 300 degrees, if 304 stainless steel fittings are welded to these pipes, will the weld be able to withstand both pressure and temperature without issues? Thank you, teacher, for your guidance!
Above a certain temperature (550°C? Probably), nickel-based electrodes are recommended.