Can the welding structure 45 # steel replace Q235?
The key is to see where you're using and if it doesn't matter, you can. 45 # strength, toughness not yield not strong, malleability is not good welding performance general! If it doesn't involve these requirements, you can do it!
Can't. Although the strength of steel is higher than Q235, the welding performance is poor due to high carbon content. Do it by design
45 # is high quality carbon structural steel, which is of medium carbon steel and good mechanical properties. Q235 is a carbon structure steel, which is a low carbon steel, which is not as good as 45 #, but is welded and plastic. It's ok if you select materials according to strength.
