When welding stainless steel pipes, the welds need some treatment (e.g. ball blasting and pickling). Is there anything equivalent for carbon steel (not stainless)? I'm looking at a tender document where someone specified pickling etc. for C-steel and I'm wondering wether someone copy-pasted from the specifications for stainless steels.
Other than inspection/NDE , the only treatment would be for appearance. For stick , you need to knock off the slag to examine it for quality. In some situations the hardness would be a concern and minor grinding for hardness tests would be needed. Stainless is the same; clean for inspection/NDE, anything else like glas bead blasting and pickling is for cosmetics. Let me add, if you have a non-engineer manager who just paid millions $ for a piece of stainless equipment , you don't want to see it arrive with gold,blue and black surfaces along the welds. So most vendors will clean-up the welds to avoid some unhappy customer phone calls.
agree with blacksmith37. Here are the materials science issues.
the welding properties of low carbon steel from the standpoint of its time-temperature-transformation curves are well-enough understood by now that the quality of a weld in it can be determined by visual inspection and by swatting it with a 5-pound hammer. if it has the wrong color or flies apart, it's no good, and you go have a chat with the welder or the supplier of the steel.