Is it required to do pickling and passivation on welding on Stainless Steel?

Yes, pickling and passivation are often recommended after welding stainless steel to restore its protective chromium oxide layer and remove any contaminants, such as weld scale or oxides. This process helps prevent corrosion and enhances the material's overall durability. While not always legally required, it is considered best practice in many industries, especially in environments prone to corrosion.