Expert ForumsCorrosion

Topic: Re: What welding rod materials will resist chloride stress cracking?

posed by 
Beyond specifying that recognized welding procedures be followed, you might consider "over alloying" to ensure that the weld metal and heat affected zones have/maintain the same/similar corrosion resistance as the 316L base metal. When 316L stainless steel is welded, there is a tendency for molybdenum (Mo) to be lost during welding. Since molybdenum content is the main difference between 304L (no molybdenum, less corrosion resistant) and 316L (2-3% molybdenum, more corrosion resistant), any loss of molybdenum will lead to a corrosion characteristic in the weld zone that tends toward 304L. So "over alloying" with a weld wire like 317/317L, that contains 3-4% molybdenum, will ensure that the final weldment has molybdenum content equal to or greater than 316/316L and give the corrosion resistance at least as good as the 316L base metal.