Etching 303 to 430F Weldment, GTAW

[Capntom]

We have autogenously welded these two metals. I want to evaluate the weld interface, penetration and HAZ. My question is what chemical etchants do I use?? I have heard Aqua regia, HNO3 and Alcohol or a mixture of HNO3-HCl and H20? Which one or other would work the best?

 

[EdStainless]

We use HNO3+HCl in water for general stainless macroetching. Roughly 1:1:1, but if you are looking at unannealed autogenous welds you might want it less concentrated, like 1:1:3.

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