Is there a ASTM method for estimating grain size in welds?
Is there a ASTM method for estimating grain size in welds?
(OP)
I know this is a dumb question, but I was asked to provide a grain size of the weld material (not the base metal or heat affected zone). Since the weld material is very irregular can one truly provide a grain size of the weld?
Thanks in advance for any help. I know I didn't provide alot of details on the weld itself, it's mainly because I don't have much info on it. But it is weld filler material and the microstructure is very irregular. Not sure I can even provide a true grain estimate, but maybe some size information.
Thanks in advance for any help. I know I didn't provide alot of details on the weld itself, it's mainly because I don't have much info on it. But it is weld filler material and the microstructure is very irregular. Not sure I can even provide a true grain estimate, but maybe some size information.





RE: Is there a ASTM method for estimating grain size in welds?
From the publications I have seen, the ASTM method E112 (intercept or other) for determination of grain size can be applied to wrought or cast product forms. Welds would be considered a cast product form.
RE: Is there a ASTM method for estimating grain size in welds?
RE: Is there a ASTM method for estimating grain size in welds?
Yes, I have never seen welds have a grain size identified for components we purchase. On the other hand, I don't see why you couldn't attempt to determine an average grain size using the intercept method where you would have a columnar grain structure instead of all dendrites.
As a side note, I did see a technical paper where the weld grain size was determined using the intercept method, which caught my attention. It must have been an academic exercise.
RE: Is there a ASTM method for estimating grain size in welds?
I'll let you know if we give it a try. I would use my image analysis software and an intercept method.
RE: Is there a ASTM method for estimating grain size in welds?
FYI, there are a number of ASTM methods that discuss grain size including the following:
ASTM E 1382 Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis
ASTM E 930 Standard Test Methods for Estimating the Largest Grain Observed in Metallographic Section (ALA Grain Size)
ASTM E 1269 Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures
You may want to consider more than just an intercept technique, for the reasons already stated.
RE: Is there a ASTM method for estimating grain size in welds?
Thanks and regards
Sayee Prasad R
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