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Saturday, March 14, 2020

Etching Test in welder qualification

Etching test -

ETCHING TEST is used to find the soundness of the weld and also, it makes the boundary between the base metal and weld metal clearly visible.


Etching Test in welder qualification

Test procedure-
Cut the test piece with the help of power saw from the welded joint (complete transverse section of the weld). 



Grind the cut face and then polish it with a 00-grade abrasive cloth. Now apply the etching solution on the prepared surface.

Etching solution preparation-

use 10% Nitric Acid (HNO3) and 90% Methanol(CH3OH) for etching, clean the surface with water for better appearance of weld boundary.
see below picture-
Etching solution preparation

Etching solution preparation

Etching solution preparation

summary video




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