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.

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-

summary video