Impact Test

Testing Range:

Full penetration butt joint.

Test specimens and testing for impact tests shall be in accordance with this standard GB/T2650.

For weld metal, test specimen type VWT and for HAZ specimen type VHT shall be used. 

Specimens with Charpy V-notch shall be used and sampled from a maximum of 2mm below the surface of the parent metal and transverse to the weld.From each specified location, each set shall be comprised of three specimens.

In the HAZ the notch shall be at 1mm to 2mm from the fusion line and in the weld metal the notch shall be at the weld centerline.

For the thickness > 50mm, two additional sets of specimens shall be taken, one from the weld metal and one from the HAZ at the mid thickness or in the root area of the weld.

The absorbed energy shall be in accordance with the appropriate parent material standard unless modified by the application standard. The average value of three specimens shall meet the specified requirements. For each notch location one individual value may be below the minimum average value specified, provided that it is not less than 70% of the value.

For dissimilar metal joints impact tests shall be carried out on specimens from each HAZ in each parent metal.

Where multiple welding processes are qualified in a single test piece, impact test specimens shall be taken from the weld metal and HAZ that include each process.