Scatter of Fracture Toughness in HAZ of small Heat Input Welding
1997 Volume 35 Issue 5 Pages 258-263
Details
1997 Volume 35 Issue 5 Pages 258-263
A study was made on scatter of the critical CTOD in HAZ of a SMAW weldment with heat input of 18kJ/cm, in comparison with a SAW weldment with heat input of 50kJ/cm tested in the preceding work. The following features in HAZ toughness of the former weldment were noticeable, in contrast to the latter weldment.
(1) Scatter of the critical CTOD in the HAZ was fairly less.
(2) Pop-ins were found with a little frequency.
(3) The HAZ of the weldment had the good critical CTOD irrespective of poor toughness in the synthetic HAZ for the local brittle zone.
These results are well explained by the small area for the local brittle zone, which was caused by tempering of the next welding pass.
