... tests and residual stress measurements in a mining boom cluster before and after PWHT Experience with the use of incremental hole drilling technique for residual stresses measurements in the clusters ... destructive testing of welds in metal - Weld joint hardness test, Standards Australia, Sydney, 2003 16 American Society for Testing of Materials, Standard Test Method for determining Residual Stresses ... of pipe butt welds The procedure involved uniformly heating the cluster up to 600°C, holding for a period of hour and cooling back to room temperature Measurements of the movement of the lacing...