Abstract
Past experimental report shows that Slit Test, C.T.S. Test, Maximum Hardness Test of Weld Heat-Affected Zone, Single Bead Bending Test, V-Notched Charpy Impact Test are available to infer the weld crack sensitivity of low alloy high strength steel, except C.T.S. Test.
In order to determine the weldability on this report, above four testing methods are applied for 25 mm thick Ni-Cr-Mo low alloy high strength steel plates which have different hardness with dissimilar heat treat conditions.
Following results is given about low alloy high strength steel by this comparative weldability test.
(1) Cast steel plate shows far inferrior weld crack sensitivity than rolled steel plate.
(2) Original hardness of base steel shows almost no effect for the crack sensitivity of weld heataffected zone.
(3) Slit Test shows excellent effect as the way to determine the weld crack sensitivity.
(4) Maximum Hardness Test of Weld Heat-Affected Zone is effective to infer the weld crack sensitivity to certain extent.
