Abstract
The crack sensitivity and the strength at high temperature of type 347 Cr-Ni austenitic weld metal with 3.5-8.5% Mn made by Argon-arc or coated metal arc welding, are researched. The ex-perimental results are as follows.(1) Addition of Mn to type 347 weld metal decreases crack sensitivity.(2) In the case of fully austenitic weld metal made by the suitable addition of Mn, Sigma phase can not be formed under high temperature for 1, 000 hours.(3) The creep rupture strength at 650°C of fully austenitic weld metal with suitable additional Mn, is superior to the standard type 347 weld metal.
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