Abstract
As it was difficult to improve the impact value of weld metal to as high value as that of low nickel alloy steel base metal by addition of various elements, other improvements of the notch toughness of weld metal were experimentally examined by some heat treatments and by welding of low nickel alloy steel with austenitic electrode wires.(1) The more the fine grained structure increased in a low nickel alloy steel weld metal by multipass welding, the higher its impact value became.(2) The impact value of an as-welded metal of low nickel alloy steel was considerably improved by a heat treatment of normalizing from 900°C.(3) A post-weld low temperature annealing below A1 point lowered the impact value of 2 1/2% nickel steel weld metal. This is attributed to granularization of boundary cementite.(4) If low nickel alloy steel is to be welded by austenitic electrode wire to secure notch toughness of weld metal comparable to that of the base metal, the composition of the electrode wire must be so selected as to give a completely austenitic structure in weld metal, considering the dilution of base metal.
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