Sub-zero Welding Process (Report I) : Welding by Utilizing Martensitic Transformation

概要

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A new welding process has been developed to prevent cracking in a weld metal of high strength steels. In the new welding process, an austenitic steel is used as electrode wires in order to weld at higher speed. After welding, proof stress of the austenitic weld metal is improved by refrigeration (sub-zero treatment) and aging. As a result of sub-zero welding of the high strength steel, HT-80 steel, the mechanical properties of the weld metal refrigerated at -72℃ and aged at 450℃ were as follows ; 0.2% proof stress, 100 kg/mm^2 tensile strength, 126 kg/mm^2 tensile strength, 126 kg/mm^2 elongation, (-80℃) 15% Charpy impact value 2.4 kg-m/cm^2
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