The paper consists of a short review of the factors controlling the weldability of steel, together with an account of certain work carried out in connexion with the welding of armour type steel. After referring to the basic principles governing the weldability of steel, and describing the influences of alloying additions, the paper discusses the problems peculiar to deep-hardening steels, and summarizes current views on the causes of hardened-zone cracking. A detailed description is given of an improved welding test, and of some of the work carried out with it. The results of this work are then related to the theories already described.
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