Abstract
Among axles produced by forging shops of the Yawata Iron Works in Japan where axles for trains and tram cars are manufactured, defective axles to be rejected owing to the flaw amount to the quantity which corresponds to the production of about one month against the total annual production. Under such circumstances, the author investigated processes which may improve the results with respect to the following items:-
A. Axles rejected from the flaw in the light of statistics.
B. Kinds of flaw
C. States of flaw
D. Causes of flaw and its remedies.
