Electric butt welding was applied on two of the most widely used steels in the aircraft industry, namely, I-003 and I-202, and was found very suitable for use on steels.
Especially the results obtained on I-202 showed an extreme dependability of the method.
The fact that the tensile strength and elongation of the welded portions were practically the same as the original material for both steels and that the fatigue limit was as high as 85% of that of the original is particularly encouraging in spite of the fact that the impact value fell to approximately 65%.
Besides investigating the properties of the welded portion purely as a welding, an actual application on aircraft parts was carried out with the purpose of investigating the mechanical and metallurgical conditions as they actually exist in practice, satisfactory results were obtained in this case also.
From the standpoint of economy of time and material as well as from dependability this method can be applied to a great advantage in the design of steel parts.
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