. Official proceedings . ived at. Sample A-14 was given 6,000,000 passes at cantilever loading and6,000,000 passes at simple beam loading; yet, at a total of 12,000,000passes of the 65,000 lb. wheel load, there was no sign of incipient fail-ure, so the test was abandoned. Many other samples, among them A-15,were also subjected to the same treatment and tests, and came throughwith no signs of incipient cracks. Thus, Sperry Research arrived at a standard production procedure,d) Tensile and Hardness Test (Shde 5) This chart shows the comparison, in terms of tensile strength andhardness, of the we
. Official proceedings . ived at. Sample A-14 was given 6,000,000 passes at cantilever loading and6,000,000 passes at simple beam loading; yet, at a total of 12,000,000passes of the 65,000 lb. wheel load, there was no sign of incipient fail-ure, so the test was abandoned. Many other samples, among them A-15,were also subjected to the same treatment and tests, and came throughwith no signs of incipient cracks. Thus, Sperry Research arrived at a standard production procedure,d) Tensile and Hardness Test (Shde 5) This chart shows the comparison, in terms of tensile strength andhardness, of the weld metal with the parent metal in flash butt weldedrail sections. Results of tension tests have varied considerably due tothe difficulty of testing specimens taken from the weld area. However,results indicate that the strength of the weld is very close to that ofunwelded rail metal. Hardness increases slightly in the heat affected zone in the headof the rail. This zone extends about j-inch on either side of the 38 e) Drop Test Samples (Slides 8 and 9) 1) Slide 8—Drop Tests made under supervision of the Robert Company, at the Steelton plant of the Bethlehem Steel for this rail: 1 drop, 2,000 lb. tup, from height of 22 feet. With the results of the research outlined above, we were able todeteiniine a standard procedure for making a weld giving the best com-bination of physical properties. Some of these tests were carried outbefore we had our machine completed in order to aid in the design ofthe equipment. After the machine was completed, further tests wereconducted to perfect the procedure. When we finally arrived at a stand-ard procedure the opration of the equipment was made automatic inorder to eliminate the human element in welding and to enable us toproduce welds of uniform high quality. Naturally, we had our griefsduring this development period, as is normal in developing any spe-cialized machine, but, these were eventually overcome and
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