. Official proceedings . eetweld. which gave a tensile strength ofwell over 70,000 pounds per square inch. The lower showsan all weld metal specimen made with the bare or lightlycoated type of electrode, which broke at 49,000 pounds persquare inch. This same type of specimen is used as a meas-ure of the ductility of weld metal. It will be noted that thereis? a decided necking in the case of the Fleetweld or shieldedarc type of specimen which is absent in the lower inches are measured off in the specimen and carefullymarked, the specimiens are then pulled and the elongationmeasured
. Official proceedings . eetweld. which gave a tensile strength ofwell over 70,000 pounds per square inch. The lower showsan all weld metal specimen made with the bare or lightlycoated type of electrode, which broke at 49,000 pounds persquare inch. This same type of specimen is used as a meas-ure of the ductility of weld metal. It will be noted that thereis? a decided necking in the case of the Fleetweld or shieldedarc type of specimen which is absent in the lower inches are measured off in the specimen and carefullymarked, the specimiens are then pulled and the elongationmeasured. In^ the case of the shielded arc specimen this willrange from 20 to 30r, and in some cases higher, particularlyif the weld is stress relieved or annealed. In the case of thebare or lightly coated electrode, the elongation will be from5 to 109f. This sHde shows graphically the difference in ductilitybetween the welds made with the shielded arc—such electrodeas Pleetweld, and the welds made with the bare or lightly 138. SLIDE No. 3 coated rod. These specimens were made by butt weldingheavy plate and the plate was then bent using the weld as afulcrum point. Note that the specimen on the left, made withthe shielded arc. was bent to 180 degrees without any illeffect on the weld, even though the outside fibres were elon-gated 4:7^c. Note also that the specimen on the left shows
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