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Reg. 96
MATERIALS OF CONSTRUCTION

COVERED ELECTRODES FOR METAL ARC WELDING OF MILD STEEL

Requirements for Deep Penetration Butt-Welding Electrodes

Initial Test.- For electrodes recommended for deep penetration butt-welding, the following initial tests shall be carried out:-

(1) Transverse Tensile Test.- Three transverse tensile test specimens, one each from test pieces shall be prepared according to Table 3 in Appendix H-2 and tested as specified in Appendix H-2. If the diameter of the largest size of electrode manufactured is less than ¼ inch only two specimens need be prepared. The ultimate tensile stress of each specimen shall be not less than 28 tons per square inch.

(2) Transverse bend Test.- Six bend test specimens, two each from test pieces, prepared according to the Table 3 in Appendix H-2 shall be tested in accordance with the method specified in Appendix H-2. If the diameter of the largest size of the electrode manufactured be less than ¼ inch, only 4 specimens will be required. Of each pair of specimens, one shall be tested with the side first welded in tension and one with the other side in tension. The electrode shall be deemed to be satisfactory if on completion of the test no crack or defect at the outer surface of the specimen is greater than 1/8 inch measured across it or 1/16 inch measured along its length. Premature failure at corners shall not be considered cause for rejection.

(3) Butt-Weld Penetration Test.- Examination of the inner edges of the outer discards from the butt-weld test pieces prepared as specified in Appendix H-2 shall show that complete penetration has been achieved.

 
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