MATERIAL - WELDING ELECTRODES - P+H BA91 (HARNISCHFEGER CORPORATION) WELD STRENGTH AFTER HEAT TREATMENT
GENERAL DYNAMICS SAN DIEGO CA CONVAIR DIV
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Single groove, vee-joint butt welds with a 18 in. root spacing were made in 18-in. thick, annealed 4340 steel using PH BA91 Harnischfeger Corporation welding electrodes for two pass, reverse polarity, DC welding. After welding the weldments were normalized 1600 F, 1-12 hr, air cool, austenitized 1550 F, 1-12 hr, oil quench and double tempered 800 F, 2 hr, air cool, 800 F, 2 hr, air cool. The ultimate strength of the heat treated parent material was 182.0 KS1, and of the welds 170.9 KSI 10 specimens. The weld efficiency thus was 94.
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