The Effect of Filler Wire and Flux Compositions on the Microstructure and Properties of Microalloyed Steel Weld Metal.
Research and development rept.,
COLORADO SCHOOL OF MINES GOLDEN DEPT OF METALLURGICAL ENGINEERING
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Experimental submerged arc welds were made on quenched and tempered 34-in.-thick C-Mn-Mo-Nb plate using various combinations of filler wires and fluxes. The welds were made under conditions of constant heat input 75 kJin and a constant deposition ratio of wire speed to travel speed of 13. Standard quantitative metallographic techniques were used to evaluate the volume fraction of the weld metal microconstituents, the acicular ferrite lath spacing, and the average prior austenite grain size. Along with hardness values, other weld metal properties were obtained from Charpy V-Notch specimens, Izod specimens, and tensile specimens. Results indicated that a commercial low Si02, high CaF2 flux, combined with a filler wire microalloyed with titanium, boron, and molybdenum, provided the optimal microstructure in terms of weld metal properties.
- Polymer Chemistry