Submerged Arc Welding Consumables for HSLA (High Strength Low Alloy)-100 Steel.

摘要

The development of a class of high strength, a low alloy steel with strength levels of 690 MPa (100 ksi) has made it necessary to formulate new welding consumables to take advantage of the potential benefits of this steel, HSLA-100. The possible benefits include welding without pre or post heating resulting in improved productivity. Optimizing the consumables for higher heat inputs further improve productivity and reduce construction costs when using this steel. The optimum titanium content for the welds in this investigation was 0.012 wt%, the lowest level in this study. The range over which the titanium content varied was found to have little direct effect on the acicular ferrite fraction in the weld metal. The result indicated that the number of metallic oxide inclusions per unit volume and the inclusion size distribution were controlled by titanium bearing, faceted particles found within the spherical inclusions. Manganese also has little effect on the acicular ferrite fraction, but influenced the formation of martensite and retained austenite islands within the microstructure. (JES)