Optimization of Grade 100 High-Performance Steel Butt Welds [Tech Brief]
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Optimization of Grade 100 High-Performance Steel Butt Welds [Tech Brief]

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      In the development of the high performance steels (HPS) grades, three advisory groups were formed to oversee and guide the development of the steels in terms of their design, welding, and corrosion aspects. One of the aspects considered by the Welding Advisory Group (WAG) was how to butt splice HPS100W plates together without matching strength consumables. At the time the research began, matching 100-ksi-yield weld consumables were available but were also much more expensive than typical welding consumables for steel bridge fabrication. Therefore, the WAG wanted to demonstrate the use of “optimized” welding as a potentially useful option for the HPS steels under certain circumstances. Optimized welding harnesses triaxial internal constraint, which wider and thicker plates can use to develop through-thickness stresses and demonstrate an apparent increase in yield strength. Therefore, for particular combinations of joint width and thickness, an undermatched weld consumable could develop strengths equivalent to matching consumables. In this case, the “joint” is the butt splice between two different plates. Optimized welding is an attractive option in welds joining HPS plates of differing strength or when weld consumables match the HPS steel in terms of toughness but not in strength. Matching or overmatching welds are not necessary when optimization can be achieved. This TechBrief reports the results from two final tests in this overall research project.
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