Effect of buffer layer and notch location on fatigue behavior in welded high-strength low-alloy

Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel

“…Conventional arc welding are the main welding technique applied in industry to join the high strength steels. However, these traditional arc welding procedures have relatively high heat inputs which result in slow cooling rates of the weldment, and this can produce softening in the heat affected zone (HAZ) [10], giving low strength of the weldment [11,12].…”

Microstructure and mechanical properties of laser welded S960 high strength steel

“…The low carbon content and low alloy content of HSLA steels results in a low carbon equivalent value (CEV), which can reduce the preheating temperature or negate the requirement for weld preheating [5]. When compared to laser welding, conventional arc welding processes lead to relatively high heat inputs, resulting in lower cooling rates across the weldments, and this can cause softening in the heat affected zone (HAZ) [6,7], and reduced strength for the weldment as a whole [8,9]. This is a particular issue for higher strength HSLA steels, but one which could be addressed by specific processing involving rapid water cooling.…”

Tensile overload-induced plastic deformation and fatigue behavior in weld-repaired high-strength low-alloy steel

“…Likewise, another reference reported by Zhang et al (2012c) studied the effect of welding residual stress on the fatigue crack growth behavior of the weld-repaired HSLA with and without a BL. The fatigue Paris curve (da/dN vs. K) for each group of the weld-repaired HSLA with and without BL was determined twice with two identical specimens, and the experimental results from the two identical tested samples in each group were quite consistent.…”