Mismatch effect on fatigue crack propagation limit curves of GMAW joints made of S960QL and S960TM type base materials

Welded structures cannot be produced without imperfections, cracks or crack like defects. Among the structural steels, 960 MPa strength category represents a reliable application possibility. Consumables are also available, but the behaviour of mismatch types under cyclic loading condition is not yet clear. In order to know the fatigue crack propagation resistance of 960 MPa strength category steels and their gas metal arc welded joints fatigue crack growth tests were performed. The tests results were analysed and fatigue crack propagation limit curves were determined.

Research of the Causes of the Defect "Sliver" on the Inner Surface of the Steel Pipe Strength Category Х70

A metallurgical examination of surface defects of pipes made of steel of strength category X70 was carried out. The characteristic microstructural features of defects were determined. The causes of the formation of surface defects of the pipe were established. Comparison of the actual and calculated compositions of the detected satellite inclusions was conducted.

ЕЛЕКТРОХІМІЧНІ ТА КОРОЗІЙНО-МЕХАНІЧНІ ВЛАСТИВОСТІ ТРУБНОЇ СТАЛІ РІЗНОЇ КАТЕГОРІЇ МІЦНОСТІ В МОДЕЛЬНОМУ ГРУНТОВОМУ ЕЛЕКТРОЛІТІ

Determine the influence of the strength category of the pipe steel on the electrochemical and corrosion-mechanical properties under the conditions of the combined effect of constant deformation and protective potential in a weakly alkaline environment. The standard methods were used: the massometry method, the potentiometry, the polarization curves, the method for investigating the resistance to corrosion cracking under constant deformation at the cathode potential.

Eastern North Pacific Hurricane Season of 2011

Overall activity during the 2011 eastern North Pacific hurricane season was near average. Of the 11 tropical storms that formed, 10 became hurricanes and 6 reached major hurricane strength (category 3 or stronger on the Saffir–Simpson hurricane wind scale). For comparison, the 1981–2010 averages are about 15 tropical storms, 8 hurricanes, and 4 major hurricanes. Interestingly, although the number of named storms was below average, the numbers of hurricanes and major hurricanes were above average. The 2011 season had the most hurricanes since 2006 and the most major hurricanes since 1998. Two hurricanes affected the southwestern coast of Mexico (Beatriz as a category 1 hurricane and Jova as a category 2 hurricane), and the season’s tropical cyclones caused about 49 deaths. On average, the National Hurricane Center track forecasts in the eastern North Pacific for 2011 were very skillful.