Download Corrosion of Weldments by J.R. Davis PDF

By J.R. Davis

This booklet info the numerous different types of weld corrosion and the tools used to reduce weld corrosion. Chapters on particular alloy staff Carbon and alloy steels, chrome steel, high-nickel alloys, and nonferrous alloys describe either normal welding features and the metallurgical elements that impression corrosion habit. Corrosion difficulties linked to multiple steel weldments also are examined.Case histories rfile corrosion difficulties exact to express industries together with oil and fuel, chemical processing, pulp and paper, and electrical strength. distinctive demanding situations because of high-temperature environments are mentioned. established how to visual display unit weld corrosion and attempt equipment for evaluate of intergranular, pitting, crevice, stress-corrosion cracking, and other kinds of corrosion also are reviewed.

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Pipe, and the reduction fitting could not contain the pressurized gas, resulting in a rupture. While cyclic pressure or thermal stresses may have had some secondary contributory role in the rupture mechanism, there was no evidence of a distinct cracking mechanism other than stress overload as the remaining material at the toe of the weld became too thin to contain the pressurized gas. Reticulated corrosion patterns similar to those observed in this investigation have been observed beneath columnar deposits under service conditions in which thermal fatigue could not have occurred because there was no thermal cycling.

The wastage from the interior surfaces of the cross assembly and piping resulted from corrosion by the H2S gas rather than erosion. This conclusion is supported by two observations. First, the entire interior surface was coated with a relatively thick, multilayered, and somewhat friable columnar iron sulfide corrosion product deposit. If the metal loss were the result of erosive wear, the metal surfaces at the wasted locations would have been devoid of deposits. Second, the micro-morphology of the interior surfaces of the cross assembly is completely inconsistent with erosion.

Oxygen scavenging was ensured by the addition of catalyzed sodium bisulfite (NaHSO3) to the storage tanks. Treated water entered the top of the tray section of the deaerators through five or six spray nozzles and was stored in the horizontal tanks below the deaerators. Inspection Results. Deaerator vessel and storage tank A were inspected. All tray sections were removed from the deaerator. With the exception of the top head-to-shell weld in the deaerator, all internal welds were ground smooth and magnetic particle inspected.

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