By J.R. Davis
This booklet information the numerous types of weld corrosion and the tools used to reduce weld corrosion. Chapters on particular alloy workforce Carbon and alloy steels, stainless-steel, high-nickel alloys, and nonferrous alloys describe either normal welding features and the metallurgical elements that impact corrosion habit. Corrosion difficulties linked to assorted steel weldments also are examined.
Case histories rfile corrosion difficulties distinctive to express industries together with oil and fuel, chemical processing, pulp and paper, and electrical strength. detailed demanding situations brought on by high-temperature environments are mentioned. universal ways to video display weld corrosion and try tools for review of intergranular, pitting, crevice, stress-corrosion cracking, and different kinds of corrosion also are reviewed.
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Extra resources for Corrosion of Weldments
Cracking was intergranular, as shown in Fig. 8 and 9. The reﬁnery operators immediately embarked on a program of visual inspection of all amine lines. As of June 1985, a total of 35 leaks in lean amine piping had been discovered. All leaks were at cracks in or around pipe-to-elbow welds, except for two leaks at welds that connected a tee and reducer, respectively. ). Service temperature ranged from 40 to 60 °C (100 to 140 °F), with most leaks having occurred in lines carrying lean amine at 55 °C (130 °F).
Mitigation of preferential weld metal corrosion may be achieved in some cases via alloying additions to make the weld metal cathodic to the adjacent base metal. 5%Cr) X52/A333-6 X52/A333-6 X52/A333–6 X52/A333-6 X65 Welding process(a) AWS consumable designation (closest) MMA TIG TIG TIG MMA TIG MMA TIG MMA MMA TIG TIG E7018 ER70S-6 ER70S-6 ER70S-6 E8018-C3 ER80S-Ni1 E8010-G ER80S-G E8010-G E7015–A1 ... 5%Mo ... Alloying element in weld metal% ... ... 32(Mo) ... (a) MMA, manual metal arc; TIG, tungsten inert gas.
The rupture is at the toe of the weld between the 3 in. pipe and the reduction socket (arrow). Fig. 20 The interior of the cross-tee showing the location of Weld Section 1 through the rupture at the toe of the weld joining the 3 in. pipe and the reduction socket. Note the reticulated pattern on the interior surfaces of the cross-tee, suggestive of thermal fatigue. ) based on the minimum allowable wall thickness. ) based on minimum allowable wall thicknesses. Polished and etched cross sections remote from the welds showed that the pipe and forged Fig.