title: ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð¿ÑÐ¸ÑÐ¸Ð½ ÑÐºÐ²Ð¾Ð·Ð½ÑÑ Ð´ÐµÑÐµÐºÑÐ¾Ð² Ð² ÑÐ²Ð°ÑÐ½ÑÑ ÑÐ·Ð»Ð°Ñ Ð°Ð¿Ð¿Ð°ÑÐ°ÑÐ° Ð½Ð¸Ð·ÐºÐ¾ÑÐµÐ¼Ð¿ÐµÑÐ°ÑÑÑÐ½Ð¾Ð¹ ÑÐµÐ¿Ð°ÑÐ°ÑÐ¸Ð¸ Ð³Ð°Ð·Ð°
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Research of the causes of through defects in welded assemblies of the device for low-temperature gas separation
Creators: name: ÐÐ°Ð¼ÑÐ»Ð¸Ð½, ÐÐ¸ÑÐ¸Ð»Ð»
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: Ð¡Ð²Ð°ÑÐ½ÑÐµ ÑÐ¾ÐµÐ´Ð¸Ð½ÐµÐ½Ð¸Ñ Ð¸ ÑÐ²Ñ
ÐÐ¾ÑÑÐ¾Ð·Ð¸Ñ Ð¼ÐµÑÐ°Ð»Ð»Ð¾Ð²
Ð¡ÑÐ°Ð»Ñ Ð»ÐµÐ³Ð¸ÑÐ¾Ð²Ð°Ð½Ð½Ð°Ñ
Ð¿Ð¸ÑÑÐ¸Ð½Ð³
ÐºÐ¾ÑÑÐ¾Ð·Ð¸Ð¾Ð½Ð½ÑÐµ Ð¸ÑÐ¿ÑÑÐ°Ð½Ð¸Ñ
pitting
corrosion tests

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description: Purpose of the work: determination of the causes of through defects in the heat exchange element of the low-temperature gas separation apparatus. Work tasks: 1. Macroscopic analysis of samples for detecting surface defects of the base metal and zones of welded joints (seam, heat-affected zone) with determining the size of defects and describing the features of their location, structure and formation of deposits. 2. Determination of the chemical composition of samples with the establishment of steel grade in accordance with GOST and / or ASTM. 3. Metallographic studies of samples in the welded joint zone, heat-affected zone, as well as a defective area with an assessment of the structural components and the establishment of the nature of corrosion damage. 4. Determination of the corrosion resistance of various areas of the metal of heat exchange elements (base metal, heat-affected zone) to the identified type of corrosion destruction. In the final qualifying work, the results of studies of metal samples of heat-exchange elements of a low-temperature natural gas separation apparatus are presented in order to determine the causes of through defects. The work contains an analysis of the available literature, the results of visual inspection, chemical analysis, metallographic studies and corrosion tests. As a result of the comprehensive studies of the samples of heat exchange elements, it was found that the main reason for the appearance of through defects is the welding technology, which leads to the activation of the metal in the heat-affected zone, steels without titanium, as a result of which pitting is formed under the influence of a corrosive environment. In the course of the study, it was discovered that the steel 12X18H10T, provided for in the design documentation, was replaced by steel of the 12X18H9 type (without a stabilizer).