On-site detection method for repair welding area of outer surface of high-temperature high-pressure pipe fitting
A high-temperature, high-pressure, on-site detection technology, applied in the direction of measuring devices, testing material hardness, instruments, etc., can solve problems such as the inability to determine the repair welding area, and achieve the effect of eliminating potential safety hazards
Pending Publication Date: 2021-01-01
XIAN THERMAL POWER RES INST CO LTD +1
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Problems solved by technology
The existing metallographic sampling inspection method can only find whether there is a weld on the outer surface of the pipe fitting, and cannot determine the repair welding area
Method used
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[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0021] The present invention provides an on-site detection method for the repair welding area on the outer surface of a high-temperature and high-pressure pipe fitting, comprising the following steps:
[0022] 1) Use a grinder to remove the oxide skin on the outer surface of the high-temperature and high-pressure pipe fittings to reveal the metallic luster;
[0023] 2) Divide the outer surface of the pipe fitting into an equidistant cross grid with a spacing of 100 mm, and use a portable hardness tester to perform a surface hardness test on each node to determine the measurement points with high hardness, such as figure 1 shown;
[0024] 3) In the area of abnormal hardness measurement points, it is further subdivided into grids with a spacing of 5mm, and the boundary between abnormal hardness and normal hardness is found with a portable hardness test...
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The invention discloses an on-site detection method for the repair welding area of the outer surface of a high-temperature and high-pressure pipe fitting. The method comprises the following steps: cleaning oxide skin on the outer surface of a high-temperature and high-pressure pipe fitting by using a grinding machine to expose metallic luster; preliminarily dividing the outer surface of the pipe fitting into 50-200mm equidistant cross grids, performing a surface hardness test on each node by using a portable hardometer, and observing whether an abnormal measuring point with higher or lower hardness exists or not; if the surface hardness abnormal measuring point exists, further subdividing the grid at the connecting line of the surface hardness abnormal measuring point and the normal measuring point closest to the surface hardness abnormal measuring point, and finding out the boundary between the hardness abnormality and the normal hardness by using a portable hardometer; carrying out field metallographic examination on no less than 2 measuring points of each boundary at the boundary part with abnormal hardness, and further determining whether a weld joint, a fusion line and a heataffected zone structure exist at the part or not; and defining the area enveloped by the boundaries of the weld joint, the fusion line and the heat affected zone structure as the repair welding area.
Description
technical field [0001] The invention belongs to the technical field of metal material detection in thermal power plants, and in particular relates to an on-site detection method for the repair welding area on the outer surface of high-temperature and high-pressure pipe fittings. Background technique [0002] High-temperature and high-pressure pipe fittings for thermal power units mainly include tees, elbows, elbows, and large and small ends. They have been in high-temperature and high-pressure service for a long time. Once the pipe fittings fail, it will cause serious equipment damage and threaten personal safety. In the metal inspection during the maintenance of the unit, it was constantly encountered that the metallographic sampling inspection of the outer surface of the pipe fittings was a weld seam, that is, repair welding was carried out in order to remove the defects on the outer surface during the manufacture of the pipe fittings. [0003] GB / T 13401-2017 "Technical S...
Claims
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IPC IPC(8): G01N33/2045G01N3/40
CPCG01N33/2045G01N3/40G01N2203/0274
Inventor 史志刚梅宝杨立勇张磊张宝柱何晓东李启国巴特尔
Owner XIAN THERMAL POWER RES INST CO LTD