A high-temperature welded structural part and a process method for removing stress
A welding structure and high temperature technology, applied in metal processing and other directions, can solve problems such as failure of welded structural parts, failure of expansion joints, etc., and achieve the effect of eliminating internal stress of the weld
Active Publication Date: 2020-08-14
QINHUANGDAO TAIDY FLEX TECH
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Problems solved by technology
In addition, due to the presence of welding stress in the welded structural parts, and cracks occur at the welding stress concentration parts, which will cause the failure of the welded structural parts and lead to the failure of the expansion joint.
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[0030] Aiming at the deficiencies of the prior art, the present invention provides a high-temperature welding structural member and a stress-removing process method, which is suitable for removing the stress of the high-temperature welding structural member at the entrance of an oil refining catalytic cracking smoke machine. The connected welding structural parts are solid solution, pickled and passivated, and then the existing welding stress is removed, so that the expansion joint has the same life as the high-temperature pipeline. A more detailed explanation and description are given below in conjunction with the drawings.
[0031] Such as figure 1 Shows the structural schematic diagram of the welded structure in the expansion joint of the present invention, such as figure 2 Shown is a process flow chart of a process method for removing stress from a high-temperature welded structure. The process method of the present invention involves a welded structure including a first con...
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The invention provides a high-temperature welding structural part and a process method for removing stress. Firstly, feeding, smoothness, flatness and perpendicularity of a first end connecting pipe assembly, a second end connecting pipe assembly and a corrugated pipe which are needed by forming of the high-temperature welding structural part are treated, then the first end connecting pipe assembly and the second end connecting pipe assembly are subjected to penetrant inspection detection, solid solution, rapid cooling and acid pickling and passivating are completed, finally, following weldingis carried out, and the high-temperature welding structural part is obtained. The interiors of weld joints of parts of the welding structural part have no defects through part machining, welding quality control and lossless detection, internal stress of the weld joints of the welding structural part is removed through part solid solution treatment, acid pickling and passivating, and an expansionjoint with the welding structural part and a pipeline have the same service life.
Description
Technical field [0001] The invention relates to the technical field of oil refining catalytic cracking, and is a process method for removing stress from high-temperature welded structural parts at the inlet of an oil refining catalytic cracking smoke machine. Background technique [0002] The working temperature of the high-temperature pipeline medium at the inlet of the FCC flue gas machine for oil refining is 650°C to 750°C. Generally, 304H stainless steel is used for welding structural parts in the pipeline and expansion joints connected to the pipeline, and there is no heat insulation material inside the pipeline. The inner wall of the pipeline is in direct contact, resulting in high ambient temperature of the welded structural parts connected to the pipeline, and the pipeline and welded structural parts work in the high temperature creep temperature range for a long time. In addition, due to the welding stress of the welded structural parts and the cracks in the welding stre...
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IPC IPC(8): B23P25/00
Inventor 齐金祥陈广斌陈四平
Owner QINHUANGDAO TAIDY FLEX TECH