Fixing method for sheathed thermocouple

Abstract

The invention relates to a fixing method for a sheathed thermocouple, comprising the following steps of 1) self-checking a welding seam to be qualified after finishing the welding construction of base metal; 2) cutting out a section of welding wire made of a material same as that of the welding seam of the base metal; 3) spot welding one end of the welding wire cut in the step 2) on the surface, of which the temperature is to be measured, of the welding seam, wherein the welding wire used when a welding machine is used for spot welding is made of a material same as that of the cut welding wire; placing the hot end of the sheathed thermocouple on the middle position of the welding wire, and spot welding the other end of the welding wire on the surface of which the temperature is to be measured so as to ensure that the hot end of the thermocouple is pressed by the welding wire; 4) carrying out thermal treatment on the welding wire; and 5) polishing the spot welding part of the welding wire by using a polishing machine after finishing thermal treatment to flatten the surface of the welding seam. By using the method disclosed by the invention, the phenomenon that the material on the surface of the welding seam is nonuniform because the surface of the welding seam can generate a dissimilar material is overcome, and the problem of temperature measurement inaccuracy caused by the infirm contact between the hot end of the thermocouple and the part of which the temperature is to be measured is solved.

Description

technical field [0001] The invention belongs to the field of temperature measurement of post-weld heat treatment in electric power construction, and in particular relates to an armored thermocouple fixing scheme. Background technique [0002] At present, in the construction and production process of electric power construction, the temperature measurement parts of the post-weld heat treatment are generally measured by thermocouples, and 18# thin iron wire is used to bind the hot end of the thermocouple to the surface of the temperature measurement place for temperature measurement. Due to the small diameter of the thin iron wire, the iron wire is bound on the surface of the object to be measured. During high-temperature tempering, it is inconsistent with the expansion coefficient of the weld, causing the temperature measurement point to move or cannot be in close contact with the temperature measurement point. Inaccurate. [0003] The other is to use a simple thermocouple, ...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a method for fixing armored thermocouples, which solves the phenomenon that heterogeneous materials will be produced on the surface of the weld seam, resulting in uneven material on the surface of the weld seam, and solves the problem that the hot end of the thermocouple is in contact with the temperature to be measured. Inadequate contact, resulting in inaccurate temperature measurement

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