Brine welding device for precious metal thermocouple and operation method

Abstract

The invention discloses a brine welding device for a precious metal thermocouple and an operation method. The brine welding device comprises a welding container which contains a sodium chloride solution; a lifting mechanism arranged beside the welding container; a welding cross beam arranged on the lifting mechanism and capable of driving the welding cross beam to do lifting motion; a clamping mechanism arranged on the welding cross beam and used for clamping the precious metal thermocouple to be welded; and a power supply circuit comprising a first pole circuit and a second pole circuit, wherein the tail end of the first pole circuit is connected with the precious metal thermocouple to be welded, the tail end of the second pole circuit is connected with a conductive metal sheet, and the conductive metal sheet is located in the sodium chloride solution. The welding device can well solve the problems that welding spots are not firm, bubbles exist in welding, the welding surface is rough and the like due to personal welding level and accidental factors at present, the influence of human factors is effectively reduced, and potential safety hazards are reduced.

Description

technical field [0001] The invention relates to a salt water welding device and an operation method for noble metal thermocouples, belonging to the technical field of noble metal welding. Background technique [0002] Precious metal thermocouple is a temperature-sensing element that measures temperature by measuring the potential value. It is made by welding one end of two different precious metal materials. The unwelded end is called the reference end, and the welded end is called the measuring end. The measuring end is welded The quality directly affects the reliability of thermocouple temperature measurement. [0003] At present, the commonly used welding methods for the measuring end of precious metal thermocouples include carbon rod arc welding and salt water arc welding. The usual welding methods are controlled by human operation to control the length of welding time and the selection of welding positions, the length of welding time, the selection of welding positions ...

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Problems solved by technology

[0003] At present, the commonly used welding methods for the measuring end of precious metal thermocouples include carbon rod arc welding and salt water arc welding. The usual welding methods are controlled by human operation to control the length of welding time and the selection of welding positions, the length of welding time, the selection of welding positions and other factors. Seriously affect the quality of welding, poor mastery will easily lead to low welding success rate, often need to try welding for many times to succeed, after many times of welding, the original moderate length of precious metal thermocouple is getting shorter and shorter, and finally it can not continue to use ; In addition, precious metal thermocouple materials are expensive, and repeated welding causes waste of precious metal thermocouple materials

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