Thermocouple measuring end of the three methods of welding

In the installation of the thermocouple must be used when the welding, welding methods are many, each method is a certain pros and cons, so in the choice of time or according to their own needs, to choose. The next step is to introduce several welding methods, you can understand the main features of the intersection of hot spots.

Cross point welding hot spots: ① hot spot pollution.

In the welding machine under the action of high-intensity electric field, 3 ~ 5s time will be platinum and rhodium thermocouple platinum and rhodium wire positive and negative end of the self-welding together. Because there is no need to add any material medium, the whole process of operation to avoid the occasional silk and solder joint pollution phenomenon.

② solder joint uniform, accurate, high efficiency.

Platinum and rhodium thermocouple platinum and rhodium wire welding when the positive and negative electrode was cross-shaped, the solder joint is only two wire diameter superimposed part, even the same thickness of the wire, each solder joint size are the same, to achieve a uniform size of the hot requirements. After welding, the positive and negative wire will be unfolded, the solder joint will be aligned with the center mark line, and the length of the cut wire will be cut immediately on the special cutting device. The full length error is only 0.1mm. Measured with a week of experience in the operation of workers, per hour can be processed platinum and rhodium fiber 350 ~ 540 pairs.

③ to save platinum and rhodium 10% to 15%, arc welding platinum and rhodium wire, each pair of positive and negative even wire need to burn heat 3 5mm, used to form a spherical solder joint, if do 27mm even silk, need to cut Wire (platinum wire and platinum and rhodium wire) each 30 ~ 32mm. Cross point welding, the solder joints outside the excess part of only 0.3 ~ 0.5mm, do 27mm even silk, just 27.3 ~ 27.5mm material. Comparison of the two processes, the use of cross-spot welding than arc welding per pair of silk to save 2.7 ~ 4.5mm

The above is the main feature of the intersection of hot spots and the main features, which is to ensure the use of thermocouple is an important point, the standard thermocouple is the national standard provides its thermoelectric power and temperature relationship, allow the error, and a unified standard Indexing thermocouple, it has its supporting display instrument available. Non-standardized thermocouples in the use of the scope or magnitude are less than the standardization of thermocouple, generally there is no uniform index table, mainly for some special occasions, the measurement. The thermocouple can not be installed in the area where the measured medium is rarely flowing. When measuring the temperature of the tube with a thermocouple, the thermocouple must be installed against the flow direction and fully in contact with the gas.