Welding method and welding device for thermocouple

Abstract

The invention discloses a welding method and welding device for a thermocouple. Two straight thermocouple wires are welded in a butt joint mode. The two straight thermocouple wires to be welded are connected in a direct-current circuit. The butted ends of the two thermocouple wires abut against each other in a coaxial mode, and the other ends of the thermocouple wires are connected with the positive pole and the negative pole of a direct-current power source through the circuit respectively. In the welding process, the direct-current circuit is switched on, and meanwhile pressure is applied to the butted ends of the thermocouple wires, the butted ends of the two thermocouple wires are fused and welded together, and the time that the direct-current circuit is switched on is controlled to be 0.01-1000 ms; after welding cooling is conducted, the thermocouple wires welded into a whole are bent at a weld joint. According to the thermocouple welded through the welding method, a welding spot is shrunk remarkably at the weld joint, temperature detection of the thermocouple can be conducted in the test process more accurately, the temperature detection errors caused by welding spot protrusion of the thermocouple are reduced, and the loss caused during the test in industrial production is avoided.

Description

technical field [0001] The invention belongs to the welding process of thermocouples, and in particular relates to a thermocouple welding method and a welding device. Background technique [0002] Thermocouple testing equipment for slag crystallization performance has been widely used in metallurgical industry experimental research. The key unit of the equipment is the thermocouple. The thermocouple is used as the heating element and temperature measuring element of the equipment. influences. The commonly used thermocouple welding method is very simple. The welding circuit is as follows: figure 1 As shown, tightly bind the positive and negative thermocouple wires, then connect one end to the negative pole of a DC power supply of about 30V, and quickly touch the other end to the graphite electrode connected to the positive pole of the power supply to short circuit the circuit The instantaneous huge arc heat released will melt the tip of the thermocouple, so that the positiv...

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Problems solved by technology

[0003] The thermocouple welded by this traditional method has a larger melting ball in the positive and negative connecting parts, such as figure 2 The tip of the middle thermocouple, the center of the temperature measured in the experiment is the center of the ball, and in the slag crystallization performance experiment, the slag sample is placed at the angle formed by the two thermocouple wires. Therefore, the experiment The measured temperature is not the real temperature of the slag, and the errors caused by this to the experiment have not been paid attention to by scientific researchers for a long time, and the experimental data may bring serious losses to follow-up research or production guidance

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