The welding method on k type thermocouple measurements

With the rapid development of industry, K type thermocouple armoured thermocouple is becoming more and more widely in use in production, the thermocouple has become the industry one of the most commonly used temperature detecting element, it has high measurement precision, wide measurement range, simple structure, convenient use, etc. We know through various channels and analysis products, for the majority of netizens to present various industry knowledge.

platinum-rhodium thermocouple measuring side ( Hot) Directly influences the processing quality of platinum-rhodium thermocouple temperature measurement precision, measurement rate and the product cost. In recent years, along with the rapid development of metallurgical technology, the molten steel temperature measuring accuracy and stability of the demand is higher and higher, especially after double platinum rhodium wire increases, the importance of hot point of processing of platinum-rhodium thermocouple is more prominent, how to further improve quality, reduce cost, to seek higher efficiency of welding hot processing way, has become a platinum rhodium thermocouple production enterprise big problem presses for solution. Across the country platinum-rhodium thermocouple production enterprises, the existing platinum-rhodium thermocouple hot processing methods is more, many units have their own technical secrets, there are mainly classified into the three, one is arc welding; Secondly, the automatic welding; Three is the intersection of welding, we on the comprehensive study, this paper discusses three methods of processing characteristics, the hope can be helpful to platinum rhodium thermocouple production enterprises, speed up the pace of reform and innovation, enhance the level of national platinum-rhodium thermocouple industry processing as soon as possible to meet the needs of the rapid development of iron and steel industry.

1 arc welding machine

in a low voltage dc power supply device, a very accidentally silk, another extremely the carbon rods [ Or molybdenum rods] , carbon rod double accidentally silk produce arc and accidentally touch fused balls. This method USES the earlier, also very extensive.

the advantages: simple equipment, easy operation, melting point solid.

drawbacks: (1) solder joints are easy to pollution, carbon rod and wire pair contact arc, easy to make carbon particles adhering to the melting point. (2) the spot size is difficult to control, welding time decided to solder joint size, because human arc is difficult to control the length of time, so the melting point size is large. More than 5 ~ 5 mm, and the more fine silk, need the longer the wire, causing a large number of precious metals platinum rhodium wire loss.

2 automatic welding hot

send doll from wire, welding, to wear quartz tube, etc. All done automatically by the production line equipment. Its characteristic is: (1) the automatic operation of the equipment, high welding efficiency. (2) solder joints free from contamination. (3) the welding pressure, time and current, according to the need to set, automatic control in the operation of equipment, can make the solder joint even and firm. (4) quantity of welding consumables is bigger. In order to ensure the success rate of mechanical welding, bipartite wire cross out quantity generally about 4 mm. (5) one-time investment is larger, the equipment system is suitable for the enterprise to use production volume larger. 3 intersection welding hot

according to the special needs of platinum rhodium filaments of welding technology, absorbing precision spot welder advanced design concept, both at home and abroad in recent years, the introduction of developed platinum, rhodium thermocouple wire processing equipment, mainly include ac type, such as energy storage and inverter type. PtRh2005 platinum-rhodium thermocouple wire welding machine, according to the contact resistance between the welding, the application of single chip microcomputer to digital welding process and welding current adjustment and synchronous control, to achieve the efficient, reliable, safe and pollution-free high-quality welding. ( 1) Platinum rhodium thermocouple wire welding machine the main technical indicators:

(1) welding power source: AC220V 50 hz 10 a maximum input current; 5 kva maximum current 300 a, open voltage 3 v. (3) conditions of use: ambient temperature: 0 - 60oC； Humidity: less than 90%; (4) welding procedure set: according to the need to adjust the program project, delay a keep a rise in a welding a decline; (5) frequency setting: 0 ~ 99 hz; 6 set relative abundance of current: 0 99, said current from small to large, no more than 10 a biggest; All landowners welding stress: 1 N ~ 5 N ( 0. 1 ~ 0. 5公斤) The regulation; End electrode trip: 10 ~ 20 mm; Pet-name ruby automatically records the number of welding. ( 2) Platinum rhodium thermocouple wire welding machine main characteristic

(1) hot spot welding no pollution. Under the high-strength electric welding machine, 3 ~ 5 s time to platinum rhodium thermocouple platinum rhodium wire welded together by itself of the positive and negative end. Because do not need to plus any material medium, operation process to avoid the wire and the solder joint pollution phenomenon. (2) solder joints evenly, accurate and high efficiency. Platinum-rhodium thermocouple platinum rhodium wire welding when the positive and negative cross shaped, solder joint is superposition of two wire diameter, wire thickness unchanged, each solder joints are the same size, realize the request of the hot spots are uniform. 1 mm. Checked by actual measured with working experience of operators, a week can be processed per hour platinum rhodium wire for 350 ~ 540. (3) save 10% ~ 15% platinum rhodium wire, electric arc welding platinum rhodium wire, each is negative I need burning-out 3 to 5 mm, used to form a round ball solder joints, 27 mm wire, if do need to cut wire ( Platinum and platinum rhodium wire) The 30 ~ 32 mm. 5 mm material. 5mm