The welding method on platinum rhodium thermocouple measurements

The platinum rhodium thermocouple measurement welding method is rapid 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. Throughout the domestic platinum thermocouple rhodium thermocouple production enterprises, the existing platinum-rhodium thermocouple hot processing methods is more, many units have their own technical secrets, induces mainly has 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, hoping to help platinum-rhodium thermocouple production enterprises, accelerate the pace of reform, * *, raising the level of processing in domestic platinum rhodium thermocouple industry as soon as possible, to adapt to 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. Disadvantages: (1) solder joint 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 the K type thermocouple manual arc is difficult to control the length of time, so the melting point size is large. (3) welding consumables amount is larger, the welding requirements solder ball diameter is commonly 2 ~ 5 times the diameter of the wire, 2 per dual wire need to consume the double wire. 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 hot from send doll wire, welding, automatic 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 joints are armoured thermocouple, 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 spot according to the special needs of platinum rhodium filaments of welding technology, absorbing the precision spot welding machine both at home and abroad advanced design concept, introduced in recent years, developed a 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, has realized the efficient, reliable, safe and pollution-free waiting for welding. ( 1) Platinum rhodium thermocouple wire welding machine the main technical indicators: (1) welding power source: AC220V 50 hz * 10 a large input current; (2) the welding transformer output: rated power 1. 5 kva * large 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 rise a welding, thermal resistance decreased to keep; (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; All landowners welding stress: 1 N ~ 5 N ( 0. 1 to 0. 5 kgf) 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 characteristics (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. After soldering, the will is platinum rhodium thermocouple, negative electrode wire, solder joints on the center line, immediately on the special shear apparatus length cut silk, length error is 0. 1mm。 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. Intersection welding, solder joint outside of the spare parts is only 0. 3 to 0. Do 5 mm, 27 mm silk, only 27. 3 to 27. 5 mm material. Two kinds of technology, using cross welding than save 2 per dual electric arc welding wire. 7 ~ 4. 5 mm, with annual capacity of 30. Dear customer: hello, our company is a strong technical force of the development of high quality, for the majority of users with high-quality products and complete solutions and the best technical services company. The main products are platinum rhodium thermocouple S type thermocouple sheathed thermocouples tungsten-rhenium thermocouples, etc. This enterprise uphold sincerity, with the purpose of the implementation of quality and with enterprising societe generale, with a firmer step climb the new peak unceasingly, contribute to national automation industry, welcome new and old customers to rest assured the choose and buy the desired products. We will serve you wholeheartedly!