K type explosion-proof thermocouple welding method1

K type explosion protection thermocouple is a type of thermocouple, has a certain application in multiple industries. K type explosion-proof thermocouple welding method we ever know? K type explosion-proof welding method of thermocouple is actually more, under the engineering to detailed introduce for everybody.

1, argon arc welding of K type explosion-proof thermocouple

by dc argon arc welding device, welding torch, welding power source, the high frequency oscillator butt welding power source, such as clamping apparatus of five parts. During welding, using cerium - out of welding gun nozzle Tungsten wire as cathode, is fixed on the fixture welding thermocouple as the anode. When will pilot arc by high frequency, high voltage between the two poles, adopts thyristor voltage regulation, control arc intensity, make the cerium - under argon protection Tungsten arc discharge and the welding between the thermocouple, using arc produced by high temperature melt end of thermocouple wire into small balls. Aim to facilitate the thermocouple with electrodes, work fixture and welding torch can be horizontal and vertical direction in space. Within the welding torch with cerium - 1 mm and 15 mm diameter Tungsten electrodes, is for the use of the different diameter thermocouple welding.

2, carbon powder welding K type explosion-proof thermocouple

carbon powder welding device is similar to arc welding, the difference is the power of a highly is the carbon rods, but containing powdered carbon graphite crucible, other are soldered thermocouple. When welding, the hot electrode inserted into graphite powder, welding is good after a few seconds. This kind of welding method is arc welding is convenient, but easy cause thermal electrode brittle fracture. The method is suitable for inexpensive welding metal thermocouple.

3, welding K type explosion-proof thermocouple

when the welding is used, should first will heat the top electrode heating and dipped in flux ( Such as nickel and chromium - Nickel silicon coupling flux is mixture of sodium tetraborate and quartz sand each half) , and then put the hot electrode acetylene or oxyhydrogen flame, after being fused spherical out quickly, immediately into the hot water wash away residue of welding point. This method is simple, widely used. Suitable for inexpensive welding metal thermocouple.

4, brine welding K type explosion-proof thermocouple

in the beaker in sodium chloride solution, in water solution into the platinum wire and electrode, and hot electrode as the other. Welding, the solutions of thermocouple at the top with a little contact, connected to the power supply, after waiting for striking power off quickly. This kind of welding method and welding thin 003 mm diameter - shall apply 3 mm thermocouple.

5, arc welding K type explosion-proof thermocouple

arc welding can be divided into two kinds:, a tributary of the welding and ac welding

5 - Positive 1 dc welding, thermocouple, carbon rod ( The spectrum) Connect power anode, carbon and heat the top electrode momentary contact arc starting, after waiting for measuring end fused spherical carbon rod quickly left. This kind of welding method is simple, easy to operate, measuring end not defiled, used in welding metal thermocouple.

5- 2 ac welding is suitable for the welding metal thermocouple. Will measure carefully before welding, 25 A 30 mm oxide was removed, and then to the top of the two electrodes and qi, and ground into twist shape. During welding, at the top of the hot electrode dipped in flux, under arc melting 3 - in a flame of fire 5 s, after waiting for spherical quickly remove and clear away residue on the solder joint. This method is simple in equipment, easy operation, but the thermocouple near the welding points and electrode carburizing defiled.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor