Lanthanum tungsten electrodes is already the internationally popular electrode materials, especially the content is 1.5% ( with a content of 2.0% difference) lanthanum tungsten electrode . Scientific research study showed that 1.5% lanthanum tungsten, tungsten thorium with the nearest 2.0% demonstrated conductive properties, therefore , welding personnel can easily replace the electrode , rather than replace the device parameters. In 1998 there is a very famous field trials , is to 2.0% thoriated tungsten electrodes , 2.0% cerium tungsten electrodes and two vendors 1.5% lanthanum tungsten electrodes at 70 Ann 150 amps , 300 volts DC environment for welding tasks , the fruit is , in both cases , 1.5% lanthanum tungsten electrodes have demonstrated its excellent welding performance , but also reflects its small burn rate characteristics. Lanthanum tungsten electrode is also suitable for AC welding tasks , and performance excellence.

Lanthanum tungsten electrode welding because of its good performance in the international welding industry concern. Lanthanum tungsten electrode conductivity closest WT20 thorium tungsten electrode . Therefore , welders welding operation without changing any program can use this convenient alternative thorium tungsten electrode electrode . This shift , whether in exchange conditions or under DC conditions are easier. Another advantage of lanthanum tungsten electrode performance at its current high durability and burning the minimum rate .


Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-alloy.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com;sales@xiamentungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
 

In order to take power system with excellent performance and no radioactive contamination of tungsten electrode, tungsten trioxide powder of lanthanum oxide was added , after reduction, vertical melt , swaging , drawing obtained Φ2.7mm lanthanum tungsten electrode with the same specifications cerium tungsten, tungsten thorium power level for the electrical performance comparison , while a scanning electron microscope , measuring the electrical performance test tungsten lanthanum , cerium tungsten electrodes lanthanum , cerium content and microstructure of the distribution . The results showed that: Lanthanum tungsten electrode tungsten electrical performance than cerium , thorium tungsten ; lanthanum oxide, lanthanum tungsten migration rate , evaporation rate is low , to form a better lap dovetail organization with high temperature creep performance.

Lanthanum tungsten electrode manufacturing method with the use of lanthanum nitrate lanthanum tungsten-coated powder preparation methods, in common with the reduction of time is prolonged, the lanthanum average particle size of the tungsten powder coated grow . The lanthanum nitrate reduction by more sensitive to the impact of time , the average increase in grain size range. The method of the present invention , lanthanum tungsten-coated powder particle size by reducing the influence of time fluctuation is small, in the particle size range within a certain time basically converge. These two different approaches are eventually encapsulated in the form of La2O3 tungsten , plays the role of grain refinement , but due to their respective decomposition temperature differences inevitably lead to the difference in outcome . The method of the present invention , the specific process conditions, the particle size range of less volatile , and in accordance with repression, burn process requirements , which can effectively reduce gasification process , helping to eliminate harmful gases nitrogen oxide pollution is a more ideal method for preparing lanthanum tungsten electrodes .


Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-alloy.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com;sales@xiamentungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

 

Lanthanum tungsten electrode manufacturing method relates to a method mainly used for TIG ( tungsten inert gas welding ) and PLASMA ( plasma ) technology for metal welding , cutting, spray coating , smelting a method of manufacturing the tungsten electrode . Wherein : a, and include use of lanthanum acetate APT, tungsten and tungsten trioxide powder made ​​of solid material slurry water mixed to prepare lanthanum tungsten-coated powder ; b, lanthanum tungsten-coated powder decomposition of lanthanum the process is carried out in a hydrogen atmosphere . The method of the present invention can be more fully decomposed lanthanum , significant improvement in the melt down process Chinese conductivity material , and the decomposition of the lanthanum salt and reduction process in the same equipment at the same time , simplify the process, which can effectively reduce the hours of work, saving energy.

Lanthanum tungsten electrode welding in alternating current outstanding performance . Also, because the end of the electrode in the welding process spherical, contamination resistance is very strong, very suitable for welds shall be subjected to serious pollution of the occasion . Lanthanum tungsten electrode is a hundred years European countries have introduced a class of products , the purpose is expected to replace with radioactive thorium tungsten electrode . Once launched , lanthanum tungsten electrode will by the international community praised the welding , and its export volume has considerable tungsten electrodes with thorium . Lanthanum tungsten electrode is characterized by conductive properties closest to 2% thoriated tungsten electrodes , durable high burning rate of the current minimum .

Lanthanum oxide, lanthanum component comprising tungsten oxide, lanthanum into 2 %, 1.5% , 1%, three levels . Lanthanum is a rare earth, and no radioactive , it is known as lanthanum tungsten electrodes substituted products thoriated tungsten electrode . Lanthanum tungsten electrode is mainly used for DC welding, AC welding can also play a good effect . 1.5% lanthanum tungsten electrode , low current, easy arc starting and stable low current arc . 2% lanthanum tungsten thorium tungsten electrode life longer than in most use arcing easier . Especially good (a) to prevent thermal shock , (b) short cycle repeated ignition welding case , the welding good (c) to avoid contamination.


Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-alloy.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com;sales@xiamentungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

 

Case 1.

Take APT powder 1000 grams , adding 1000 grams of water , stir , add 60 grams of lanthanum lanthanum continue to stir , steam heated and concentrated , dried and sieved to obtain lanthanum tungsten-coated powder . The prepared lanthanum tungsten-coated powder loaded boat , put through a hydrogen reduction furnace , heated to conduct a reduction temperature of 600 ℃, the reduction time is 2 hours. Then continue to a second temperature to 800 ℃ restore , restore time control in 3.5 hours , the hydrogen flow rate during 0.5m3 / h. Then lanthanum tungsten-coated powder into alcohol , glycerin lubricant mixing one hour after sifting , pressing, burn , pressing, calcining process conditions: loading powder quantity :650-700g / root , repression burn pressure : 60 ~ 80MPa sintering temperature : 1050 ~ 1400 ℃, sintering time : 40 ~ 60 minutes. Then using a conventional vertical melt sintering process , process conditions are as follows : vertical melt temperature : 2600 ~ 3000 ℃, holding time : 20 minutes Cooling time: 2 minutes , cooling time: 3 minutes . Finally finished processing , vertical melt billets after passing inspection , will be qualified blanks , into protected with a hydrogen furnace , then the sample temperature for 20 minutes to process requirements , as required swaging , and then processed to the desired product with different specifications .

Example 2.

Take tungsten powder 700 g , add 700 grams of water , stir , add 55 grams of lanthanum lanthanum continue to stir , steam heated and concentrated , dried and sieved to obtain lanthanum tungsten-coated powder . The prepared lanthanum tungsten-coated powder loaded boat , put through a hydrogen reduction furnace , heated to conduct a reduction temperature of 650 ℃, the reduction time 2 hours . Then continue to a second temperature to 900 ℃ restore , restore time control in four hours , during the hydrogen flow 0.5m3 / h. Other conditions are the same in Example 1 .

Example 3.

Take tungsten trioxide powder 850 g , add 850 grams of water , stir , add 58 grams of lanthanum lanthanum , continue stirring evenly, by steam heated and concentrated , dried and sieved to obtain lanthanum tungsten-coated powder . The prepared lanthanum tungsten-coated powder loaded boat , put through a hydrogen reduction furnace , heating get in a reduction temperature of 670 ℃, the reduction time 2.5 hours . Continue to warm to 970 ℃ for secondary reduction, reduction time control in five hours , during the hydrogen flow 0.5m3 / h. Other conditions are the same in Example 1 .


Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-alloy.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com;sales@xiamentungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn