Tungsten and Lanthanum Electrode Properties

The video tutorial by Brucie from the Longevity Learning Lab discusses tungsten electrodes used in TIG welding. It covers the properties and applications of pure tungsten, thorium alloyed tungsten, lanthanum alloyed tungsten, and cerium alloyed tungsten. The tutorial highlights the advantages and safety concerns of each type, emphasizing the shift from radioactive thorium to safer alternatives like lanthanum and cerium. The video concludes with a summary of the different tungsten electrode types and their uses in welding.

What is the symbol for tungsten on the periodic table?

• Tu

• W

• Tg

• T

What is a major issue with using pure tungsten in TIG welding?

• It is not conductive

• It has a low melting point

• It tends to ball up and contaminate

• It is too expensive

Why is thorium alloyed with tungsten considered a safety concern?

• It is highly flammable

• It is radioactive

• It is too brittle

• It is not conductive

What is the color code for lanthanum alloyed tungsten electrodes?

• Green

• Blue

• Red

• Yellow

Which element is used in both electric car batteries and tungsten electrodes?

• Thorium

• Tungsten

• Lanthanum

• Cerium

What percentage of lanthanum is typically used in tungsten electrodes?

• 5%

• 10%

• 1%

• 2%

Which element is added to tungsten to create a more stable arc at higher amperages?

• Tungsten

• Cerium

• Lanthanum

• Thorium

What is the periodic table number for cerium?

• 57

• 58

• 74

• 90

Why are people moving away from thoriated electrodes?

• They are too expensive

• They are not effective

• They are not available

• They have a radioactive component

What is the main advantage of using lanthanum and cerium alloyed electrodes over pure tungsten?

• They are cheaper

• They are more stable and versatile

• They are easier to manufacture

• They have a higher melting point