Question 1

what is the difference between the red & blue electrodes?

Accepted Answer

The following information is from weldingweb (dot) com.ZIRCONIATED Tungsten Color Code WHITE or BROWN, are best suited for AC Tig welding applications.Zirconiated, White, AC Welding applications. Better start up than Pure Tungsten, Balls up well and has a more stable arc than Pure Tungsten. Better current carrying capacity and high resistance to contamination during welding.LANTHANATED Tungsten Color Code BLACK, GOLD or BLUE, is suitable for AC & DC welding applications.Lanthanated, Black, AWS Class EWLA-1.5, AC & DC welding applications. Non-Radioactive Good arc characteristics in ac/dc applications. Applications: carbon & stainless steel, nickel alloys and titanium.CERIATED Tungsten Color Code GREY or ORANGE, are best suited for low amperage DC welding applications.Ceriated, Grey, An excellent alternative to Thoriated tungsten especially in low amperage welding. Takes 10% less current to start and has a very stable arc.PURE Tungsten Color Coded GREEN, are best suited for AC Tig welding applications.Pure Tungsten, Green, AWS Class EWP, AC welding applications. Least expensive of all electrodes. Applications: aluminum and magnesium alloys.THORIATED Tungsten Color Code RED, YELLOW, MAUVE or ORANGE, is best suited for DC Tig welding applications.2% Thoriated, Red, AWS Class EWTH-2, DC welding applications. The most common type of electrode used today. Applications: carbon & stainless steel, nickel alloys and titanium.

Question 2

What do the colors mean that are on the tungsten?

Accepted Answer

Blue=2% Lanthanated
Red=2% Thoriated
Green=100% pure tungsten

Question 3

Can I weld stainsteel and aluminum with this rod

Accepted Answer

Yes but it probably can only weld thinner aluminum 1/8 or less because aluminum uses ac and a lot more amps then dc steal  welding

Remember to round your electrod by reducing to balance to 30% until it melts to round ballon end. 
Then back to 70% and start welding to your aluminum

Question 4

What type of Tungsten do you prefer for stainless steel . Thank you

Accepted Answer

This is primarily for running AC on a transformer machine (aluminum, magnesium, etc.). For stainless I would recommend a ceriated, thoriated, or a trimix type tungsten.

ASIN	B013KZ2BIA
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#8,968 in Automotive ( See Top 100 in Automotive ) #7 in TIG Welding Equipment
Color	Blue
Customer Reviews	4.8 4.8 out of 5 stars (4,917)
Date First Available	August 7, 2015
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	6 ounces
Item model number	40400-TigAll
Manufacturer	Midwest Tungsten Service
Material	Blue - 2% Lanthanated
Package Dimensions	8.03 x 2.32 x 0.28 inches
Part Number	40400-allTIG
Size	3/32"

Midwest Tungsten Service TIG Welding Tungsten Electrodes 10-Pack (Blue - 2% Lanthanated Tungsten (WL20/EWLa-2), 3/32")

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