take a listen to the welding tips and tricks podcast episode on selecting the right filler metal
OK you bought a tig welder, you bought a tig welding torch, and you got some tungsten electrodes.
Now its time to get some Tig Welding Rods.
Its kind of hard to find information on what tig welding rod to use for what metal. So I will give you some down and dirty advice on what rods you need to handle most anything.
I am not an engineer or metallurgist and I dont even play one on TV.
But here is what I do...
E70s2 mild steel tig welding rod - use for welding 4130 chromoly tubing, all mild steel, and even cast steel. (tip....if you have a roll of bare mig wire like e70s3 or e70s6, it will work great in a pinch...just snip some off and straighten...or better yet if its too small, double it up and chuck it up in a cordless drill and twist it tight so you wont have to feed so much wire)
Dont use coat hanger wire and dont use gas welding rods. both will cause porosity and give you problems.
Since gas welding rods like RG45 look almost the same as tig rods, I have seen numerous situations where a welder was troubleshooting gas connections and changing cup size, where the only problem was using rg45 gas welding rods.
its always a good idea to look for an ID stamp or look at the package the rods came in to make sure you have er70s-2 or 6 rather than rg45 or rg65 gas welding rods. ( they dont have proper deoxidizers for tig welding)
ER70S-2 is cheap anyway. so why skimp
ER70s-6 is an alternative to ER70S-2 and flows better in certain applications due to higher silicon content
ER308L stainless tig rod - when you know that you are welding 300 series stainless steel, (304 is the most common 300 series stainless used), you cant go wrong with er308L rods.
there are a lot of other stainless steel filler rods, like 316L, 321 and others and if you know what you are welding, its best to use a match.
Hastelloy W - this is all I need for welding steels that I am not sure of and a whole bunch of other stuff like... stainless steel of unknown grade to carbon steel? use Hast W
Tool steel welded to Stellite? use Hast W.
get the picture?
When you know it is some type of steel, but you are not completely sure exactly what grade of steel...., Hastelloy W covers a multitude of sins.
CYA note: if it is a critical weld, you need to know what kind of steel you are welding
update.....since I originally posted this page hastelloy W has gone way up in price.
Another really good all purpose rod for welding most stainless to most carbon steel is ER312...its easier to find and a lot cheaper.
And if you cant find ER312 then ER309 is also a great rod to use for when you know its steel but not sure exactly what grade.
IF you take at look at this stainless filler metal chart, you will see 309 recommended a whole bunch for joining different stainless alloys.
***for critical work, you really need to determine the metal type and weld with the correct filler metal
4043 aluminum tig rod - the most versatile for 3003, 6061, a355 aluminum castings etc.
and do yourself a favor and get some 4047 aluminum filler rod for castings where porosity rares its ugly head.
4047 filler rod contains 12% silicon. That makes it flow better, with less porosity.
use 5356 for 6061 aluminum when the weld will be anodized after welding
er309L stainless - when mild steel is just too dirty and you need to tig it. 309 stainless will weld hot rolled steel without porosity.
This is not for critical welds that will kill somebody if the weld fails...but it works.
309 stainless is used routinely for making critical welds in the power generation industry. It is designed for welding stainless steel to carbon steel.
Common sense would dictate that if that is the case , the resulting welds would be of a different chemistry on the carbon side of the weld than on the stainless side. Still, they hold up for years even under stress and thermal cycles...
So a bracket on your car should be no problem.
Alladin 3 in 1 for tig welding pot metal jobs. and remember, when you are welding pot metal and things start to flow good, its about to go south.
so when things start to flow...STOP and let cool.
Chronatron makes some pretty good nickel tig rod for welding cast iron.
but I found another rod I have been using with good results.
aluminum bronze - for tig welding cast iron repair jobs on A/C....What??? dont laugh it works great.