stainless welding wire

[kamaroman68]

Matt if you are out there I have another question for you..... You reccomended me to use ss ER309 mig wire. I ordered some from mcmaster carr and they sold me ER309L. Any differences and should I not use it? Thanks Chris

[Matt@RFR]

For the long answer, read this (http://content.lincolnelectric.com/pdfs/products/literature/c64000.pdf) and this (http://content.lincolnelectric.com/pdfs/products/literature/c610.pdf).
The short answer is that 'L' signifies Low carbon content in stainless alloys. These are generally preferred because they end up with less internal stress in the weld, and in the case of dissimilar metal weldments, can reduce the likelyhood of hot cracking.

Please be aware that ER308x is the prefered filler for 304 base metal.

[kamaroman68]

So Matt, 2 more questions for you. What wire would you use to go 304 to 304 ss and #2 where do you find all of this information??? Thanks Chris

[Matt@RFR]

Here's (http://www.jwharris.com/welref/techguide/alloy_for_stain_steel/filler_metal/) a stainless filler metal selection chart, but to quickly answer your question: 304-304 joint would need 308 filler.

I found the above link with a search on "stainless filler selection chart" or some such...it's been a few years. I have it, a mild steel chart, an aluminum chart, and a magnesium and titanium chart on my office wall.

[DeepBlue68]

Totally off topic, but I've heard that Ti has to be welded in a vaccum - is this true?

[Matt@RFR]

Not to be rude, but use the search, guys! Below are the search results for "welding titanium". Happy reading.

https://www.pro-touring.com/forum/showthread.php?t=9333&highlight=welding+titanium
https://www.pro-touring.com/forum/showthread.php?t=3285&highlight=welding+titanium