[450dualsport]

I want to get some 309 stainless as I understand that it is the best filler to use for welding dis-similar metals such as mild steel to stainless. In looking at my supplier's website, there seems to be 3 types: 309, 309L, and 309LSi. In general, which of these fillers would be best for "all purpose" use?

I realize that they probably all have specific applications, but I just wanted to get a bit to experiment with.

[AFSATCOM]

I want to get some 309 stainless as I understand that it is the best filler to use for welding dis-similar metals such as mild steel to stainless. In looking at my supplier's website, there seems to be 3 types: 309, 309L, and 309LSi. In general, which of these fillers would be best for "all purpose" use?

I realize that they probably all have specific applications, but I just wanted to get a bit to experiment with.

309L the L means low carbon and less prone to cracking

LSi adds silicon. No experience with it so can't comment

[Braehill]

The addition of silicon is for the mild steel to help flux it a little, but if you plan to use it on stainless to stainless of a different make up it has little benefit. I choose the 309L if I'm paying, it's good for stainless to stainless and stainless to mild and low carbon steel. They all work well for their intended purpose but I use the straight 309 the least.

Len

[450dualsport]

Thanks for the input. I will give the 309L a try.