Welding Tips and Tricks

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.

450dualsport wrote: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

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

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