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Thread: welding 316L to 304, use of different fillers?

  1. #1
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    welding 316L to 304, use of different fillers?

    I weld a lot of 316L Pipe to 304 flanges for a non-sanitary application, specifically Exhaust manifolds. The welding charts suggest using 309 filler since they are dissimilar, but I wonder if it may be better to just use 316L filler? Often, there are lap joints that I just fusion weld, no filler. When filler is needed, I don't see how 309 improves the union between the two base metals. These laps are low stress unions, so I don't have to worry as much about mechanical properties on them.

    I use 316L pipe because it has almost no carbon to limit intergranular corrosion, and it's mechanical properties are slightly better at the products peak operational temps (900-1100* F). The flange material I use is an off the shelf product so no choice in material. 304 is what most other fabricators use for both the pipe and flange material, so no filler paradox for them.

    Stick to the books and use 309 when mixing alloys? Or just use 316L filler?

    I also use mild steel flanges, for those joints I always use 309 filler. I've been making these parts for a very long time and have not had a mechanical failure using 309 so I'm not trying to cover up a problem, I just don't want to create a new one by switching.

  2. #2
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    Re: welding 316L to 304, use of different fillers?

    309 filler is for stainless too carbon steel. 308L is fine for your project .

  3. #3
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    Re: welding 316L to 304, use of different fillers?

    I always choose 316L when welding one to the other. My rule of thumb is that it is ok to use 316 filler on 304, but not 308 on 316.

    If push came to shove you could probably use 308 as you are getting some base metal dilution to get the molybdenum from the 316 base into the puddle.
    Weld like a "WELDOR", not a wel-"DERR"
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    Re: welding 316L to 304, use of different fillers?

    316 has molybdenum in it.

    316L filler is 18-20%Cr, 11-14%Ni and 3%Mo.

    308 and 309 do not have molybdenum.

    My Lincoln welding book recommends 316 filler with 316 metal including using 316 with 304.

    I just finished a 316 / 304 project and used 316L filler worked fine. I'd use 316L filler.

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    Re: welding 316L to 304, use of different fillers?

    Thanks for the input guys, I've seen several charts with different recommendations. My gut was to use 316L, I just wanted to make sure there weren't any other "gotcha's" that the books don't write about.

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    Re: welding 316L to 304, use of different fillers?

    Quote Originally Posted by Chad86tsi View Post
    Thanks for the input guys, I've seen several charts with different recommendations. My gut was to use 316L, I just wanted to make sure there weren't any other "gotcha's" that the books don't write about.
    Just curious where you found a chart recommending the 309 filler, can you provide a link, thanks.

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    Re: welding 316L to 304, use of different fillers?

    For my weld of 304L to 316 L:

    This one recommends 308:

    http://weld.com/files/Stainless_Stee...tion_Chart.pdf

    This one recommends 308 or 316 when working with 316L, and 309 or 316 for 316.
    http://www.advancedweldingsupply.com...or%20Guide.pdf

    This chart recommends 309L:
    https://drive.google.com/file/d/0B6R...VCRkg1VGc/view

    I did this research many years ago and came to the same dilemma : it depends on who you ask. Now that there is more resource material on the net, I find much more information than I did years ago, but it seems the conclusion is still the same. I prefer to ask actual welders not retailers, which is why I asked here. I think I'll be fine with 308, 309L, and 316L. Several charts spec 309MO, but I'm not going to track that down since the product is not subjected to acids or other harsh corrosion-inducing elements, it's just going to get very hot on a regular basis. Since the 309 and 316 are both low carbon, I think I'll stick to either of those and I'll be fine.

  8. #8
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    Re: welding 316L to 304, use of different fillers?

    either is ok i think. it will not affect the mechinical properties, but it will influence the corrosion resistance properties.

  9. #9
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    Re: welding 316L to 304, use of different fillers?

    Quote Originally Posted by Chad86tsi View Post
    For my weld of 304L to 316 L:

    This one recommends 308:

    http://weld.com/files/Stainless_Stee...tion_Chart.pdf

    This one recommends 308 or 316 when working with 316L, and 309 or 316 for 316.
    http://www.advancedweldingsupply.com...or%20Guide.pdf
    These 2 charts are just wrong. What do you expect from weld.com. Anyway see the cross between 304 and 316, then 316 and 304 and you get different answers. Don't trust them.
    Weld like a "WELDOR", not a wel-"DERR"
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