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  1. #1
    Join Date
    Apr 2005
    Location
    Saskatoon, Saskatchewan
    Posts
    220

    Default Welding stainless to mild steel

    I have a job coming up where I need to TIG stainless exhaust tubing to a mild steel flange. I recall hearing using 309 filler rod for welding stainless to mild steel. What are the benefits as compared to welding with 308 filler? Less prone to cracking?

    I'm assuming the tubing is 304 stainless.
    Thermal Arc 185TSW, Lincoln SP135+, 4-post automotive hoist, 2x media blast cabinets, 50 ton press, 80gal air compressor, 4-1/2"x6" bandsaw, 4'x4' Torchmate CNC table with plate marker, Hypertherm Powermax 65 plasma cutter, ultrasonic cleaning stations

  2. #2
    Join Date
    Dec 2006
    Location
    Alaska
    Posts
    732

    Default

    Excellent question.
    TJ
    TJ______________________________________

  3. #3
    Join Date
    Apr 2005
    Location
    Saskatoon, Saskatchewan
    Posts
    220

    Default

    Quote Originally Posted by Fat-Fab.com View Post
    Excellent question.
    TJ
    Excellent answer.

    Well the reason I ask is because I have a lot of 308 filler and I don't think I will do a lot of stainless-mild steel welding (I've never been approached until now). The local welding outlet charges (for some reason in Sask we get charged A LOT...) for 309L filler 1/16" = $25.07/lb and 3/32" = 23.92/lb. Now I'm just wondering if I can get away with 308 unless it's an absolute no-no.
    Thermal Arc 185TSW, Lincoln SP135+, 4-post automotive hoist, 2x media blast cabinets, 50 ton press, 80gal air compressor, 4-1/2"x6" bandsaw, 4'x4' Torchmate CNC table with plate marker, Hypertherm Powermax 65 plasma cutter, ultrasonic cleaning stations

  4. #4

    Thumbs up go for it

    I use 309an 308 both when welding s.s to m.s, as far as ive heard your ok as long as you dont step down an alloy an you get penetration. I weld on fertilizer blenders that hold 10 ton an have never had a problem with welds failing. You should be fine.

  5. #5
    Join Date
    Mar 2006
    Location
    La Porte, Tx.
    Posts
    56

    Default

    I know here at work, all of our procedures require the 309 filler for the SS/ CS weld, but I think the 308 or 316 will work just fine on that application, ------but that is a good question, I'll have to ask our pressure equipment guys.
    pull-do

  6. #6
    Join Date
    Dec 2006
    Location
    Alaska
    Posts
    732

    Default

    I to use 308-308l for most all of my SS/MS work. I have not had any issues, I don't "know" that is the correct filler or not. On the other hand everything I have welded with it has not be "life safety" at all so I feel ok about it.

    TJ
    TJ______________________________________

  7. #7
    Join Date
    Dec 2005
    Location
    Lodi, CA
    Posts
    1,495

    Default

    Ok, now read a couple of my other recent posts, we all know I'm a "hack" (and also a fruit and a nut ), willing to get away with whatever I can, also read my disclaimer below, I take no responsibility here. I'm not going to get too specific here, again, not sure how long the statute of limitations exist, nobody can prove anything.

    In the years past, I have welded, patched, and built up many 90 degree and 180 degree SS pipes, carrying abrasive material and steam, at pressures ranging from 300 psi to 500 psi, heat and form 1" 1045 steel along the outside of the bend, then weld with plain old 7018 rod, never a problem (and no, 7024 didn't work here, tried it).

  8. #8
    Join Date
    Apr 2005
    Location
    Saskatoon, Saskatchewan
    Posts
    220

    Default

    Cool thanks for the advice guys.

    I get killed around here for filler prices, material prices...heck anything to do with welding... I'm going to be ordering a lot more of my welding items even more now through the states since the Can. dollar is so good.

    After reading these posts I decided to weld it up with 308 filler (all the stainless-stainless pieces) and then autogenous welded the mild steel to stainless around the inside of the flange. On the outside I put three evenly spaced 1/2" long welds using 308 filler. There is no real physical loading on these parts, but there is heat cycling that is my concern for using 308 instead of 309.

    I'm still interested why 309 is recommended in this case as compared to 308. I just can't justify those spending that amount on filler prices here for a job that might come up once in a blue moon.

    Edit: Here are the shots:




    PS I was only paid to do the welding, not the fitup.
    Thermal Arc 185TSW, Lincoln SP135+, 4-post automotive hoist, 2x media blast cabinets, 50 ton press, 80gal air compressor, 4-1/2"x6" bandsaw, 4'x4' Torchmate CNC table with plate marker, Hypertherm Powermax 65 plasma cutter, ultrasonic cleaning stations

  9. #9
    Join Date
    Mar 2006
    Location
    La Porte, Tx.
    Posts
    56

    Default

    I still believe you'll be fine using the 308, why don't you do a search on the make-up of 308 vs. 309 on some of the manufacturers sites or where ever the write ups are.
    I know out here at the plant, we are required to use the 309 on the process piping welds, but I've done some quikie welds on non-process stuff for all kinds of people with no complaints.
    Don't really care for the way 309 runs either, but you have to follow procedures.
    pull-do

  10. #10
    Join Date
    Apr 2005
    Location
    Saskatoon, Saskatchewan
    Posts
    220

    Default

    Quote Originally Posted by pull-do View Post
    I still believe you'll be fine using the 308, why don't you do a search on the make-up of 308 vs. 309 on some of the manufacturers sites or where ever the write ups are.
    I know out here at the plant, we are required to use the 309 on the process piping welds, but I've done some quikie welds on non-process stuff for all kinds of people with no complaints.
    Don't really care for the way 309 runs either, but you have to follow procedures.
    Well that's good to hear. I had the feeling since 309 is recommended for stainless to mild steel welds, by me using 308 it was like using a coat hanger to weld mild steel. But if you guys have done it without a problem for non-life critical stuff, then it should work just fine for this application.

    I will find some time to dig up the differences between 308 and 309 when I find some time.
    Thermal Arc 185TSW, Lincoln SP135+, 4-post automotive hoist, 2x media blast cabinets, 50 ton press, 80gal air compressor, 4-1/2"x6" bandsaw, 4'x4' Torchmate CNC table with plate marker, Hypertherm Powermax 65 plasma cutter, ultrasonic cleaning stations

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