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  1. #1
    Join Date
    Mar 2012
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    25

    Default stainless to steel welding

    We are welding cheap stainless ( little bit ferrous) I can feel a little pull from a magnet.. to a 4" galv coated post. We are grinding the galv off & welding with a 70 S6 standard steel wire. Does anyone see a problem with this? we weld steel & aluminum usaully & make these welds maybe twice a month. The welds look good & have good deep penetration. Just curious if this might fail in the future. your thoughts!!

  2. #2
    Join Date
    Mar 2007
    Location
    Deltaville, VA
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    2,239

    Default

    309 SS wire would be a better choice.
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  3. #3
    Join Date
    Mar 2012
    Posts
    25

    Default

    With Argon?

  4. #4
    Join Date
    Mar 2007
    Location
    Deltaville, VA
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    2,239

    Default

    I'd use C25 since the mild steel will rust anyway. The weld bead will be more corrosion resistant than the base metal.

    For SS to SS I still use Tri-Mix for short arc.
    Syncrowave 250 DX Tigrunner
    Dynasty 200 DX
    Miller XMT 304 w/714D Feeder & Optima Control
    Miller MM 251 w/Q300 & 30A SG
    Hobart HH187
    Dialarc 250 AC/DC
    Hypertherm PM 600 & 1250
    Wilton 7"x12" bandsaw
    PC Dry Cut Saw, Dewalt Chop Saw
    Milwaukee 8" Metal Cut Saw, Milwaukee Portaband.
    Thermco and Smith (2) Gas Mixers
    More grinders than hands

  5. #5

    Default stainless to steel welding

    I have been a pipe and tube welder for about 10 years when we make a dmw or dissimilar metal weld we use inconel idk how critical you need to be on your project though

  6. #6
    Join Date
    Aug 2007
    Posts
    730

    Default

    Quote Originally Posted by Waymack View Post
    I have been a pipe and tube welder for about 10 years when we make a dmw or dissimilar metal weld we use inconel idk how critical you need to be on your project though
    What is the advantage of using iconel over SS.
    Nick

  7. #7

    Default

    now Im no metallurgist but from what I understand inconel has a mixture of metals that will weld properly to carbon chrome or stainless this is for high heat high pressure lines now if it's not anything critical weld it with whatever u want if it's gettin painted weld it with carbon

  8. #8
    Join Date
    Mar 2012
    Posts
    25

    Default

    It is a 4" flange to hang an aluminum gate on. welded all 4 sides. gate does not weigh 100 pounds. like I said the welds look good & the stainless is not pure. CHINA CRAP probably. I can fell resistance with a magnet. After we weld we are powder coating the whole pc.

    I did order some 309 ss wire for the future. I just hope what I have out there now will not fail. Any thoughts on this. will they fail?

  9. #9
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,913

    Cool

    Quote Originally Posted by solhauls View Post
    I did order some 309 ss wire for the future. I just hope what I have out there now will not fail. will they fail?
    Depends on who is welding them and what gas is being used. Yes it will fail if the weld looks like bird droppings and no they won't fail if the area is prepped properly and the welds are good...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
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  10. #10
    Join Date
    Jun 2006
    Location
    Maine
    Posts
    732

    Default

    Quote Originally Posted by solhauls View Post
    & the stainless is not pure. CHINA CRAP probably. I can fell resistance with a magnet. After we weld we are powder coating the whole pc.
    What do you mean the stainless "is not pure?" what you're welding to is most likely a 4xx series stainless. 400 series (like 409) are non-austentic and will be slightly magnetic. if you're using ss exhaust pipe... it more than likely is 400 series.
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