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  1. #1
    Join Date
    Jul 2008
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    Delhi, Ontario:
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    Question Welding AR 400 Plate

    Does anyone have experience welding AR400 plate ?

    I have a job comming next week, I'll be welding a 4'x 6' AR 400 plate inside of a Large vat for mixing types of soil & fertlizer

    I haven't seen it yet , but from what they say it's quite a large Vat .

    So any insight from anyone that's done this before would be great !
    It's being Rolled this week , to be installed next week .

    .......... Norm

    Sunrise Outside My Shop In Delhi, Ontario

    - Arcair- K 4000 CAC.

    - LN-25 Wire Feeder

    - Lincoln Ranger 8- Engine Drive- CC\CV:



    - Lincoln Power Mig 180C
    - Spoolgun.
    - DeWalt Chop Saw .
    - DeWalt Compressor - 13cfm, @ 100 psi.

    www.normsmobilewelding.blogspot.com

  2. #2
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    Jul 2006
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    1,508

    Default

    Norm right from Lincoln.

    AR400 is a quench and tempered steel and may be difficult to weld due its high strength and hardenability. The base steel around the weld rapidly heats and cools during welding, resulting in a heat affected zone (HAZ) with high hardness. Any hydrogen in the weld metal may diffuse into HAZ and may cause hydrogen embrittlement, resulting in delayed underbead or toe cracks outside of the weld. To minimize heat affected zone cracking:
    Use a low hydrogen consumable with an -H4 or -H2 designation.
    Preheat to slow the cooling rate. Note that excessive preheat may anneal the base material.
    Slow cool. More time at elevated temperatures allows the dissolved hydrogen to escape.
    Peen the weld beads to minimize residual weld stresses.
    Use the lowest strength filler metal meeting design requirements. If making fillet welds, the weld can be oversized to give the specified strength
    Minimize weld restraint.
    Caution!
    These are "my" views based only on “my” experiences in “my” little bitty world.

  3. #3
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    Jul 2008
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    Delhi, Ontario:
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    Default AR 400 plate.

    Quote Originally Posted by Sonora Iron View Post
    Norm right from Lincoln.

    AR400 is a quench and tempered steel and may be difficult to weld due its high strength and hardenability. The base steel around the weld rapidly heats and cools during welding, resulting in a heat affected zone (HAZ) with high hardness. Any hydrogen in the weld metal may diffuse into HAZ and may cause hydrogen embrittlement, resulting in delayed underbead or toe cracks outside of the weld. To minimize heat affected zone cracking:
    Use a low hydrogen consumable with an -H4 or -H2 designation.
    Preheat to slow the cooling rate. Note that excessive preheat may anneal the base material.
    Slow cool. More time at elevated temperatures allows the dissolved hydrogen to escape.
    Peen the weld beads to minimize residual weld stresses.
    Use the lowest strength filler metal meeting design requirements. If making fillet welds, the weld can be oversized to give the specified strength
    Minimize weld restraint.
    Thanks Sonora;
    I was somewhat framiliar with what you stated above.
    So E- 7018- H4 would be the best rod to use, with mild pre-heat.

    I'm not sure how I could slow the cool down time?
    Peening , Yes !
    It's a fairly large piece of plate- 4'x6' rolled , I'm not sure of it's thickness.
    Do you think I should back - step my way around the perimiter ?

    .............. Norm

    Sunrise Outside My Shop In Delhi, Ontario

    - Arcair- K 4000 CAC.

    - LN-25 Wire Feeder

    - Lincoln Ranger 8- Engine Drive- CC\CV:



    - Lincoln Power Mig 180C
    - Spoolgun.
    - DeWalt Chop Saw .
    - DeWalt Compressor - 13cfm, @ 100 psi.

    www.normsmobilewelding.blogspot.com

  4. #4
    Join Date
    Jul 2006
    Posts
    1,508

    Default

    I back step everything!!!!!!!!!!!!!!!!!!!!!!!!!!
    Maybe rent one of these for the post heat?


    http://www.masterheaters.com/kero/
    Caution!
    These are "my" views based only on “my” experiences in “my” little bitty world.

  5. #5
    Join Date
    Jul 2008
    Location
    Delhi, Ontario:
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    Default AR 400 plate .

    Sonora, No I don't think I'll use one of those heaters !

    It's a very confined space !
    I'll be inside a Vat welding a 4' x 6' plate , Hot and Smokey enough !!!!!!!!!!

    ............ Norm

    Sunrise Outside My Shop In Delhi, Ontario

    - Arcair- K 4000 CAC.

    - LN-25 Wire Feeder

    - Lincoln Ranger 8- Engine Drive- CC\CV:



    - Lincoln Power Mig 180C
    - Spoolgun.
    - DeWalt Chop Saw .
    - DeWalt Compressor - 13cfm, @ 100 psi.

    www.normsmobilewelding.blogspot.com

  6. #6
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,383

    Default

    I remember welding it down in conveyors, mild pre-heat and lo-hi. I dont think its a big deal.

  7. #7
    Join Date
    Jul 2006
    Posts
    1,508

    Default

    Quote Originally Posted by nfinch86 View Post
    Sonora, No I don't think I'll use one of those heaters !

    It's a very confined space !
    I'll be inside a Vat welding a 4' x 6' plate , Hot and Smokey enough !!!!!!!!!!

    ............ Norm
    LOL!
    No I meant after you’re completely done. Aim the heather inside the vat, and let it cool with just this amount of heat.
    Caution!
    These are "my" views based only on “my” experiences in “my” little bitty world.

  8. #8
    Join Date
    Jul 2006
    Posts
    1,508

    Default

    Quote Originally Posted by Sberry View Post
    I remember welding it down in conveyors, mild pre-heat and lo-hi. I dont think its a big deal.
    That is all I ever done too. I was a little set back by how detailed Lincoln made it out to be. Guess I was lucky all those years!
    Caution!
    These are "my" views based only on “my” experiences in “my” little bitty world.

  9. #9
    Join Date
    Jan 2008
    Location
    So. Cal
    Posts
    100

    Default

    Nabed this from the hobartwelders

    http://www.hobartwelders.com/weldtal...ad.php?t=19493
    Fab Tech

  10. #10
    Join Date
    Jul 2008
    Location
    Delhi, Ontario:
    Posts
    1,969

    Question AR 400 Plate

    Thanks, Fab Tech, Sonora & everyone else !!!!!!!!!

    I do have one of those propane heaters, but the darn thing will lite but Not stay lit .

    So I guess it will be E-7018- H4 or H2 , with mild pre- heat, back stepping around the perimeter, peening as I go !
    It's an inside job, so it should not cool too quickly, maybe cover it with a weld blanket .

    ............ Norm

    Sunrise Outside My Shop In Delhi, Ontario

    - Arcair- K 4000 CAC.

    - LN-25 Wire Feeder

    - Lincoln Ranger 8- Engine Drive- CC\CV:



    - Lincoln Power Mig 180C
    - Spoolgun.
    - DeWalt Chop Saw .
    - DeWalt Compressor - 13cfm, @ 100 psi.

    www.normsmobilewelding.blogspot.com

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