Miller Electric

Welding Discussion Forums

Home » Resources » Communities » Welding Discussion Forums
 
Miller Welding Discussion Forums - Powered by vBulletin

Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1

    Default Welding mild steel to chromoly?

    Does anyone know how this works out? any special filler rods needed? Any other special needs for this process?

    Shawn

  2. #2
    Join Date
    Dec 2007
    Location
    National City CA
    Posts
    1,086

    Default

    Works fine just don't expect the mild steel to do the work that the chromoly should be doing. You may run into the weld cracking due to the lack of similarities between the two metals but over all it's fine.
    Filler rod is not a big issue but it would help if you use a chromoly rod

    What is it exactly you are doing?
    Miller Syncrowave 200 W/Radiator 1A & water cooled torch
    Millermatic 252 on the wish list
    Bridgeport Mill W/ 2 axis CNC control
    South bend lathe 10LX40
    K.O. Lee surface grinder 6X18
    Over 20 years as a Machinist Toolmaker
    A TWO CAR garage full of tools and a fridge full of beer
    Auto shades are for rookies
    www.KLStottlemyer.com

  3. #3

    Default

    Im building a mini dune buggy. I wanted to make the frame out of 4130 and all the mounts from mild steel. I was curious as to how the mounts will work since they arent the same type of metal.

  4. #4
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,889

  5. #5
    Join Date
    Dec 2007
    Location
    National City CA
    Posts
    1,086

    Default

    If in "mounts" you mean engine mounts, shock, axle, steering mounts. Sure I've done it for a few friends with buggies. Weld prep the heck out of them and burn them in. I've used a mig every time and that seems to be the best way.
    Just be sure your mounts are either prefabed (store bought) or are stout enough where needed. Overkill is a good thing in this aspect
    Miller Syncrowave 200 W/Radiator 1A & water cooled torch
    Millermatic 252 on the wish list
    Bridgeport Mill W/ 2 axis CNC control
    South bend lathe 10LX40
    K.O. Lee surface grinder 6X18
    Over 20 years as a Machinist Toolmaker
    A TWO CAR garage full of tools and a fridge full of beer
    Auto shades are for rookies
    www.KLStottlemyer.com

  6. #6
    Join Date
    Mar 2006
    Location
    Queens NY
    Posts
    1,547

    Default

    mild steel rod NOT chromoly rod, er70s2 or 6, do a search and you will find all the 4130 info you need.
    Dynasty 200 DX
    Millermatic 175
    Spectrum 375
    All kinds of Smith OA gear

  7. #7
    Join Date
    Dec 2007
    Location
    National City CA
    Posts
    1,086

    Default

    Quote Originally Posted by Laiky View Post
    mild steel rod NOT chromoly rod, er70s2 or 6, do a search and you will find all the 4130 info you need.
    What he said yeah yeah that's it. Guess I should have been more specific.
    Yes mild steel filler is fine for welding mild steel mounts to 4140 4130 tube
    Miller Syncrowave 200 W/Radiator 1A & water cooled torch
    Millermatic 252 on the wish list
    Bridgeport Mill W/ 2 axis CNC control
    South bend lathe 10LX40
    K.O. Lee surface grinder 6X18
    Over 20 years as a Machinist Toolmaker
    A TWO CAR garage full of tools and a fridge full of beer
    Auto shades are for rookies
    www.KLStottlemyer.com

  8. #8
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,889

    Default

    Quote Originally Posted by Laiky View Post
    mild steel rod NOT chromoly rod, er70s2 or 6, do a search and you will find all the 4130 info you need.
    That's the info in the Link I posted

  9. #9
    Join Date
    Mar 2008
    Location
    Torrance, Ca
    Posts
    83

    Default

    Actually I think the chromoly will crack before the mild steel. The moly is stronger but at the welded joint without pre and post heat can be verry brittle after welding. About 1/4" away from the weld will be the weakest spot. (assuming your using 1 1/2 tubing) Im sure theres alot of people on here that know much more about this than I do. Just my .o2
    Last edited by Blue Collar Moto; 03-29-2008 at 08:15 PM.
    Dynasty 200 DX
    Lincoln 140
    O/A
    Gradatim vincimus
    "We conquer by degrees."

  10. #10
    Join Date
    Dec 2007
    Location
    National City CA
    Posts
    1,086

    Default

    Yes this is true but on small pieces for what ever reason pre and post heat is not used and works fine. Is this to say that pre and post heating would not help?? No just that it almost makes no difference with the kind of loads these parts will see. and it just plain not practical to pre and post heat a buggy frame. lots of little flanges and pieces that need to be attached by the time you pre and post heated one part you could have had half of them done. This is also why a lot of the mounts are made from 5/16" 3/8" and up to 1/2" and bigger plate. once again OverKill but it get the job done.
    Miller Syncrowave 200 W/Radiator 1A & water cooled torch
    Millermatic 252 on the wish list
    Bridgeport Mill W/ 2 axis CNC control
    South bend lathe 10LX40
    K.O. Lee surface grinder 6X18
    Over 20 years as a Machinist Toolmaker
    A TWO CAR garage full of tools and a fridge full of beer
    Auto shades are for rookies
    www.KLStottlemyer.com

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Warning: Function split() is deprecated in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/footer.inc.php on line 82

Welding Projects

Special Offers: See the latest Miller deals and promotions.