Announcement

Collapse
No announcement yet.

Welding mild steel to chromoly?

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • 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
    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

    Comment


    • #3
      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.

      Comment


      • #4
        http://www.aws.org/wj/apr03/AWfeature.html


        Some info
        Ed Conley
        http://www.screamingbroccoli.net/
        MM252
        MM211
        Passport Plus w/Spool Gun
        TA185
        Miller 125c Plasma 120v
        O/A set
        SO 2020 Bender
        You can call me Bacchus

        Comment


        • #5
          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

          Comment


          • #6
            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

            Comment


            • #7
              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

              Comment


              • #8
                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
                Ed Conley
                http://www.screamingbroccoli.net/
                MM252
                MM211
                Passport Plus w/Spool Gun
                TA185
                Miller 125c Plasma 120v
                O/A set
                SO 2020 Bender
                You can call me Bacchus

                Comment


                • #9
                  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, 07:15 PM.
                  Dynasty 200 DX
                  Lincoln 140
                  O/A
                  Gradatim vincimus
                  "We conquer by degrees."

                  Comment


                  • #10
                    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

                    Comment


                    • #11
                      Originally posted by Broccoli1 View Post
                      Very good article! Thanks. I am always amazed at the amount of information available on the web. As the article points out, there is also a lot of mis-information. In closing, I wish I had the time to read all the good articles there are on welding. It would probably take a lifetime to just put a dent in them and then you wouldn't have the time to actually weld.

                      Comment

                      Working...
                      X