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Welding dissimilar steels ? MIG

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Greg

07-11-2001 12:04:43




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Okay guys; here's my problem. I'm needing to weld up some pipe braces for a fellow for propping up bale-wagon stacks. Have 4130 tubing .133 wall to weld to a mild steel cross brace with a old harrow spike for a point that also needs to be welded to the mild steel also.
As this is a production job would like to be able to run wire and was thinking along the lines of Hobart HB-18 with either Co2 or a 75/25 mix ---Am I off base with this? What would you use or have used in the past that will work?

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Greg- Thanks Guys^^^^^^^nt

07-16-2001 05:41:06




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 Re: Welding dissimilar steels ? MIG in reply to Greg, 07-11-2001 12:04:43  



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Steve U.S. Alloys

07-12-2001 06:22:40




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 Re: Welding dissimilar steels ? MIG in reply to Greg, 07-11-2001 12:04:43  
When 4130 is allowed to air cool rapidly it will gain strength and hardness while losing some of its ductility. To restore ductility I would recommend using a dissimilar metals alloy. Sounds as if ductility may be a factor for extended service life of the part. Carbon content is low in the CrMo steels and the filler metal should have a lower C content for this application.

Chrome moly steels are subject to hydrogen induced cracking and the MIG process would be a good choice to aid in avoiding that condition. Joint design can also play a role in crack sensitivity. Sharp corners should be avoided and butt joints are recommended to avoid excess stresses in the HAZ. I don't which CrMo you have but a preheat should be utilized of 150°F to 250°F to also minimize residual stresses in sections under .5" thickness.

A dissimilar metal alloy would not be entirely necessary to join the spike (which I assume is hardened) to the soft carbon steel but it would have its obvious benefits.

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Ford Man

07-11-2001 13:35:46




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 Re: Welding dissimilar steels ? MIG in reply to Greg, 07-11-2001 12:04:43  
You should be able to weld it ok with mig and mild steel wire .

We welded a big assembly out of 2" thick 4140 plate using mig and mild steel wire .

The only caution that I would have is to look closely for cracks .

Good Luck !
Ford Man



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Branden

07-11-2001 13:14:45




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 Re: Welding dissimilar steels ? MIG in reply to Greg, 07-11-2001 12:04:43  
Do I understand you want to weld aluminum to mild steel? This cannot be done. Aluminum can only be welded to alulminum. Mild steel can be welded to a variety of different steels of different carbon content and chemical makeup, but NOT aluminum. You will only be able to bolt this project of yours.

Branden



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Al English

07-11-2001 15:00:36




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 Re: Re: Welding dissimilar steels ? MIG in reply to Branden, 07-11-2001 13:14:45  
Hi Branden,
To quote a friend of mine "I can weld aluminum to steel, but I have to be going about 100 MPH". What he is referring to is a piston seizing in its bore. Although the aluminum that is deposited on the cylinder walls and sometimes the cylinder head when this happens is not truly welded on, you would think so if you had to remove it. The only fast and thorough way of removing it is with acid.

By the way, 4130 is a chrome-moly steel alloy, not aluminum.

As Ford man said, watch for cracks. Pre-heating, and keeping the welding heat on the low side, will help. Good luck...Al English

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Branden

07-11-2001 15:11:45




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 Re: Re: Re: Welding dissimilar steels ? MIG in reply to Al English, 07-11-2001 15:00:36  
Ahhh, you are correct. I was caught off gaurd by the "dissimilar metals" heading. Yes, you can weld 4130 to mild steel.

I've had 5 and 7 series aluminum on the brain the past couple of days, and assumed it was a 4 series aluminum. I was thinking of 4043.... Thanks for catching my error.

Branden



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