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Old June 8th, 2012, 01:30 PM   #1
SteelTherapy
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Default Welding Chrome Moly

Is it possible to use a Flux core wire feed welder to weld Chrome Moly steel to hot rolled steel? If so, anything special techniques or considerations required?

If not, what is the preferred welding technique?

Thanks in advance.
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Old June 8th, 2012, 02:42 PM   #2
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In general yes. The big thing with Chrome moly is pre heat and post heat.
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Old June 8th, 2012, 03:02 PM   #3
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Tig welding chromoly I have user er70 with no preheat. After it has cooled completely I heat to around 1200 degrees, the thicker the material the longer I keep it hot. Let it cool after that and you are good to go. If you don't normalize it after you weld it will be brittle.
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Old June 11th, 2012, 04:26 AM   #4
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Quote:
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In general yes. The big thing with Chrome moly is pre heat and post heat.
With pre and post heat, will a MAP gas torch be good enough?
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Old June 11th, 2012, 04:35 AM   #5
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Quote:
Originally Posted by SteelTherapy View Post
With pre and post heat, will a MAP gas torch be good enough?
Depends on the thickness of the material being welded.
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Old June 11th, 2012, 06:01 AM   #6
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With pre and post heat, will a MAP gas torch be good enough?
Imo no it isn't. Letting it cool completely then reheating is very important. As it cools it will have uneven stresses throughout the weld. You have to get it hot enough to relieve the stress which is around 1200 degrees. You will never get that with a map gas torch. It doesn't need to be done immediatly just before you put the weld into use. You can weld it up and bring it to someone's house that has a real torch.
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Old June 11th, 2012, 06:01 AM   #7
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Get a 1200 degree heat stick to check it.
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Old June 11th, 2012, 06:12 AM   #8
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It's a spindle for a swingout tire carrier. It is 1.5" in diameter. Since this is the only chrome-moly part perhaps it would be better to just have someone weld it for me.

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Old June 11th, 2012, 08:03 AM   #9
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If it was me I would have someone tig it. Not to say MIG won't work but tig will be better.
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