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Old 04-30-2010, 12:06 PM
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Welding Chrome Moly Driveshaft

What welding technique is used to weld the end yokes onto a chrome moly driveshaft tube? I have 1350 series Spicer end yokes that I need to weld onto a chrome moly driveshaft tube. I am a good welder but do not have any experience with chrome moly.

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Old 04-30-2010, 02:18 PM
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I have always used TIG to weld 4130, and I have never seen anybody else do it any other way.
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Old 04-30-2010, 08:27 PM
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Yes, it has to be TIG(also known as HeliArc) welding, MIG or Stick is simple unacceptable and will break when using CM tubing..
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Old 04-30-2010, 08:33 PM
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Hi,
For the small price a drive shaft place charges, I'd
go there, as they balance it as well.
Rich
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Old 04-30-2010, 08:52 PM
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Actually any method of welding will work, some are just easier to control than others.. As far as the FAA is concerned oxy acetylene is the preferred method. The issues with welding chrome moly revolves not the method but how the heat effected zone "re crystallizes" when it cools. If care is taken to preheat before and stress relieve after, any welding technique is used will be fine. That said, my pref is gas, then tig but im an old airplane guy.

All in all do yourself a favor and take it to the driveline shop, you'll be money ahead. Ive been at this stuff along time and i still send out my drivelines
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Old 04-30-2010, 09:09 PM
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Tig it. The chances of you getting the ends in straight are pretty slim. If the ends are not in straight any D/L shop will need to cut the ends out and redue your work to get the shaft to balance out.

You might be ahead to take all your stuff to a D/L shop and have them do it for you.
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Old 10-13-2010, 08:06 PM
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Tig with s-2 wire, i'd start at 90amps and adjust from there. 1/16 tungsten and filler
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