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Can one weld a broken hydraulic cylinder shaft?

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Leon

04-01-2000 20:33:58

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I have a hydraulic cylinder from an engine lift that got broken off at the end. By that, I mean that the shiny shaft snapped off right before the connection yoke at the end.

So- is it possible and safe to attempt to repair this? I just got my Millermatic 250 MIG welder, so I have the machine for the job. I wonder about messing up the seals in the cylinder from the heat.

In case you are wondering how in the world I managed to break off a 1" hydraulic cylinder shaft, it happened when I brought this homemade thing to my farm after purchasing. Hard to explain, but suffice that a 10' long arm swinging was enough leverage to snap off the 1" hydraulic actuator.

I figure I can just replace the cylinder fairly cheaply, but I just got this great welder...

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mehdi

12-28-2000 15:50:41

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Re: Can one weld a broken hydraulic cylinder shaft? in reply to Leon, 04-01-2000 20:33:58

please give me information

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saleh tarish

12-25-2001 11:53:06

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Re: Re: Can one weld a broken hydraulic cylinder shaft? in reply to mehdi, 12-28-2000 15:50:41

Yes we can if we have the right welding rod and cooling system to avoid shaft bending

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Taylor Lambert

06-10-2000 14:05:31

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Re: Can one weld a broken hydraulic cylinder shaft? in reply to Leon, 04-01-2000 20:33:58

I work in a Hydraulics shop, I weld the ends on cylinders all the time, and make new ones as well, welding hapens to them after the rod ist heat treated, so any welding is the same nearly.
A few important things is to extend the rod and put vaseline or tip grease on the chromed rod, keeps the spatter off the seals, another thing is to put ground clamp on the connectors eye rather than the rod, anyy ac that may occur will blemish the rod.

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GET A NEW ONE,save yourself........

04-03-2000 18:39:39

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Re: Can one weld a broken hydraulic cylinder shaft? in reply to Leon, 04-01-2000 20:33:58

a lot of head aches.As well as potential danger,from future breaking.Yokes can sometimes be welded(at some loss of strength)but the rod itself is never up to par.It would be cheaper in the long run to buy a new cylinder.Buy some scrap metal to try your new welder on. Good luck.

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04-03-2000 16:05:38

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Re: Can one weld a broken hydraulic cylinder shaft? in reply to Leon, 04-01-2000 20:33:58

Leon,
Get yourself a spool of Lincoln 71M Flux -cor gas shielded wire or its equivelant.NOT SELF SHIELDING Flux-cor. This is what most fabricating shops use for structural steel and equipment manufacturing. If it is not being done automatically it is probably being done with this process. Solid mig wire does not have the ductility that flux-cor or a stick 7018 will have.
This is all assuming you are not welding on the chrome,pull the ram out getting it away from the seals.

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john d

04-03-2000 13:54:30

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Re: Can one weld a broken hydraulic cylinder shaft? in reply to Leon, 04-01-2000 20:33:58

The other posts seem to have the welding procedure pretty well covered. I broke one once and got away with a little creative machining on the end of the ram and re-installed it into the yoke. Cylinder's slightly shorter at full extension, but it works!

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Steve U.S. Alloys

04-03-2000 07:22:31

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Re: Can one weld a broken hydraulic cylinder shaft? in reply to Leon, 04-01-2000 20:33:58

Hi Leon,
I've had lots of customers that welded the yokes back on the ram using something like our 2200 with a 120,000 PSI tensile and affinity to dissimilar metals. The deposit is also rust proof. The stud idea works good especially on conveyor screws or large castings but is not necessary if using the proper filler material. With cylinder rams, a weld made with a wire like you have in your MIG ( I assume E70s-6 or -3) will not hold long term without something like that stud. Also the bead will lead to rust that will be detrimental to the life of the packing seals. The heat will destroy them in any case if the ram cannot be extended out far enough. You may also want to consider a heat fence or heat sink material.
Steve

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Fred

04-03-2000 08:45:11

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Re: Re: Can one weld a broken hydraulic cylinder shaft? in reply to Steve U.S. Alloys, 04-03-2000 07:22:31

I consider the mig welder as a production tool for factories and fab shops. Pretty good for sheet metal too. The reason they became popular is their ease of use. Unskilled laborer can learn to run one of them. I prefer a TIG welder for repair work, it's more versatile to me.
The yoke on the cylinder can be repaired by taking the shaft out and covering the finished surface with anti-spatter compound so weld won't stick to it and ruin the seal. Ground clamp should go on other end of shaft. Put pieces in alignment and weld a half inch on one side. Then take torch and vee out other side half way through and weld as Steve suggested. Then, vee out the side where you ran the half inch bead and weld it. This gives you good alignment between the two parts. It should then be put in a lathe and turned down and polished IF the seal will ride over it.

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04-02-2000 05:25:52

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Re: Can one weld a broken hydraulic cylinder shaft? in reply to Leon, 04-01-2000 20:33:58

It can be done. Just don't put the ground clamp on the shaft. The arcing will cause a pit and then the cylinder will leak.

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mehdi

12-28-2000 15:49:08

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Re: Re: Can one weld a broken hydraulic cylinder shaft? in reply to Ed, 04-02-2000 05:25:52

please give me information

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Dick L

04-02-2000 08:32:34

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Re: Re: Can one weld a broken hydraulic cylinder shaft? in reply to Ed, 04-02-2000 05:25:52

I have welded several over the years to keep production machines running untill new parts could be shipped in and some times it would last for years. I always drilled and taped both parts in a lathe on center, screwed a hardened stud at least 3/4 the size of the rod, tapered both parts within 1/8" of the stud and welded in a gig made of angle iron.
The gig would consist of one longer piece with two shorted pieces layed on top of the longer piece allowing a gap where you are welding. Build the weld ( 7018 ) high enough and turning back down in the lathe and polish with a file a emery cloth. The main holding power is in the stud not the weld.

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Michael p

04-02-2000 19:52:52

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Re: Re: Re: Can one weld a broken hydraulic cylinder shaft? in reply to Dick L, 04-02-2000 08:32:34

Great idea,using a stud,that should last a very long time.Its good to hear about jobs that were really done,and worked,thanks.

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