welding hydraulic cylinders

biggerred · Jan 8, 2016

Is it possible to weld onto the body
(the "can" so to speak) of a hydraulic
cylinder without damaging the cylinder?

Dalex · Jan 8, 2016

Sure , but you need to disassemble it and get every speck of oil out of it .Any oil will burn and leave a bit of carbon , which will leak . I worked for a Case dealer where we did several....

Mike(NEOhio) · Jan 8, 2016

I think welding would distort the bore and possibly change the hardness in that area. Might be possible to re-hone it, though.

Andy Martin · Jan 8, 2016

Typically welding is done at the ends, away from the piston travel. What did you have in mind for welding? If an additional nozzle, good fitup and proper welding technique will help avoid distortion. I've got a buddy that makes large hydraulic cylinders, they machine the cylinders, send them out for honing, then weld and hydrotest. Of course they know what the steel is and have an appropriate welding procedure.

f2355j · Jan 8, 2016

Years ago I had a cylinder with a crack in the tube length wise and thot I'd just "weld er up" Well the first attempt didn't work so I thot "Ill try again" After about three times and maybe 5# of rod I thru it into the scrap pile. So it depends on what type weld you need and if you know what you are doing, I obviously didn't and still don't so you wont see me trying it.

unc · Jan 8, 2016

Hydraulic cylinder tubing is made to be welded. The carbon content is .3% or lower. Use nice fresh new 7018 ( not the open box from the auction!). If multiple passes are needed, do the root with 6010 or 6011. Use a little preheat (300-400F), and let it cool gently in still air, or wrap it in ceramic insulation. Distortion depends on where the weld is. Something like a trunnion mount cylinder will need honing, where welding on either end, or adding a threadolet may not. If in doubt, get a pro to do the job.]

KCTractors · Jan 8, 2016

We welded all kinds of cylinders in the logging business. A welder welded the main cylinder rod back to the "T" without even taking it off the machine. AS far as I know it's still holding.

Geo-TH,In · Jan 8, 2016

I had a crack on the end of my hydraulic cylinder. Took it to the hyd shop, they welded it for me for free. Think about it all ends are welded. Might be another story if you plan to weld at places there than the end.

jon f mn · Jan 8, 2016

Welding the ends is ok, but along the barrel could shrink or distort it.

Moonlite37 · Jan 8, 2016

I had an old Midwest loader and the cylinders were pitted in the lower end from water gathering there. I cut the bottom off and reversed the tube, I welded it back with 6013 with no pores

JOB · Jan 8, 2016

I agree with jon f mn I have clamped to a barrel, But I wont weld.

T.R.K. · Jan 8, 2016

I used to work for an OEM that occasionally would order a cylinder with the ports oriented wrong for the application. They would just cut the fixed pin lugs off, pull the piston to the other end of the cylinder and mig weld the lugs back on in the correct orientation with the ports. Never had a problem or failure that I knew of.

welding hydraulic cylinders

biggerred

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Dalex

Well-known Member

Mike(NEOhio)

Well-known Member

Andy Martin

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f2355j

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unc

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KCTractors

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Geo-TH,In

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jon f mn

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Moonlite37

Well-known Member

JOB

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T.R.K.

Well-known Member

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