What NOT to do when Hydroforming

What happens when you don't let the trapped air escape during Hydroforming. I did this deliberately as a demonstration, which may be helpful to those who want to try the process and want to avoid a 'rapid pressure release'.
More projects: www.connorholland.com/
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#hydroforming #metalwork #fail

[@ConnorHolland]

Did you spot the deliberate mistake? Always make sure there is no air left trapped inside the piece, which compresses and results in a more violent rupture. Usually there is no air inside, and the water pressure is released by a much less dramatic pinhole leak, as seen on my other videos

[@kalleklp7291]

That's the exact reason why pressure vessels are tested with water. A gas can be compressed and act like a bomb in an enclosure, a liquid will only compress by a tiny fraction and as soon as there is one small leak the pressure drops instantly.

[@custos3249]

Might be able to turn that into an instrument like a tongue drum

[@HHOGAS]

As you can see in this demonstration it appears the extreme pressure heated up the water inside according to the fumes coming off the end at the end of the demonstration. Did you check the temperature of the water?

[@ConnorHolland]

Its was the rapid release of pressure that caused the cloud of water vapor

[@edwhatshisname3562]

That sounded a bit like a gunshot. Also, it looks like you made a steel drum at the end.

[@neatmachine]

Since you only have the high pressure inlet pipe for access to the interior, how do you make sure you get the air out? Do you prefill the form with as much water as possible before attaching the pressure washer? It would seem so.

[@ConnorHolland]

I usually keep the hose only loosely attached to the pressure washer while filling up, so all the air escapes. Ideally I should add a bleed valve where the hose connects to the workpiece

[@danielstig2536]

A qué presion explota ?

[@gcl2783]

Never hydroform with hot water? One fewer method for making tea.

[@quillclock]

seems like the dimples gave it way more strength too. interesting.

[@user-kq8os5jq1t]

squeeze complex stamps with water, art)

[@schwarzerritter5724]

Don't hydroform from a safe distance?

[@OrtexVideos]

What gauge steel do you typically use?

[@ConnorHolland]

1mm usually, this one is made with 0.8mm

[@OrtexVideos]

@@ConnorHolland Awesome thanks! What is the thickest you have done?

[@ConnorHolland]

@@OrtexVideos 2mm, but I found the thinner sheet is still plenty strong enough once inflated for my purposes, and cheaper

[@09jt1]

Well, it have its own beauty 😅

[@klab3929]

Only Reason why it made a bang was because there was air inside or vapor pressure from boiling water, fully water that bang wouldnt happen

[@MrRulz-oc1pv]

cowbell

[@stevehislop]

From my experience as a hydroforming engineer, the trapped air is not an issue at all. The trapped air will dissolve into the water according to the mollier-diagram and its describing wet/steam relation.

[@ConnorHolland]

Probably because it is contained within a heavy duty steel mold during industrial hydroforming. In this DIY process trapped air will cause a violent rupture, instead of a small leak with just water

[@rock7282]

Behind the glass door lol sry but