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Thread: Bend Tester
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3rd Jun 2020, 10:19 PM #1Novice
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Bend Tester
Evening all,
I am after a wraparound bend tester that will handle 13 mm thick material, 50 mm wide and pull a 180 degree bend around a former 35 to 65 mm dia. Making the formers is easy enough, but trying to find a bend machine that will cope with the 13 mm thickness that is not hydraulic or very expensive to ship international is a challenge. Before I look to make one is there anybody out there who may be able to recommend an off the shelf one?
I'd like to avoid the plunger types because they tend to get stuck or don't bend evenly - especially on Aluminium where the HAZ tends to be soft...
Something like the No 2 machine from Hossfeld would be excellent - but without the USD$3000 to freight it please....
https://www.youtube.com/results?sear...=hossfeld+no+2
Thanks & regards to all, Leaner.Last edited by Leaner; 4th Jun 2020 at 01:14 PM. Reason: Spelling
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4th Jun 2020, 09:48 AM #2Most Valued Member
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If we knew where you were it would be a LOT easier, PLEASE change your location to a state, town, suburb and city to help you.
To grow old is mandatory, growing up is optional.
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4th Jun 2020, 10:47 AM #3
Hi Leaner,
First up welcome to the Metalwork forum
What you have posted suggests that you may be undertaking some welders certification weld self practice testing.
Are you referring to steel or aluminium test samples. If the samples are 50 x 13mm (2" x1/2") steel I would say ,it is not possible with a Hossfeld type bender.
Hossfeld specs say 75 x 6mm (3"x 1/4") max capacity for flat.I am not even convinced that the hossfeld or a clone could bend 50x 13mm aluminium as well.It still is pretty hefty, even in aluminium.
It is difficult to assist you based on minimal information given. If you can, give more details about your situation what you are trying to achieve. It is entirely possible someone's done it before and can help if they have an understanding more about where you are coming from and what want to achieve.
Please change your profile to remove tghe Global Explorer location. It doesn't help you and it certainly doesn't help our Forum members to help you.We don't want a street and house number but a suburb can very handy.
We ask members to give a location because often times it works out that one can have a Forum member living close by.
This means there is, potentially, a member who could offer knowledge, assistance, or something as simple as where to purchase / find engineering metalwork items ,you may have had difficulty in locating.
Feel free to head over to the Welcome wagon and tell us about yourself re metalworking and I will post a proper welcome message over there.
Please goto the top LH of the page Click of the FORUM box and Forum Home will appear on the top of a pulldown list.The Welcome wagon page is about 6 titles down. See ya there.
Welcome again
Grahame
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4th Jun 2020, 01:21 PM #4Novice
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Thanks for your replies Gents,
I wrote to Hossfeld to ask if their Machine No 2 can pull a 180 degree bend using 50 X 13 mm flat around a Dia 50 mm former. Admittedly for ornamental work around the pin it says 1/4" [I missed that bit earlier] but for a 50 mm former it may cope better especially if I mount a ball or roller bearing instead of a solid former. They may also recommend the hydraulic attachment rather than grunting it out and slipping...?
It is for a test situation and I don't want to use the plunger types, they bend funny till the sample is effectively stamped into the female dye at which point it is pressed into its correct shape. A good wrap around machine will be more uniform in its application of stress which is fairer on the welder trying pass his test.
L.
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4th Jun 2020, 04:22 PM #5Novice
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You guys might be right...It is a big ask to pull 50 mm X 13 mm through 180 Degrees without something pretty grunty.
https://www.youtube.com/watch?v=_Rur3UCgUIs
I'll see what recommendation Hossfeld come back with. Might have to drop my 50 mm to 40 mm and see how that feels with a long bar and two roller bearings...??
In the meantime I have decided to try and make one of these myself - first question, from what type of steel?
I'm figuring on 50 mm or 60 mm X 16 mm flat, ideally not a mild steel; something a little stronger but something I can still weld that is commercially available at the local steel shop....?
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4th Jun 2020, 08:58 PM #6Most Valued Member
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Has anyone else noticed that we are dealing with a poster who is wanting to build a weld test rig, but is talking about non standard material sections and appears based upon his comments to have little to no experience of weld testing.
The test rig we used for AS1796 testing was a 10 ton enerpac porta power with appropriate size formers pressing between two appropriately spaced round bars and there was no issue with improper bending.
I think the OP needs to give us the full story ajnd his location before we can do much more.
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4th Jun 2020, 09:11 PM #7Novice
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This is why I don't disclose my location, read gaslighting, invalidation, then read Linnert Vol 2. What exactly is nonstandard, can you advise further...?
Will look to AISI 1045 - a little stronger than mild steel yet still easily weldable and available from the local steel merchant.
A very quick google search under Bend testing Aluminium brings up advice from ESAB "The plunger-type guided bend test is not recommended for testing aluminum. The heat affected zones of welds in aluminum alloys, and particularly in the heat...
https://www.esabna.com/us/en/educati...base-alloy.cfm
Were you NATA registered? I used to Audit for a NATA type organisation.
And if you want to dig a bit deeper try Carl Jung's shadow.
And now for a little light relief, why don't you try this out on the workshop stereo... https://www.youtube.com/watch?v=ED9e...&start_radio=1
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4th Jun 2020, 11:03 PM #8Novice
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The good people at Hossfeld have responded and say steel 1/2 thick by 2" wide through 180 is possible all be it a bit of a grunt manually. Hydraulic not a problem.
Mmmm time to upsize the frame.
Nice to have my machine hacked too by the way.
L.
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30th Dec 2021, 07:40 AM #9Novice
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https://www.youtube.com/watch?v=QWwmXm8x5n4
See at 8:33, 8:36 and 8:37 exactly, the bends are uneven, less bending in the weld, more in the base material. I wonder how many weld tests have "passed" with bend results looking like that in your world? Fibre elongation is supposed to be even around the bend, accross the whole width of the weld zone to test for ductility in the weld, as this is what a bend test tests for. No point in having an uneven bend diameter in the bend zone because you then have no idea what elongation the weld zone has been subjected to.
Of course a wrap around bender [with proper sample preperation] would solve that. As would pressing it into a form but for the problem I discussed earlier.
Lesson learnt; get yourself a wrap around bend tester if you want to do the job properly, make sure it can accomodate 1/2" thick test specimens and make the thing take as wide a material sample as possible so you can use it for other purposes other than weld testing.
All the very best to one and all, L.
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