Pictures of a double hook that I welded together

I sorta agree. That center plate should be at least 50%-100% thicker. The welds look very good, though they are limited (according to the pictures) where the upper holes are.

Not sure if he destroyed any heat treat of the hooks, they dont look like they were softened very much by the smallish welds, though Id have done it while the hooks were partially underwater in a pot or tub.

As for never weld lifting accessories...that might be ok for a commercial interprise...for a private party...shrug

Gunner

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Not strong enough tor what?

You think I cannot lift 1,000 lbs with that?

Who cares about heat treat of the hooks. They are 5/16" hooks. I will use this to lift up to 1,000 lbs, it is far below any conceivable breaking limit of this assembly.

And the welds, I am sorry to say, are strong and substantial.

In fact, I bet that I could not break this assembly in a 12 ton press. (not counting the eye on the plate).

I will definitely use this for lifting.

Ignoramus26879 fired this volley in news:PqmdnaURM8K2s0HWnZ2dnUVZ snipped-for-privacy@giganews.com:

Yeah, Iggy, you probably can. But he's still correct.

The choice of rod/wire is critical. The workpiece (at the very least) needs to be re-heat treated to be considered safe. It should also be inspected (x-ray) for voids and inclusions.

But you'd be safe with 1000lb. Either hook alone could do that.

OTOH, why not just link two binder hooks together on a short length of chain to accomplish the same result, without introducing the potential for a weldment-induced failure?

This is your risk; so you evaluate it, and you accept or decline it at your own peril. I assume you're a moral person, and would not expose anyone else to the conditions you've accepted. So ---

It's OK, Ig. Just not good practice.

LLoyd

I used 7018 rod.

Exactly.

It is not exactly the same. I actually have a two binder assembly too.

I just put this hook to test in a 12 ton press. I turned it upside down, supported hooks by vertical plates thet were inside the hooks' openings, and pressed down in the middle between the hooks. While I am not sure what was the force, it was many tons and probably close to

2. The hooks did not detach from the plate and did not even budge.

The amount of weld is so far beyond any conceivable forces that the assembly will ever see, that it is completely safe. The weakest link in this assembly is the eye, not the hooks or the weld.

Ignoramus26879 fired this volley in news:XPadnQCck8zfokHWnZ2dnUVZ snipped-for-privacy@giganews.com:

Sure -- stressing a component to several times its rated load is the way to prove there are no gross defects (assuming you don't _induce_ a future failure ), and a low-hydrogen rod would be the right choice, since you don't know _exactly_ what the hook alloy is.

I don't think anybody here disapproves of your lifting something yourself for your own purposes with whatever you cobble up.

All the guy and I were saying is that it isn't acceptable "life safety practice" to do that sort of thing without metallurgy and inspection methods available.

LLoyd

While you will no doubt get lots of advice on welding and redoing the heat treatment of the hooks (if HF hooks are in fact heat treated), don't forget to proof test this to four times the intended max load.

Joe Gwinn

Sure. I am not about to start selling those hooks to the public, use them on oil platforms, or anything of the sort. This one will be used for getting odd shaped items from my pickup truck, where I want the chain to be of exact length I want and to not slip. I do not lift "overhead" either. I have no lifting equipment that could break this double hook assembly.

I just proof tested it in a 12 ton arbor press. See my another post. This was actually a good idea Joe.

Boy did you catch hell. I assume you know to never get under a lift. Nuff said.

Wes

And here is a reminder why not

I have seen many failed lifting hooks and accessories, and can think of at least half a dozen due to welding. The loads I have seen dropped due to bad welding range from about one tonne to 110 tonnes.

It looks like the welded hooks were G30 hook they may be more weldeable than G80 lifting gear. If you want to weld hooks to a plate, weldable hooks are readily available for the purpose, why not simply use the right item.

I can think of several people who never worked again as a result of poor lifting practices. If you are hand slinging you are too close for comfort if the chain or hook fails.

We have a service company inspect our hoists every year. So far no incidents. Still, I eyeball the situation before I perform a lift. Stuff happens.

I *always* operate on the concept that it is likely to fail. If the load needs stabilizing, I use a tag line so I can stay away from the thing in case it falls. I'm very squishy.

As far as Iggy, I'm fairly confident he understands physical properties well enough to know if his setup is safe for what he is doing. If nothing else we have reinforced that you don't get into the squish zone no matter how substantial your lifting setup appears to be.

Wes

Wes

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setup appears to

It is safe because what I am doing is far below the ultimate strength of this assembly. Thanks Wes.

They were G30 hooks.

I don't quite visualize how you used the arbor press, but another poster questioned if the 0.250" plate was thick enough, and the hook loop looked a bit thin to my eye.

I actually have no idea if the plate and loop are strong enough, but the most reliable test is to lift something using this fixture. Do this twice, with a fully asymmetrical load - full test load on the left hook, then full test load on the right hook.

You said that the max intended is 1000#, so the proof test load is 4000#.

This test is cruel. The point is to break it in test, if it's going to break at all.

Joe Gwinn

setup appears to

This site pretty well defines overhead lifting and the use of the proper equipment to do the job.

John