Do I risk using this Engine Crane

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Originally Posted by DoubleChevron

Iv'e had one of those cheap cranes for years.... I've never seen one with a welding job like that. You really need to contact upper management at supercheap. that's things a lawcase waiting to hapen :eek: You know, all the others may have been welded ok. You might have got unlucky.

seeya,
Shane L.

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The one on display was welded just as badly. To try to prevent someone getting hurt or worse, I will attempt to contact the vendor's management. Not holding my breath though.

I came across this ex TAFE eigine crane sale this morning.



Heavy duty engine crane, IEL, manual hydraulic action, jib extendable jib, Auction (0218-5007799) | GraysOnline Australia




Erich

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Originally Posted by Mr Whippy

The word "She" probably has a lot to do with why the person did not understand a good and bad weld.

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Gender has nothing to do with metallurgy or the ability to lay or read bead. Two of the best welders in one of my Tafe classes were women.

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Originally Posted by flagg

Gender has nothing to do with metallurgy or the ability to lay or read bead. Two of the best welders in one of my Tafe classes were women.

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I know that gender has nothing to do with it but, I reckon if I went to my local pub on a busy night with a photo of the weld in question, that 50% of the males there would have a pretty accurate opinion of the weld. Not many of the females would.

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Originally Posted by Mr Whippy

I know that gender has nothing to do with it but, I reckon if I went to my local pub on a busy night with a photo of the weld in question, that 50% of the males there would have a pretty accurate opinion of the weld. Not many of the females would.

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Maybe so, but try the same trick at any place not dominated by tradies, and see how you go. Betcha your primary school teacher, insurance salesman, delivery driver, bookshop owner, barista etc wouldn't have a clue about welding. I should know, these guys are my customers and most of them don't have a foggiest about mechanical stuff. That's why I'm still in business, clueless guys.;)

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Originally Posted by Milton477

All the welds are under stress

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How much stress? Show us your calcs?

There are two ways to ensure something is safe.
1. Test it.
2. Analyse it.

My supercheap engine crane has no problems swinging my 4BD1T at max extension. Welds look much the same as yours. No distortion from all the times it has been used.

Therefore it's passed the ultimate test.

To put some numbers to the "weld stress".
1250kg in tension or shear can be supported without problems by 61 square millimetres of weld.
Even if the weld was only getting 1mm penetration, you've got 280 square mm around each joint of the 70mmx3 SHS.

These same cranes are sold worldwide under a lot of different colours and brands.

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Originally Posted by Milton477

Anyway, I ground out some of the worst welds & re-welded.

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This weld of yours:
http://www.aulro.com/afvb/attachment...41-medium-.jpg

Is good.

This weld of yours:
http://www.aulro.com/afvb/attachment...56-medium-.jpg

Is not. You've missed and created undercut instead of a smooth fillet.
But this part is in compression in use anyway. The weld does virtually nothing.

hmmm
1250 eh
Maybe they rate it as such as it will probably lift the 300 pr so you are most likelybgoing to lift just fine ;)

1250 is one heavy donk!

Those welds sure look shizzle but i can almost guarantee you no engineer would ever put their name to a folding jib crane made from rhs with a swl of 12500N. ....


Buy junk accept junk, or just dont buy junk

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Originally Posted by roverrescue

hmmm
1250 eh
Maybe they rate it as such as it will probably lift the 300 pr so you are most likelybgoing to lift just fine ;)

1250 is one heavy donk!

Those welds sure look shizzle but i can almost guarantee you no engineer would ever put their name to a folding jib crane made from rhs with a swl of 12500N. ....


Buy junk accept junk, or just dont buy junk

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The 1250kg is right in close. As you extend the boom, the capacity reduces as marked.
At full extension they are marked "500kg" and have no problem lifting out a 4BD1T.

http://www.aulro.com/afvb/attachment...1&d=1380169923

To fit the legal definition of a crane in NZ (Aus standard is likely the same) and be engineer certified it must have two powered axis. These don't.