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21st May 2015, 03:48 PM #16
I think the failure had more to do with the fitness of purpose of the tool for the job than the quality of the Chinese welder.
It is all to easy to jump on the bandwagon, but the hoist wasn't ever designed for this.The stress points are different.
If the hoist were to be subjected to the same test again and the stress measured ,I am sure it figure would be well in excess of the 2 tonne max the lifting arm. The weld would be Ok ,but I suggest the arm bracket or the cylinder rod itself would bend or tear.
Grahame
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23rd May 2015, 03:41 PM #17
In this case it might be a combination of both factors.
I retrieved the short section of RHS I cut off the job from the bin and had a good look at it. On the wall section that gave way 1st there is no sign of any weld filler metal at all - it looks like a cut section. On one of the adjoining walls there is no sign of fusion for a third of the length of the wall with 3/4 to full penetration for the remaining 2/3rds. The other adjoining wall has half depth penetration for the full length of the wall. I can't comment on the 4th wall (the one that was hanging on) as I had to cut it off with the 9" grinder.
So it does look like the factory welding could have been better.
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23rd May 2015, 04:13 PM #18Golden Member
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Yeah, I guess that's the edge that's visible in the original photo - plain as day.
It's all too easy to say that it was used wrongly or it was cheap, or came from some generic cheapo nameless wholesaler so it was it be expected - but it is not acceptable. Despite it not being used in the way intended, there is no excuse for production welds like this - if a weld looks strong it should be strong. Any weld that is on any lifting equipment should be as strong as possible given the base materials. To run a bit of metal around the outside and call it good is at the complete opposite of the spectrum to what I'd be happy with.
- Mick
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24th May 2015, 03:30 PM #19Most Valued Member
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24th May 2015, 05:59 PM #20
Ok the welding is not we would care to be personally responsible for,but the operator is probably just doing what he is told to do. Given the state of the welding it is likely that he has little or no training.
Given the numbers of these units about the country, if there is typical poor quality welding where are the reports of the failures as logically there would be likely to be more than a few.
While we are there what about the quality of the chain ( some have short chains) and the lifting hook, the pins and the wheels for that matter,all areas for potential failure.
Like many other cheap tools purchased we might expect to do some fettling on them to make safe and fit for purpose.
If skilled at such work they are easy to damage
Grahame
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24th May 2015, 07:27 PM #21
I have noted already that the failure did occur doing an operation that the unit wasn't technically designed for. Previous to this it was used to lift a very heavy jointer and it did the job well. This would have been very similar to lifting an engine with the weight and loading being centrally located to the lifting arm.
Sorry I can't agree with this. If something is put on the market needs to be safe and fit for purpose. If it needs work by the purchaser to satisfy either of these, then it should be sold as a kit requiring assembly.
To reiterate again this engine crane was fit for intended purpose, was safe when being used for intended purpose - but did contain some fairly poor quality welding and certainly looked better than it really was.If you don't talk to your cat about catnip ...... who will?
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24th May 2015, 08:19 PM #22Most Valued Member
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How many times do we see kids toys, recalled because of inadequacies, small plastic components, plastic that shatters when dropped. etc.
Cars being recalled because of some component failure, electrical goods with faulty wiring, causing the loss of homes and life.
Shoddy workmanship seems to be a way of life, with imported products. Gone are the days when you bought something, that you could pass it on to your grandson. A lot of stuff has a lifetime warranty, of the product that is.
Life means nothing now days, murder someone, and get 5 years what a joke.
Just my views.
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1st Jun 2015, 04:15 PM #23Most Valued Member
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ah ah....now I know where to go if I need some decent welding done.....
(Yes I do have a welder but like most wannabees I cant weld for peanuts...well sometimes it works and looks presentable)
isnt it great that you had plenty of offers of help Stinky?
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