Welding Strength

[renewablejohn]

Obviously both jaws were originally parallel to each other the bottom jaw has cracked and sheared off with only the weld keeping it attached together with the connecting pin which is now holding the bottom jaw on.

[cornish wood burner]

Sounds like I have been very lucky. I presume with hindsight the drawbar jaw should have been bolted rather than welded. Cannot understand why the engineering co would weld if they new it was heat treated. Having trouble finding a replacement jaw that will handle 10 tonnes most of the ones I have found are rated 5 tonnes and below. Any suggestions

 

I would drop it back in their lap. If they took on the job then they should do it properly.

 

Whether heat treated or not I would expect the drawbar to be a highish strength steel of some kind so welding would cause a weak point at best. As a matter of interest was the broken weld normal steel grey or silver stainless colour? High strength welds normally are the latter due to the more exotic metals in them.

 

If I had taken on that job I would have needed to know what you were pulling, the terrain it was to be used on and the drawbar vertical weight. Did they know or ask this?

[Mortimer Firewood]

Are you meaning in steel erecting etc? If so mma is favoured because of its advantage in working in the elements, all the components will have been mig welded where poss before assembly, some metals like cast iron are welded mma because the wire would be unusable in mig, other than that mig trumps mma in most things, the wire can be flux of metal powder cored for specialist applications, the only thing better for heavy fans is submerged arc welding but that can only be done on v butt welds not much good for fillets

 

Yes steel erection. When I was on Saint David's two shopping centre in Cardiff the beams supporting the whole structure were bought in in 15 m lengths 18 tonnes then two welded together with the v butt section you mentioned. I thought the welder was joking when he said each weld would take two weeks to complete there was 30 to do.

[Richard 1234]

Yes steel erection. When I was on Saint David's two shopping centre in Cardiff the beams supporting the whole structure were bought in in 15 m lengths 18 tonnes then two welded together with the v butt section you mentioned. I thought the welder was joking when he said each weld would take two weeks to complete there was 30 to do.

 

 

That's a lot of welding per joint, I can't weld so no idea but how come it took so long? Obviously it had to be strong but that seems an awful long time to weld!!

[renewablejohn]

I would drop it back in their lap. If they took on the job then they should do it properly.

 

Whether heat treated or not I would expect the drawbar to be a highish strength steel of some kind so welding would cause a weak point at best. As a matter of interest was the broken weld normal steel grey or silver stainless colour? High strength welds normally are the latter due to the more exotic metals in them.

 

If I had taken on that job I would have needed to know what you were pulling, the terrain it was to be used on and the drawbar vertical weight. Did they know or ask this?

 

All the other bits that have dropped off the tractor are due to the welds breaking but the drawbar weld is still intact the jaw has sheared directly above the weld.

The engineering co was fully aware it was being a forwarding tractor and even the specific trailer it would be pulling.

I will put it back in there lap and see what the reaction is.

[aspenarb]

A couple of things, Maximum drawbar weight should not really exceed 3 tons and can the trailer drawbar ring swivel or is it just welded solid onto the drawbar?

 

Bob

[Hodge]

Dread to think what would happen if forwarding trailer hit the deck at 20mph as all pipework and valve block would still be attached to the tractor.

 

 

Not for long they wouldn't;)

[WeFixIt]

We sell these If this what your looking for?

 

Tow Hitch NATO Style 15000kg Capacity [Mounted via 4 x 12mm bolt holes. Hole spacings 45mm x 85mm centres (HxW). Pintle hook. Comes with removable lock pin and chain. Black finish. vertical load750Kg Fits 3584 and ring hitches. ]4.71 KG

[Treewolf]

That looks more like a 5 tonne pintle, not 15 !

 

15 tonnes on four M12 bolts? Aer you sure?

 

Also with a fixed pintle you can only tow trailers with a rotating lunette.

[renewablejohn]

A couple of things, Maximum drawbar weight should not really exceed 3 tons and can the trailer drawbar ring swivel or is it just welded solid onto the drawbar?

 

Bob

 

Its a Kesla 9T forwarding trailer with swivel ring. I doubt whether the drawbar weight will be that high but the crane will weigh quite a bit and its within 1 mtr of the drawbar hitch.