Galvanising parts already galvanised ?

[wookie]

Hi

I have some parts that are galvanised but I need to weld some bits to them, so after I've ground off the galv where I need to weld and done my welding I want to get them re-galvanised will this a problem ?

 

[eSCHEn]

No mate. Use paint on galv like galvafroid or arc-rite do a clone that's cheaper but still high Zn.

It's about twenty quid a litre but goes a long way.

Edit: looks like it's a bit more expensive than I remember http://www.ebay.co.uk/itm/151672438180 has the consistency of sticky poo in a blanket.

 

[Kent]

Ac whatever spray cold galvanising stuff. It's not so good as hot dip but to dip again they don't knock owt off you pay effectively double
Never sent nothing back don't know if they moan they do abutment stuff
Ac spray is available in silver or black. It's rated saltwater environment etc. Galvafroid is more for non dippable stuff than patch in

Once used ali paint on a job were we were welding pre- galve sheet fabrications for an egg firm. Many years ago don't know if ali paint is still available never used it since

 

[Wendelspanswick]

Hi

I have some parts that are galvanised but I need to weld some bits to them, so after I've ground off the galv where I need to weld and done my welding I want to get them re-galvanised will this a problem ?

If you make sure the bits you weld on are clean (rust free) then they will stick the item straight into the galvanising tank. They price the work by weighing the item before and after galvanising to calculate the amount of zinc used so it should be a fairly cheap job.

 

[overload]

If you make sure the bits you weld on are clean (rust free) then they will stick the item straight into the galvanising tank. They price the work by weighing the item before and after galvanising to calculate the amount of zinc used so it should be a fairly cheap job.

+ 1. Regalvanizing the parts won't be a problem.

 

[wookie]

If you make sure the bits you weld on are clean (rust free) then they will stick the item straight into the galvanising tank. They price the work by weighing the item before and after galvanising to calculate the amount of zinc used so it should be a fairly cheap job.

The bits I'm welding on will be clean, I just don't want to have to grind all the old galv off the rest before I send it for galvanising.

Thanks to eSCHEn for mentioning Galvafroid, I already know about that and have used it in the past, but in this case I'm already sending some big lumps to be galvanised so the extra cost for a couple of small bits is neither here nor there.

 

[Tigman]

the galvanisers i use do a minimum price so a small job costs dear

 

[gordon stephenson]

I have never had any galv done, but always understood price depended on the weight, Some posters are say it is weighed before and after the galv to determine the weight of zinc used, which is correct?

 

[Tigman]

They do go by weight but they do a minimum charge so if you send one bracket say , they will charge a minimum price , if you send ten brackets you get your moneys worth ! they also do a zinc surcharge !

 

[Welderpaul]

You pay by 'white weight' so it's weighed afterwards. It's a tonnage rate you pay. They don't weigh it first.

 

[Tigman]

they give me a price per kilo !

 

[CompoSimmonite]

Surely unless you have all the existing zinc stripped off prior to reglaving then dipping again will add another layer so in fact you will pay twice ?

 

[Wendelspanswick]

Surely unless you have all the existing zinc stripped off prior to reglaving then dipping again will add another layer so in fact you will pay twice ?

The heat melts the original coating and gravity sorts out the coating thickness when it's lifted from the tank.

 

[lincoln2013]

I bought some second hand driveway gates a few years ago altered them to fit my drive & had them re galvanized no problem

 

[steve t]

I didn't know you could redip stuff, sent beams of before that were to long for tank, they dipped one end ,turned them round and dipped the other the overlap in middle where they were double dipped was a black horrible mess.

 

[MattF]

I didn't know you could redip stuff, sent beams of before that were to long for tank, they dipped one end ,turned them round and dipped the other the overlap in middle where they were double dipped was a black horrible mess.

Any type of process where you usually have half in, half out tends to be never as good as full immersion. There'll always tend to be some iffy cross over spot which looks different.

 

[Ton-up]

I am making a new rear crossmember for my Land Rover 90 and was thinking about getting it galved. I would not want the chassis extensions dipped on the last 4" where I need to weld them to the existing chassis, (they are approx 12" long). Is this possible?
Anything I have had done in the past is fully immersed. I believe there is a layer of slag on the surface of the liquid?

 

[Mick Aumer]

Hot galvanising removes rust,wax,chalk but not paint markers! We send steel beams off to the galvanisers, the first time I wrote the customers
name with metal paint markers the steel came back with my writing perfectly legible no galv under the paint, oops!
May be you could paint the bits you want to remain bare.

 

[Peloquin]

We use IAE and Joseph Ash for galvanizing and they strip anything that's already been done before they dip/spin it again. The piece still needs pickling prior to dip to remove rust/scale etc so I'm assuming the pickling process effects the old galv.