Special prep for zinc coated metal?

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TerryG
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Special prep for zinc coated metal?

#1 Post by TerryG » Tue Mar 08, 2016 2:59 pm

I have a pair of new "headlamp boxes" to weld on to my RR but rather than the normal black primer, they have arrived zinc coated.
Do I need to do anything more than key, etch prime, prime and paint?
Understeer: when you hit the wall with the front of the car.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.

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JPB
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Re: Special prep for zinc coated metal?

#2 Post by JPB » Tue Mar 08, 2016 6:08 pm

You must remove some zinc prior to welding and even then, make sure that you wear a suitable mask to avoid breathing in the vapour that you can't avoid releasing with the heat. If you're attaching these pieces with a seam, allow a good half Inch of bare steel behind the weld, if you're spot or plug welding, then allow a similar distance as a radius around each spot.
Apply some weld through primer to the bare edges and overlap the remaining zinc, otherwise, the coating will corrode away quickly and leave the steel unprotected. For this reason, it's also advisable to use Galvafroid - ideally when the steel is still hot from welding - on areas where some surface is bare and some still Galvanised.
J
"Home is where you park it", so the saying goes. That may yet come true.. :oops:

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TerryG
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Re: Special prep for zinc coated metal?

#3 Post by TerryG » Tue Mar 08, 2016 10:26 pm

I knew there was a reason we kept you around John ;)
Cheers for the advice.
Understeer: when you hit the wall with the front of the car.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.

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JPB
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Re: Special prep for zinc coated metal?

#4 Post by JPB » Tue Mar 08, 2016 10:48 pm

TerryG wrote:I knew there was a reason we kept you around John ;)
:lol:
TerryG wrote:Cheers for the advice.
You're welcome. Please post lots of detailed images to illustrate your latest round of Man vs Range Rover. :thumbs:
J
"Home is where you park it", so the saying goes. That may yet come true.. :oops:

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TerryG
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Re: Special prep for zinc coated metal?

#5 Post by TerryG » Wed Mar 09, 2016 12:34 am

I have a major thread update due.
Every time I think i'm getting close to done, I take another panel off (in this case a front wing) and find either something new that needs fixing or in this case, something I knew was a bit frilly is now absent. ie the lower mountings for the leading edge of the front wing and front lamp cluster aren't actually attached to anything on the passenger side and i'm assuming the drivers side is as bad.

For anyone that stumbles in to any of my rambling about range rover parts in the future, these guys make repair panels at very reasonable prices BUT their a/b post lower repairs are "over panels" and need cutting down to be a proper repair rather than a bodge:
http://www.yrm-metal-solutions.co.uk/
Understeer: when you hit the wall with the front of the car.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.

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SirTainleyBarking
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Location: Solihull, where Landrovers come from

Re: Special prep for zinc coated metal?

#6 Post by SirTainleyBarking » Thu Mar 10, 2016 12:27 am

Cool link.
I share the pain of welding a Discovery 1, which is to be honest a Rangie Classic with it's scruffs on.
Landrovers and Welding go together like Bread and Butter. And in the wet they are about as structurally sound

Biting. It's like kissing except there's a winner

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TerryG
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Re: Special prep for zinc coated metal?

#7 Post by TerryG » Thu Mar 10, 2016 1:18 pm

Yep, lots of bits match perfectly between disco 1 and RR. Even the disco2 shares quite a few.
My light boxes (front body mounts) should be here today although I am already booked to be out and about both days this weekend so they will have to wait a week before I get to fit them.
Hopefully with lighter evenings from Monday onwards, i'll be able to get more done :)
Understeer: when you hit the wall with the front of the car.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.

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Luxobarge
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Re: Special prep for zinc coated metal?

#8 Post by Luxobarge » Thu Mar 10, 2016 5:19 pm

TerryG wrote:Hopefully with lighter evenings from Monday onwards, i'll be able to get more done :)
Clocks don't go forward until 27th March mate - sorry! ;)
Some people are like Slinkies - they serve no useful purpose, but they still bring a smile to your face when you push them downstairs.

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TerryG
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Re: Special prep for zinc coated metal?

#9 Post by TerryG » Thu Mar 10, 2016 7:02 pm

DOH!
Understeer: when you hit the wall with the front of the car.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.

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