Russ Posted 22June, 2015 Report Share Posted 22June, 2015 So, as part of my 'long term' restoration plan I've been thinking about getting the body galvanized again cold galvanising is basically just a zinc coating that is painted onto the car, whereas hot dip is submerging the car and using galvanising/electrolisis to get the zinc to bond to steel. I know that as of 76-77 whole cars were galvanized, but does anyone know for sure if it was hot dip? I can only assume so, but from the stuff we do at work any large panels warp when hot dipped - i was wondering how they got around this? anyone got any information on the subject? Link to comment Share on other sites More sharing options...
Pauly Posted 22June, 2015 Report Share Posted 22June, 2015 I'm pretty sure it's hot dipped Link to comment Share on other sites More sharing options...
tazzieman Posted 22June, 2015 Report Share Posted 22June, 2015 So, as part of my 'long term' restoration plan I've been thinking about getting the body galvanized again cold galvanising is basically just a zinc coating that is painted onto the car, whereas hot dip is submerging the car and using galvanising/electrolisis to get the zinc to bond to steel. I know that as of 76-77 whole cars were galvanized, but does anyone know for sure if it was hot dip? I can only assume so, but from the stuff we do at work any large panels warp when hot dipped - i was wondering how they got around this? anyone got any information on the subject? Small panels expertly welded together! Some info here Link to comment Share on other sites More sharing options...
Russ Posted 22June, 2015 Author Report Share Posted 22June, 2015 Thanks tazzieman, that's some great info. So they dip the individual panels, then weld them together? so they had to remove the zinc from the welds then 'cold paint' the zinc on the joint? Guess it's not something that can be easily replicated with a complete bodyshell This seems like the go now though - e-coating! - I assume this resolves the issues with paint reactions too http://forums.pelicanparts.com/porsche-911-technical-forum/324520-full-emersion-baths-factory-paint-prep-please-educate-me.html#post3035315 Link to comment Share on other sites More sharing options...
tazzieman Posted 22June, 2015 Report Share Posted 22June, 2015 The welding of zinc required special techniques , I think higher current etc plus the safety concerns vapours etc. the zinc added around 10kg per car. Somewhere there's a video of it all. Link to comment Share on other sites More sharing options...
Pauly Posted 22June, 2015 Report Share Posted 22June, 2015 finding someone to dip the car in todays world would be a task i think. Link to comment Share on other sites More sharing options...
tazzieman Posted 22June, 2015 Report Share Posted 22June, 2015 https://books.google.com.au/books?id=pVO_IOGQRNwC&pg=PA146&lpg=PA146&dq=porsche+911+chassis+welding+1970s&source=bl&ots=cbEzbPvNJJ&sig=7_TYuW_TnqR1MGdda5pEZRVWCX8&hl=en&sa=X&ei=DJOHVfuKE4ONmwWBoYLQDw&ved=0CEkQ6AEwBw#v=onepage&q=porsche%20911%20chassis%20welding%201970s&f=false Link to comment Share on other sites More sharing options...
Fraz Posted 22June, 2015 Report Share Posted 22June, 2015 When I fully restored my 69 Holden, I had similar thoughts on the best way to preserve the body. The car was stripped to a bare shell, after much research I ended up spraying wurth cavity wax using their special gun and injecting rods. Car is still perfect some 10 years after it was done. https://insyncro.wordpress.com/2012/08/23/underbody-spraying-and-cavity-waxing-made-easy-with-the-wurth-multi-sprayer/ http://www.wurth.co.nz/cat/files/assets/downloads/page0112.pdf Link to comment Share on other sites More sharing options...
Peter M Posted 22June, 2015 Report Share Posted 22June, 2015 So they dip the individual panels, then weld them together?Russ,Just to clarify, they press the panels out of sheet steel that has already been hot dipped galvanised and then weld these separate panels together to form a body. Link to comment Share on other sites More sharing options...
Harvs11 Posted 22June, 2015 Report Share Posted 22June, 2015 E coating requires holes in the body for the carrier liquid to pass through to all the internal cavities and also drain out leaving a dry shell. These are designed in the panels from factory. If your car predates this process the holes won't be there. The cavities will remain unprotected. Link to comment Share on other sites More sharing options...
Peter M Posted 22June, 2015 Report Share Posted 22June, 2015 e coat?I'm sure I'm not the only one who knows little about this. I found this useful summary:http://www.metokote.com/coating-technologies/electrocoating/e-coat-process-specifics/#.VYe-pk0Vi1s Link to comment Share on other sites More sharing options...
Harvs11 Posted 22June, 2015 Report Share Posted 22June, 2015 Also known as ELPO (Electro Coat Paint Operation) Check out this explanation pertaining to vehicle bodies ELPO paint process Link to comment Share on other sites More sharing options...
Peter M Posted 22June, 2015 Report Share Posted 22June, 2015 In a car plant in the U.K., a 65mm CDSA™seal was fitted to an IDP centrifugal pump,model Frame 4. The duty being pumped waselectro paint operating with a shaft speed of1440 rpm, with an inlet pressure of 25 psi (1.7bar) and outlet pressure 90 psi (6.2 bar). Theseal faces were TC/TC//CRO2/C with Viton®elastomers and 316L wetted parts. Themechanical seal operated with an SSE10™W2 system.Geezus Harvs!That's getting too anorak, even for me! LOL Link to comment Share on other sites More sharing options...
Harvs11 Posted 22June, 2015 Report Share Posted 22June, 2015 But it had pretty pictures! Link to comment Share on other sites More sharing options...
Harvs11 Posted 22June, 2015 Report Share Posted 22June, 2015 For those with a lesser attention capacity This footage shows a typical modern ELPO process line. The rolling action as the car is dipped ensures the liquid flows through all the body cavities and drains effectively. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.