All MetalShaping

Go Back   All MetalShaping > General Metal Shaping Discussion > Welding Sheet Metal
  Today's Posts Posts for Last 7 Days Posts for Last 14 Days  

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 09-13-2013, 11:16 PM
neilb's Avatar
neilb neilb is offline
MetalShaper of the Month March 2019
 
Join Date: Aug 2013
Location: Melbourne OZ
Posts: 672
Default

Quote:
Originally Posted by cords View Post
weld thru primer is for spot welding not mig ,mig welding will burn it away and leve an acidic residue behind
not wanting to create an argument but surely spot welding would do the same but on a somewhat smaller scale, an 8mm hole to be plug welded would create approx. an 10mm weld nugget and a burn ring around 13mm?

depending on the spot weld machine used and diameter of the electrodes a spot weld nugget would be around 5mm to 10mm with a burn ring around 12mm on a 10mm nugget?

the material is still being heated to a molten steel temp.

just my logical thoughts maybe there is something I don't know and could learn
__________________
Neil
Reply With Quote
  #12  
Old 09-14-2013, 04:54 AM
cords cords is offline
Member
 
Join Date: Apr 2010
Location: Sydney Australia
Posts: 178
Default

Quote:
Originally Posted by ekdave1962 View Post
hey cords is your hanging about there to you should post some of lone stars work here that will be impressed i think
hi mate have put bits and pices up here just been busy on the new house ,got the bug again now, going to start building the new chasis for my 46 chev soon. im not at lone star any more back driving cranes ,old boss made me an offer to good to refuse
Cheers Gav
Reply With Quote
  #13  
Old 09-14-2013, 04:57 AM
cords cords is offline
Member
 
Join Date: Apr 2010
Location: Sydney Australia
Posts: 178
Default

Quote:
Originally Posted by neilb View Post
not wanting to create an argument but surely spot welding would do the same but on a somewhat smaller scale, an 8mm hole to be plug welded would create approx. an 10mm weld nugget and a burn ring around 13mm?

depending on the spot weld machine used and diameter of the electrodes a spot weld nugget would be around 5mm to 10mm with a burn ring around 12mm on a 10mm nugget?

the material is still being heated to a molten steel temp.

just my logical thoughts maybe there is something I don't know and could learn
you may be onto something there Neil just passing on what my supplyer told me
Reply With Quote
  #14  
Old 09-14-2013, 12:13 PM
CARS CARS is offline
Member
 
Join Date: Aug 2009
Location: New Ulm, MN
Posts: 831
Default

Check out section 9.1

http://www.i-car.com/pdf/upcr/procedures/we/we01s.pdf
__________________
Christopher Rathman

C
hris'
Autobody
Restoration
Service




Reply With Quote
  #15  
Old 09-14-2013, 04:55 PM
cords cords is offline
Member
 
Join Date: Apr 2010
Location: Sydney Australia
Posts: 178
Default

well there you go i stand corected
Cheers Gav
Reply With Quote
  #16  
Old 10-10-2013, 11:26 PM
bstevens bstevens is offline
Member
 
Join Date: Sep 2010
Location: grand rapids MI.
Posts: 15
Default

just before welding a quick pass with a hand held spot blaster "sand blaster" cleans the plug hole for good welding, although sand blasting makes such a mess it sucks to use, the copper based weld thru primers weld much better than the zinc based, now Chrysler says to use no weld thru primer at all and I think benz says the same thing. whats the best answer.... a little of all info posted and what ever you can make work, but remember bare metal to bare metal will rust!

there's my 2 cents
Reply With Quote
  #17  
Old 11-08-2013, 01:52 PM
mr-cooper mr-cooper is offline
Member
 
Join Date: Oct 2013
Location: Germany
Posts: 29
Default

I use an Inox-Spray (stainless steel spray) from technolit (germany).
Great stuff!!
__________________
Olli
Reply With Quote
  #18  
Old 11-08-2013, 07:44 PM
dpcsix dpcsix is offline
Member
 
Join Date: Oct 2013
Location: Bridgewater, Mass
Posts: 6
Default

great topic, battle with that decision all time, use it ya get crappy welds dont use it you worry about rust, then you take apart a 40 year old car and you see almost shiny metal under laps and joints...makes ya wonder
__________________
Dan Clancy
Reply With Quote
  #19  
Old 11-09-2013, 05:37 PM
carl 180 carl 180 is offline
MetalShaper of the Month Oct. 2018
 
Join Date: Apr 2012
Location: Yorkshire, England
Posts: 145
Default

i use wurth weld thru never had any problems mig plug or spot welding i only spray light coat on panels. i think its a must imo
__________________
Carl
Reply With Quote
  #20  
Old 11-09-2013, 05:57 PM
Khe Sanh's Avatar
Khe Sanh Khe Sanh is offline
Member
 
Join Date: Jan 2013
Location: Aberdeen, Scotland
Posts: 188
Default

Weld through primer isn't that great in reality in stopping corrosion, better than nothing though but like the other guys have said a good epoxy is better. I have some steel sheet in my workshop which has weld through primer on one side, it has rust coming through but the other side is worse.

You can also get epoxy paints with high zinc content like Carbozinc 858, it doesn't bond as well as other epoxy paints and you obviously need to paint it directly onto bare metal to benefit from the anti-corrosion properties of the zinc. Carbozinc is ideal for areas like inside sills and then over coated with an epoxy mastic coating. PU adhesive/sealer run along any seams in between coats of epoxy mastic should keep the seams rust free for many a year.
__________________
Mitch
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 02:46 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.