welding on car what do I disconnect - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Garage - Tools
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 03-24-2008, 09:31 AM
Registered User
 
Join Date: Jun 2007
Location: plano texas
Posts: 374
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
welding on car what do I disconnect

I have never welded anything on the car. I must disconnect my unilite do I need to disconnect battery? I have a master disconnect.

    Advertisement

Last edited by tomthecomic; 03-24-2008 at 09:32 AM. Reason: adding more
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-24-2008, 09:45 AM
Henry Highrise's Avatar
Lost in the 60's
 
Last wiki edit: Removing stuck fasteners Last photo:
Join Date: Dec 2001
Location: Dixieland
Age: 69
Posts: 15,189
Wiki Edits: 4

Thanks: 0
Thanked 10 Times in 9 Posts
I have heard a lot of folks say to disconnect the battery but I have been welding on vehicles for years and years and have never disconnected anything....never had a problem.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-24-2008, 10:25 AM
powerrodsmike's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Make a fiberglass fan shroud
Last journal entry: Next.. ..Bagging the king B (barge)
Last photo:
Join Date: Jan 2005
Location: gilroy, california
Age: 53
Posts: 4,108
Wiki Edits: 161

Thanks: 0
Thanked 3 Times in 3 Posts
If you are concerned, disconnect the battery, then put your ground clamp close to where you are welding, prefferably on the same structure or body part that is being welded, and you won't have any problems.


I rarely disconnect anything on the older cars I weld stuff on ...if a car has computers or alot of solid state items, that's when I disconnect the battery. Or I go next door to my buddies muffler shop and borrow his surge protector, it clamps across the battery terminals and protects the system from surges and I don't have to disconnect the battery and lose the stereo presets and other programming on the newer cars..(I don't do much work on newer stuff, but sometimes I do.)


Later, mikey
__________________
my signature lines...not really directed at anyone in particular..

BE different....ACT normal.

No one is completely useless..They can always be used as a bad example
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-24-2008, 10:31 AM
Member
 
Last photo:
Join Date: Jan 2003
Location: tennessee
Posts: 5,912
Wiki Edits: 0

Thanks: 0
Thanked 7 Times in 7 Posts
The biggest thing is to make SURE you are connected (grounded) to the part you are working on! For example if your ground is connected to the body somewhere and you are welding on the frame you could very well do serious damage to several things , from smoking various components to actually melting the wiring. I once saw a guy welding on the bed on a Dodge pick-up with the ground lead connected to the front of the frame and it burned off the ground straps connected to the engine! I did not see this but it comes from a reliable source- another guy was welding on a Chevy truck rear end (axle housing) with the ground connected somewhere on the front of the truck, not sure where, but the u-joints got hot enough to melt the grease out of them! The bottom line is automotive ground straps are designed to carry enough current to operate lights and not welding current so making sure of what you are connected to is more important than disconnecting things. There is the argument that if a component is disconnected it has to be safe and that would certainly be true however it is not practical to disconnect everything when welding on a vehicle and disconnecting the battery will not be much insurance.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-24-2008, 11:18 AM
Irelands child's Avatar
Registered User
 
Last wiki edit: Ford engine specifications Last photo:
Join Date: Jan 2005
Location: Upstate New York
Posts: 4,914
Wiki Edits: 8

Thanks: 14
Thanked 205 Times in 186 Posts
Just reading thru my MSD 6A/AL module installation book - and they recommend disconnecting BOTH the red and black power cables to the unit as well as the tach ground wire. My interpretation of that is - if it has electronics, disconnect the battery just to be on the safe side. Why not - it only takes a couple of minutes vs the cost of a new computer of ignition box (also wasted time). If it has points, not much to hurt.

Dave W
__________________
Irelands child
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 03-24-2008, 12:31 PM
Member
 
Last photo:
Join Date: Jan 2003
Location: tennessee
Posts: 5,912
Wiki Edits: 0

Thanks: 0
Thanked 7 Times in 7 Posts
Quote:
Originally Posted by Irelands child
- if it has electronics, disconnect the battery just to be on the safe side. Dave W

Disconnecting the battery is not going to hurt anything, and is probably a good idea, but my point is don't count on that alone as insurance that all will be OK when welding on a vehicle. The disconnected battery may not help much if welding to a part that is poorly grounded to another part that the ground cable is attached to.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 03-24-2008, 12:48 PM
Irelands child's Avatar
Registered User
 
Last wiki edit: Ford engine specifications Last photo:
Join Date: Jan 2005
Location: Upstate New York
Posts: 4,914
Wiki Edits: 8

Thanks: 14
Thanked 205 Times in 186 Posts
Quote:
Originally Posted by oldred
Disconnecting the battery is not going to hurt anything, and is probably a good idea, but my point is don't count on that alone as insurance that all will be OK when welding on a vehicle. The disconnected battery may not help much if welding to a part that is poorly grounded to another part that the ground cable is attached to.

I guess I just "understand" that my ground is going to be close to where I'm welding - just one of those things my welding instructors beat into our heads many years ago at GE. We were doing stick practice with 3/8" dia. E7016 which equals big amps and on some heavy plate
__________________
Irelands child
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 03-24-2008, 04:00 PM
Member
 
Last photo:
Join Date: Jan 2003
Location: tennessee
Posts: 5,912
Wiki Edits: 0

Thanks: 0
Thanked 7 Times in 7 Posts
I saw a guy once welding a brake line lug on a rear axle housing and he had the ground clamp attached to the wheel studs, don't know if it did any harm but the current had to flow though bearings, the axle, ring/pinion, etc and could have very well arced over at any point of contact causing a lot of damage. This was in addition to the more minor but real possibility of ruining the threads on the studs but I guess some people don't think about what could happen until it does. The thing is there is as much arc potential at the point of ground, and every place in between, as there is at the tip of the rod.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 03-30-2008, 08:52 PM
Member
 
Last photo:
Join Date: Jan 2003
Location: tennessee
Posts: 5,912
Wiki Edits: 0

Thanks: 0
Thanked 7 Times in 7 Posts
Just ran across this and thought it might be interesting.



www.autobodytoolmart.com/p-14355-17840.aspx
Reply With Quote Quick reply to this message

Recent Garage - Tools posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
donk or lambo's got nothing on this 406chevycaprice Hotrodders' Lounge 28 01-28-2008 08:09 AM
a true story abount my first car chopperdave70 Hotrodders' Lounge 7 01-26-2008 06:13 PM
It's all in the details... Nightfire Hotrodders' Lounge 18 09-16-2006 09:53 PM
Parasol Metal body filler. x711 Body - Exterior 16 02-14-2006 09:47 AM
Buyer Beware................... poncho62 Hotrodders' Lounge 10 05-19-2005 09:40 PM


All times are GMT -6. The time now is 09:19 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.