Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-01-2009, 09:51 PM   #1
Newbie
 
Join Date: Nov 2009
Posts: 2
Rewards Points: 0
Share |
Default

welding grounding


I need to weld a small crack on the inside of a wood stove. I have access thru the firebox door but I am unsure on grounding for proper safety. I will be using a stand alone generator with plug in welding machine at 120 volt.

I know I need to gound the workpiece(woodstove ) to the welding machine. Do I need to have a separate ground from woodstove to building. I will probably come in contact with woodstove during welding due to limited workspace. If woodstove is grounded do I need to provide insulation between myself and and woodstove

Jeff7131 is offline   Reply With Quote
Old 11-02-2009, 05:43 AM   #2
Licensed Electrical Cont.
 
Speedy Petey's Avatar
 
Join Date: Feb 2004
Location: NY State
Posts: 6,826
Rewards Points: 0
Default

welding grounding


No, just the ground from the stove to the welder is fine.

I would also post this to a welding forum. Wood stoves are typically cast iron. Welding cast iron is extremely difficult. You may want to consider brazing it if that would work for you.

__________________
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC.
Speedy Petey is offline   Reply With Quote
Old 11-02-2009, 08:18 AM   #3
Newbie
 
Join Date: Nov 2009
Posts: 2
Rewards Points: 0
Default

welding grounding


Thanks for the comment. I have already checked the material and it is steel not cast iron.

Everthing I read indicates to not come in contact with workpiece to avoid shock. Will the ground to the portable welding machine be sufficient if the welding machine is not grounded separately ???
Jeff7131 is offline   Reply With Quote
Old 11-02-2009, 08:43 AM   #4
Member
 
Join Date: Sep 2008
Location: Oregon
Posts: 1,497
Rewards Points: 0
Default

welding grounding


It sounds like you have read the instruction manual which came with the welder. Best source of information if you have not.

Other than that, I would suggest calling the manufacturer of the welder. And sometimes manufacturers have additional information on their web sites along with regular instruction manuals. Might want to search google.com for the manufacturer's web site.
Billy_Bob is offline   Reply With Quote
Old 11-02-2009, 09:43 AM   #5
UAW SKILLED TRADES
 
Stubbie's Avatar
 
Join Date: Jan 2007
Location: Kansas
Posts: 5,012
Rewards Points: 2
Default

welding grounding


In arc welding the work piece is a part of the electrical circuit. Your ground connection completes that circuit with the welding machine. Whenever you are forced to be in contact with the material your welding you should wear the protective clothing and gloves necessary and insulate yourself from the work piece. Lay on an insulating matt of some kind. Now having said that you will see many people welding that don't bother insulating themselves from the work piece. In most cases as long as the "better completed circuit path" exists through the electrode and ground connection with the machine you would not likely take an electrical shock. But common sense tells you that being in contact with the electrical circuit while it is live is not a good idea. If your ground connection should jump off the work piece and you somehow get in series with it (cramped space) and the work piece you might get nailed. So just make sure that you are insulated from the work and the electrical circuit and you will do just fine.
No extra ground needs to be run to another grounding source. But if it existed that would seem to me to be rather dangerous to have another path that might complete the welding circuit.
__________________
" One nice thing about the NEC articles ... you have lots of choices"

Stubbie

Last edited by Stubbie; 11-02-2009 at 09:49 AM.
Stubbie is online now   Reply With Quote
Old 11-02-2009, 09:50 AM   #6
Member
 
Join Date: Oct 2009
Location: North Bay, Onterrible
Posts: 74
Rewards Points: 0
Default

welding grounding


The good thing about a welder, as long as you have the plug wired properly, is that unless you have a good ground, nothing will happen. Wiring a 220V welder is funny too because what you have in the plug are the 2 hots and the ground! No neutral!
Salem747 is offline   Reply With Quote
Old 11-02-2009, 11:21 AM   #7
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 0
Default

welding grounding


From the welder schematic in front of me, the voltage at either welder terminal is undefined with respect to power line ground, so insulate yourself from anything grounded, like water pipes, house ground wires, etc..

If you are ungrounded and touch one welder terminal you won't be shocked because there will be no current flow through your body.

You have a link to your welder's owner's manual?

Last edited by Yoyizit; 11-02-2009 at 11:25 AM.
Yoyizit is offline   Reply With Quote
Old 11-02-2009, 12:32 PM   #8
Household Handyman
 
Join Date: Feb 2009
Location: Albany, Ga.
Posts: 2,270
Rewards Points: 0
Default

welding grounding


"with plug in welding machine at 120 volt." Now a bell rings! Are you using an ARC welder (using electrodes) at 120 volts, or are you using a MIG (wire feed) welder at 120 volts? I'll never say you cannot be shocked with using a MIG welder, but the chances are less than an ARC welder. Actually, I've only seen one (1) 120 volt ARC welder in my life and it was not a good one. IF you are using a MIG welder, are you using one with or without shielding gas(es)? You stated YOU have limited workspace, so this is important. You DO NOT want to be using a MIG welder with shielding gas in an enclosed area that you MAY even stick your head into or very close to. These inert gases will deplete the oxygen/breathing air supply, like very quick. IF you are using a MIG welder with flux-cored wire, it's probably worse. The stuff in the coating of the wire is a strange mixture of chemicals to aid in the metal bonding of wire and base metal. Maybe I'm ranting on too long, buy maybe not--I've been around welding too long and seen others pass out from small mistakes.. Please be careful, Good Luck, David
Thurman is offline   Reply With Quote
Old 11-02-2009, 01:38 PM   #9
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 0
Default

welding grounding


Quote:
Originally Posted by Thurman View Post
I'll never say you cannot be shocked with using a MIG welder, but the chances are less than an ARC welder.
The voltage is substantially lower with the MIG but with wet hands you could be in serious trouble in either case.

Yoyizit is offline   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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
grounding of main panel and sub panel in older house linkysys Electrical 2 10-01-2009 04:34 PM
Grounding Method Steelhead Electrical 6 02-05-2009 11:06 AM
Does a welding generator need to be grounded? mchinea Electrical 7 01-09-2009 02:49 PM
Grounding light box n0c7 Electrical 10 10-06-2008 03:20 PM
NEC Question Jafsvcs Electrical 1 06-13-2007 05:45 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.