The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-04-2016, 09:15 AM   #1
jcnelson
Registered User
 
Join Date: Nov 2014
Location: jacksonville florida
Posts: 128
Welding queston

Has I am no pro by any means as I am welding in new patch panels I am getting small holes where weld is missing or blowout holes, nothing huge and I go back over and reweld as much as I can. My queston is can I use some body filler to complete or does it need to be 100 % welded seam
jcnelson is offline   Reply With Quote
Old 06-04-2016, 09:16 AM   #2
projectking
Registered User
 
projectking's Avatar
 
Join Date: Oct 2006
Location: Orland Park Il
Posts: 2,041
Re: Welding queston

100% welded. You either have too much heat or didn't cut back far enough to where the steel is thicker.
__________________
68 GMC C3500 Longhorn DRW
67 Chevy C10 LWB
90 Mustang Gt
90 Mustang Notchback
projectking is offline   Reply With Quote
Old 06-04-2016, 09:21 AM   #3
jcnelson
Registered User
 
Join Date: Nov 2014
Location: jacksonville florida
Posts: 128
Re: Welding queston

Thanks I have adjusted my heat up and down. And either don't get good penetration or burn out blow holes. I want a quality end result.
jcnelson is offline   Reply With Quote
Old 06-04-2016, 09:38 AM   #4
Redline novdog
Registered User
 
Redline novdog's Avatar
 
Join Date: Jan 2012
Location: Washington,Il
Posts: 632
Re: Welding queston

I'll throw my 2 cents in. I too am not a professional welder. I too blew holes in some panels on my Nova . I also tried adjusting the heat and feed to no avail. A pro welder at work said I should try a smaller gauge of wire
__________________
It builds on my intelligence when I make a mistake, Boy am I building on it!
'67 C-10,'70 Nova SS
Redline novdog is offline   Reply With Quote
Old 06-04-2016, 09:42 AM   #5
hemi43
Registered User
 
hemi43's Avatar
 
Join Date: Mar 2015
Location: Ontario Canada
Posts: 1,496
Re: Welding queston

If you're using a MIG, you'll never get a 100% seam, that's why I TIG all my panels.
Regardless, once you have your panel welded on and are ready for body work, grind the weld flat and use short strand fiberglass filler over the seam. This product is waterproof and should last a lifetime. On the backside of the weld, I always use a 2-part seam sealer. The idea is to keep moisture from getting into that seam.
Not blowing holes in panels is a skill that will be learned over time. Instead of turning down heat setting, keep your stitches shorter. You really shouldn't be on the trigger more than 1 second when using MIG on sheet metal. Another way of preventing blow through is to use a back-up bar made of copper to try and soak some of the heat from the surrounding metal.
You didn't specify what type/size of machine , and what size wire you're using. For sheet metal, you want to use .023 filler wire.

Last edited by hemi43; 06-04-2016 at 09:51 AM.
hemi43 is offline   Reply With Quote
Old 06-04-2016, 09:45 AM   #6
100%Chevy
Registered User
 
Join Date: Jun 2008
Location: Moss Point,Ms.
Posts: 1,439
Re: Welding queston

The distance from the metal and the a quick squeeze of the trigger on top of and just forward of the last tack.
You want the new weld to just run(on it's on) from the last weld into the gap you're trying to fill.Wait for the red to go away before the next tack!
Takes time and patience to get it to do right--Is the hardest part for me!
Mike.
100%Chevy is offline   Reply With Quote
Old 06-04-2016, 02:15 PM   #7
Redline novdog
Registered User
 
Redline novdog's Avatar
 
Join Date: Jan 2012
Location: Washington,Il
Posts: 632
Re: Welding queston

Thanks for the info hemi43, I just went to the garage and checked the wire size. I bought .023" for the panels ! I was using .030" . I have not used the .023" wire yet hopefully that will help.
__________________
It builds on my intelligence when I make a mistake, Boy am I building on it!
'67 C-10,'70 Nova SS
Redline novdog is offline   Reply With Quote
Old 06-04-2016, 03:04 PM   #8
davepl
Registered User
 
davepl's Avatar
 
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
Re: Welding queston

You're not trying to weld a continuous seam, are you? That'll probably be too much heat and you'll blow through.

I'm a junior hobbyist welder (not a good one) but I tack-stitch jumping around until I've got the whole thing into a continuous weld and then grind.
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
davepl is offline   Reply With Quote
Old 06-04-2016, 03:12 PM   #9
Redline novdog
Registered User
 
Redline novdog's Avatar
 
Join Date: Jan 2012
Location: Washington,Il
Posts: 632
Re: Welding queston

Quote:
Originally Posted by davepl View Post
You're not trying to weld a continuous seam, are you? That'll probably be too much heat and you'll blow through.

I'm a junior hobbyist welder (not a good one) but I tack-stitch jumping around until I've got the whole thing into a continuous weld and then grind.
Yes you have to spot weld the whole seam.Thanks for bringing that forward as did an earlier post!!!
__________________
It builds on my intelligence when I make a mistake, Boy am I building on it!
'67 C-10,'70 Nova SS
Redline novdog is offline   Reply With Quote
Old 06-04-2016, 08:10 PM   #10
jcnelson
Registered User
 
Join Date: Nov 2014
Location: jacksonville florida
Posts: 128
Re: Welding queston

Thanks all, I've Ben using .30 I am going to drop down to the 23 see that helps. I do jump all over and just a spot at a time no long runs.. My welder is east woods mig 175 it's is by far the best welder I have ever used, I used to have a Hobart 135 I have always had issues like this on sheet metal and have always used the 30 wire
jcnelson is offline   Reply With Quote
Old 06-04-2016, 09:22 PM   #11
Dustytrix
Registered User
 
Join Date: Jan 2012
Location: Petal,Ms.
Posts: 428
Re: Welding queston

One more thing to check, may sure the welder is wired for gas if you are using gas. Most welders come wired for flux core wire. It makes a huge difference.
Dustytrix is offline   Reply With Quote
Old 06-04-2016, 10:30 PM   #12
swamp rat
Registered User
 
swamp rat's Avatar
 
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
Re: Welding queston

Quote:
Originally Posted by jcnelson View Post
Thanks all, I've Ben using .30 I am going to drop down to the 23 see that helps. I do jump all over and just a spot at a time no long runs.. My welder is east woods mig 175 it's is by far the best welder I have ever used, I used to have a Hobart 135 I have always had issues like this on sheet metal and have always used the 30 wire
You probably know but smaller wire less heat.. I still get a blow thru with .023 but not nearly as bad as with .030..
__________________
Mike.

Swamp Rat build thread :
http://67-72chevytrucks.com/vboard/s...d.php?t=595019

72 3/4T 4X4
4" BDS Lift
33" BFG's
swamp rat is offline   Reply With Quote
Old 06-04-2016, 11:54 PM   #13
sdotrivers15
Registered User
 
Join Date: Jul 2015
Location: Charleston, SC
Posts: 36
Re: Welding queston

Make sure you're welding on good metal.
sdotrivers15 is offline   Reply With Quote
Old 06-05-2016, 12:16 AM   #14
midniteblues
Registered User
 
midniteblues's Avatar
 
Join Date: Jul 2011
Location: strausstown pa
Posts: 3,394
Re: Welding queston

Just too be sure that you know you should have a .023 tip on the gun and to swap your drive rolls too fit the 023 wire.

Once all is set practice on some scrap again.
Lay a few beads too fine tune the settings.

Try Clipping the wire at a few different lengths and vary your hold out slightly.
find what works best for your machine.
__________________
81 camaro 355 4/spd 342 posi my first love.
67 swb step 454/4spd ott 373 posi 4/7 drop.
2000 s10 zr2 little blue truck that never gets stuck.
'74 heald super bronc vt8. tecumseh powered moon rover.
midniteblues is offline   Reply With Quote
Old 06-05-2016, 07:15 AM   #15
dirtyjim
Registered User
 
dirtyjim's Avatar
 
Join Date: Feb 2013
Location: alvin, texas
Posts: 622
Re: Welding queston

if you have good access to the back of the panel you can also use a copper spoon or a piece of copper held on with a magnet. all, of mine are homemade and work really good when filling in holes. use them with a mig, not a tig. with a tig the copper will draw in a lot of your heat from the arc causing you to have to up the amps
__________________
1967 C10 lwb two tone, 305 & rat fink style floor shifted 700r4, 20" steelies
2004 2500HD utility bed aka Brutus
dirtyjim is offline   Reply With Quote
Old 06-05-2016, 07:33 AM   #16
GR8-68
Senior Member
 
GR8-68's Avatar
 
Join Date: Jun 2009
Location: Belews Creek , NC
Posts: 4,220
Re: Welding queston

Welding panels takes lots of time and patience. If you get in a hurry you have already messed up, don't want to warp the panel or you will have body man nightmares..
GR8-68 is offline   Reply With Quote
Old 06-05-2016, 02:50 PM   #17
Travis1974
Registered User
 
Join Date: May 2016
Location: Leander,Tx
Posts: 28
Re: Welding queston

Body panel skin is all stitch welding. a few seconds max per weld. At least thoughts how I was taught.
I would emphasize small welds spread out here and there. I like to work on several skins at the same time. You want spots long enough to get the metal flowing and not popping but short enough to not warp the metal. I do small welds 1/2" long and spread out over the seam like 8" apart at least. I work several parts at a time so that I never have to stop welding to let them cool. By the time I'm done running through I can go back to where I started and it's cool enough to keep welding. I get continuous seams and no warping. Its all about the metal flowing ahead and behind the wire. Not right where the wire is. A nice flow as you stitch the panels together.
Travis1974 is offline   Reply With Quote
Old 06-05-2016, 03:07 PM   #18
Redline novdog
Registered User
 
Redline novdog's Avatar
 
Join Date: Jan 2012
Location: Washington,Il
Posts: 632
Re: Welding queston

Good info Travis1974. I am a novice to this and like all the input for things I can try! Sorry to kinda highjack the thread, but all good info!!
__________________
It builds on my intelligence when I make a mistake, Boy am I building on it!
'67 C-10,'70 Nova SS
Redline novdog is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
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 -4. The time now is 07:56 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com