yet another welding question..

cbr900racer · Posted: Sat Aug 13, 2005 7:41 am Post subject: yet another welding question..

i have been replacing body panels on my 74. my question is...do i have to weld around the entire piece? cant i just do small one inch beads around it then use body filler? any help would be appreciated
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71 Bay (1776 in process)
94 Sonoma
98 Suburban (bike hauler)
97 Blazer
07 Nitro
94 CBR900RR (runs 5.70s 1/8 mile)

sbnova · Posted: Sat Aug 13, 2005 9:53 am Post subject:

You can just tac it in, but moisture will usually find its way to the filler everywhere you didnt fully weld it. Even if you paint and coat the backside, it wont last as long as fully welding the piece. How long are you gonna keep the car?

If you dont fully weld it, I would paint the back with a good rust preventative paint - a light coat of maybe a zinc rich primer or iron oxide, then apply some seam sealer and smooth it out and paint it with a good quality topcoat.
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cbr900racer · Posted: Sat Aug 13, 2005 11:56 am Post subject:

i plan on keeping this one forever...i will just go ahead and do a full weld. it wasnt that i minded, but if i didnt have to, why do it, right? im using a fluxcore wirefed and have to do several small beads which get annoying..i am going to get me a auto-darkening helmet today, i think that will make the job easier. as for the back of it, on the driver side, i wirebrushed as best i could, then coated it twice with rust bullet. when i am done, i plan on tacking inside panel back on, using sealer, then applying the expanding foam..hopefully that will keep her going for a while. thanks for the reply!
_________________
71 Bay (1776 in process)
94 Sonoma
98 Suburban (bike hauler)
97 Blazer
07 Nitro
94 CBR900RR (runs 5.70s 1/8 mile)

Frankenbeetle · Posted: Sat Aug 13, 2005 12:04 pm Post subject:

From what I hear the expanding foam insulation actually traps the moisture. You may want to research that before using it.
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Samba Whipping Boy of '07

cbr900racer · Posted: Sat Aug 13, 2005 1:46 pm Post subject:

any idea on what the better way is? anyone ever just not use anything? other than reinforcing the metal, i dont see the use for it anyways, except maybe for sound deadening..i also plan on blocking off the vents as well, so hopefully no moisture will ever get the chance to get in there..
_________________
71 Bay (1776 in process)
94 Sonoma
98 Suburban (bike hauler)
97 Blazer
07 Nitro
94 CBR900RR (runs 5.70s 1/8 mile)

Frankenbeetle · Posted: Sat Aug 13, 2005 1:55 pm Post subject:

If there is air in the space, then there is moisture. Condensation of air due to temperature change is enough to start the water in there to eating away at your panels. Sound deadening can be a mix of primer under rust bullet under truck bed liner under dynamat. That should take care of vibratory noises. Not to mention that damned foam is heavy.
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Samba Whipping Boy of '07

cbr900racer · Posted: Sat Aug 13, 2005 3:45 pm Post subject:

okay, makes sense to me...ill do like you said on the inside..rustbullet, truck bed liner, then the mat..thanks for the help Very Happy

_________________
71 Bay (1776 in process)
94 Sonoma
98 Suburban (bike hauler)
97 Blazer
07 Nitro
94 CBR900RR (runs 5.70s 1/8 mile)

Frankenbeetle · Posted: Sat Aug 13, 2005 4:36 pm Post subject:

No worries. I just hate to see a car with the potential to start rusting from the inside. The layered method I mentioned isn't exactly cheap, but done well it can really drop the noise level down in the cabin.
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Samba Whipping Boy of '07

Chewbacca · Posted: Sat Aug 13, 2005 9:06 pm Post subject:

Would underbody tar be ok for seam sealer?

Cheers

cbr900racer · Posted: Sun Aug 14, 2005 7:40 am Post subject:

no idea, but is good question...
_________________
71 Bay (1776 in process)
94 Sonoma
98 Suburban (bike hauler)
97 Blazer
07 Nitro
94 CBR900RR (runs 5.70s 1/8 mile)

Jowlz · Posted: Sun Aug 14, 2005 12:14 pm Post subject:

get can of brushable seam sealer. tar never really dries out. seamsealer cures and is paintable.
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The honey-do list put my project on hold.......

cbr900racer · Posted: Sun Aug 14, 2005 6:37 pm Post subject:

where can you get that? auto parts store? body shop?.
_________________
71 Bay (1776 in process)
94 Sonoma
98 Suburban (bike hauler)
97 Blazer
07 Nitro
94 CBR900RR (runs 5.70s 1/8 mile)

Jowlz · Posted: Mon Aug 15, 2005 12:39 pm Post subject:

Find a body shop supply store. Maybe NAPA.
_________________
The honey-do list put my project on hold.......

57 Zwitter? · Posted: Tue Aug 23, 2005 2:11 pm Post subject:

After welding apply POR-15. Flood it into all of the welds, seams etc. Then put on your seam sealer, undercoating and sound deadener. Moisture will never penetrate POR-15


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