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Old 06-15-2017, 02:17 PM
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Welding floor pans opinion

Hello all, I have a question I have 74 Nova and I need to replace the floor pans my question is I have a wire welder do you think that would be ok to weld the floors in or do you think I should borrow my buddy gas welder.

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Old 06-19-2017, 02:09 PM
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Quote:
Originally Posted by Truckermike View Post
Hello all, I have a question I have 74 Nova and I need to replace the floor pans my question is I have a wire welder do you think that would be ok to weld the floors in or do you think I should borrow my buddy gas welder.

Given that in a 74 Nova the floor pans are a structural part I think the first question would be are you a competent enough welder gas or wire feed that you're will to bet your life on your welds. Other than that I don't see where it makes a huge difference other than how much heat that gets put into the metal adjacent to the welds. In that regard the wire feed tends to get the job done without putting so much heat around the weld zone instead keeping it more concentrated with the weld itself.


Being sheet metal this stuff will buckle a lot, the technique will be to use a number of tacks then weld the gaps. You'll probably still find yourself doing a fair amount of hammer and dolly work to smooth things out.


Bogie
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Old 06-19-2017, 03:30 PM
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IF by 'wire' you mean MIG , thats fine. clean the weld area up real good [no rust,paint, tar ect both sides]. hold the pan in place with teck screws and go.
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Old 06-20-2017, 02:03 AM
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Teck screws what is that like self tapping screws. would you screw those into the cross member to hold down tightly then weld how about when done welding should I take them out then weld in the holes or just learn them in. Thanks
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Old 06-20-2017, 02:04 AM
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Darn spell check leave them in lol
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Old 06-20-2017, 06:08 AM
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remove and weld hole as you go
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Old 06-20-2017, 10:54 AM
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yes on the mig

but understand as was pointed out, heat is your enemy. do just a little more then a tack every 2".. and keep going around till all the tacks touch each other. grind and spot weld where needed.
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Old 06-20-2017, 01:45 PM
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That is good info I will do that thanks
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Old 06-20-2017, 02:42 PM
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your welcome
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Old 06-20-2017, 07:07 PM
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I saw this post when it first came up but was confused by the terminology also. If you have a wire welder that uses flux core wire instead of bottled gas, yes that will probably work fine. Its a little messier, grinding and cleanup-wise. I did collision repairs with one for a few years. Just do some test pieces on metals of similar thickness before diving in, so you can be sure the welder setting is doing what you want.
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Old 06-21-2017, 12:46 PM
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I replaced the floor pans, front and rear, on a 1967 Firebird convertible for my daughter several years ago. I used a flux-core wire welder and tried to duplicate the spot welds on the old (factory?) floor boards. I drilled holes in the new pans, then welded in each hole. It gave a good weld that didn't need grinding. However, the splatter endemic to flux-core needed some grinding for clean-up, after which I used seam sealer top and bottom, then painted/undercoated the seam. It seemed to work quite well, with no apparent vehicle strength or rigidity concerns. I lost track of the car after it was sold and shipped to Europe.
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Old 06-21-2017, 05:20 PM
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Thanks guys I may tackle it this weekend a little cleaning up is no big deal part of the work lol
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