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Floor Pan - Butt or Lap Weld Question


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I tried searching for this, but doesn't seem to have been asked yet.

I have heard rumours that in Australia we have to lap weld floor pans, not butt weld - is this correct? If so, does anyone have a link to any standards for car restos, as there may be other things that one needs to consider when repairing a car?

Cheers,

Mike

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38 minutes ago, MikeFarkas said:

I tried searching for this, but doesn't seem to have been asked yet.

I have heard rumours that in Australia we have to lap weld floor pans, not butt weld - is this correct? If so, does anyone have a link to any standards for car restos, as there may be other things that one needs to consider when repairing a car?

Cheers,

Mike

Completely false. 
It's an old panel beaters excuse they use because they can't weld and can't 'afford' the time to butt weld a panel in correctly.

There's no AS for 'vehicle restoration' - feel free to look it up.
Also repairs to a vehicle over 10 years old don't actually require an inspection or engineers report, unless significant chassis modifications have been made.
I do however need to state this: unless you are competent welder and have some idea rust repairs, it's best left to professionals.
 

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Thanks Lurch. I had heard it only twice, but there was never any followup or specific details.

Every other piece of advice said that "lap welds on floor pans will invite rust" - not what a Datsun needs more of.

BTW - I've been looking back at some of your resto's that you documented here. Loving your work!!

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On 2/16/2021 at 10:48 AM, C.A.F. said:

Completely false. 
It's an old panel beaters excuse they use because they can't weld and can't 'afford' the time to butt weld a panel in correctly.

There's no AS for 'vehicle restoration' - feel free to look it up.
Also repairs to a vehicle over 10 years old don't actually require an inspection or engineers report, unless significant chassis modifications have been made.
I do however need to state this: unless you are competent welder and have some idea rust repairs, it's best left to professionals.
 

Hey Lurch and any other experts, the front and rear of the original floor pans had lapped joins from factory right? 

If you replace the floors on projects do you keep these lap joins or do you convert to butt welds? 
 

ryan 

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