need help welding

I have a 1970 HT panelvan which i am restoring. I have replaced a floor panel but i cannot get the main undersuport panel to take to the new floor panel i have cleaned thw paint off the area need and clamped it tight. I drilled holes throught the support panel and gave plenty of weld but it did not take in any area why is this happening can anyone help

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LinuxH4x0r9 years ago
Try a different type of metal.
Unless he is using explosives to clad the metals, he cant use a different metal.
Isn't that basically the same thing I said? Actually you can if you use brass
Goodhart9 years ago
I can't "prove this" by a quick online search (although I tried to), it sounds as though one of 2 conditions exists: either the gauge of the metal is so different, the one is not getting to a proper temperature, or they are vastly different metals (I suspect this) and the weld is not taking because of incompatibility.
wayneavery (author)  Goodhart9 years ago
no I thought that too, but the metals are the same and supplied by rare spares for replacement of this part as it is a common problem in this vehicle. They are the only ones available, what sort of mig/wire/gas do you use when you are flat welding? maybe that will help me.
Does this link on flux help ?

Remember to keep, a make sure the flux, whether on the rod or loose, clean and especially DRY !.
wayneavery (author)  Goodhart9 years ago
mig welders dont use rods my freind??? lol
Sorry, I missed that in your original subject up there, I hadn't realized you were using MIG
Hmm, I only have one welder at home, a 100 amp standard electric arch welder. It is not so good with thin metal (eats it like wax in a flame) and some alloys just distribute heat too well.

Your case almost sounds like you are using plane welding rods without any flux coating on them.

Or, as Nacho said, you may just need to get it hotter, and so bumping up the amps may help. *shrug*
use self tapping screws to hold in place tightly before welding together when done simply weld holes shut. mig with co2 25% & 75% argon aka c25 .023" wire and short tacks all across then go back and do more tacks untill it is fully welded. if dissimilar guage concentrate most heat on thicker material. check out metal fabricators handbook by ron & sue fournier or welder's handbookboth published & printed by hpbooks these should help out good luck!!
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