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-   -   Galvannealed sheet metal use question (https://allmetalshaping.com/showthread.php?t=18835)

Mr fixit 03-05-2019 11:29 AM

Galvannealed sheet metal use question
 
Hi Group,

I was on a car forum and someone is making floor replacement panels out of
galvannealed sheet metal. They are press stamping according to their post.

Google says;
Galvannealed Steel - zinc-iron alloy-coated by the hot-dip process followed by heating the steel to induce diffusion alloying between the molten zinc coating and the steel. The resulting finish is a dull matte surface.
Galvannealed steel is very conducive to forming, welding and allows for excellent paint adhesion. Galvannealed steel is the preferred coated steel for use in architectural applications.
Specification - ASTM A 653/A 653M, coating designation “A” (A60, A40)

My question is, has anyone worked with this and how does it hammer form? It sounds like a good candidate for floor panel replacement and that's what my project is.

Appreciate any and all comments.

TX
Mr fixit
Chris :)

billfunk29 03-05-2019 11:34 AM

welding galvanizing
 
I avoid welding galvanized metal. Fumes are hazardous.

crystallographic 03-05-2019 12:53 PM

1 Attachment(s)
Product also known as "Gal-X-C"
It can be bent, folded, hemmed, hammered, wheeled, and shrunk with various machines.
Abrasion will remove/damage the soft coating.:cool:


Attachment 51641
It can be riveted and soldered.


Brazing and welding cause fumes which make people sick, so use fans to blow fresh air across the work and out the door.
Sand back 1.5 inches from edges and down to bare steel for tig and gas welding and brazing. The welds can be hammered out.
It can be spot welded and arc welded as-is (6013), but fumes are a health hazard and work will need serious clean-up. :cool:
Galv pipe is welded a lot for hand railings.

norson 03-05-2019 02:48 PM

I don't think the health hazard warnings are nearly strong enough. I would use galvanized only if the project REQUIRED it. The floor in a car does not require it. Your car was built without good paint/primer sealer on the unfinished areas and was allowed to be out in the open more than a collector car would be. If you do just a reasonably good job on the rebuild it will outlive you.

crystallographic 03-05-2019 04:15 PM

Quote:

Originally Posted by norson (Post 153864)
I don't think the health hazard warnings are nearly strong enough. I would use galvanized only if the project REQUIRED it. The floor in a car does not require it. Your car was built without good paint/primer sealer on the unfinished areas and was allowed to be out in the open more than a collector car would be. If you do just a reasonably good job on the rebuild it will outlive you.


Yup ... seems sort of unnecessary ...

Jaroslav 03-05-2019 04:43 PM

How was is it possible to we can live up to such a long age. Last week, I was talking to an old metallshaper he have 84 years and still working a little. I got some good advice. We talked about the galvanized sheet metal and its welding. They did it normally. They were tugging their throats a little over the weekend, but they did not die.

Stress and fear it is sure death. Well use ventilation or work outdoors.:):)

Yes it is harmful, but more damage is done by the TIG and its gas.
The galvanized sheet can be used very well for spot welding. Clean work.

Charlie Myres 03-05-2019 05:06 PM

1 Attachment(s)
I made this bonnet-rib not long ago and I was surprised how well the zinc coating stuck to the surface when shrinking.

Attachment 51652

Mr fixit 03-05-2019 07:44 PM

I might have to give additional information. The galvanising is not the same as the silver galv that you see on heating ductwork or other galv metal items that we are all warned about. This is a different coating that has a dull painted finish, because the metal has been annealed, it is supposed to be easy to shape per the OP.
I didn't see any health warnings with the quick search I did.
In the link above is says it is often used for Architectural metalwork which I would assume is the metal you see on commercial bldgs as soffits, siding, and other applications.

Your right Norson, we would keep it from damage as it's our project that we take great pride in. :D

Anyway, just thinking outside of the box as I often do, thought it might be additional protection for the floors in a convertible.

TX
Mr fixit
Chris :)

RB86 03-05-2019 11:25 PM

Just not worth the risk IMO. Regular mild steel with a quality epoxy primer will do excellent.

norson 03-06-2019 01:18 AM

My grandfather was in the plating trade. He started working for Ford in Detroit in 1925 and worked until the early '30s in the plating shops. Traveled to Portland (Grapes of Wrath style) and worked in then bought a plating shop. I was seventeen when I was driving him to the hospital for radiation treatments for his throat cancer. Nasty stuff those chemical fumes.


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