Spot welding galv sheet ?

[CompoSimmonite]

I intend building a new rear body tub for my Land Rover out of galv sheet.
The panels will be joined together with my old, but little used, TI Crypton automotive spot welder.
I assume the electro galv finish will need to be removed on the areas to be welded. Weld though seal sealer will be used on the joints (and the external seams).

What is the best way of removing the galv finish ?

Thanks.

Paul H

 

[rtbcomp]

Welcome to the forum.

Grinding would be the best way to remove galvanising, taking precautions not to breath in the dust.

Don't forget to post photos of this project in the projects section!

 

[Arsonista]

Galv will spot weld OK without removal. You may just have to clean the tips more often and it may spark a bit. Watch the fumes though. Best to try a scrap piece.

 

[Shox Dr]

WHS. galv with spot but needs more heat, as the zinc will melt, but the steel will no. Best to experiment with some off cuts. And remember the correct way to test is not to twist the pieces but to try and peel them apart, the spot weld plug should stay intact, leaving a hole on the other peice.

Hope that makes sense

 

[CompoSimmonite]

Thanks for advise.
I'll try a few srcap pieces.
I get claustrophobic so always work outside or at worse under the carport - never in the garage. That means normally plenty of "free air" around and hopefully fumes won't be a problem.

Paul H