Hi Maroof,
Welding of galvanized steel should be done after stripping the paint, to the extent of at least 1" on each side of the weld bevel. Zinc evaporates very fast and creates metal fume fever(see the attached literature).
In addition the weld areas should be well ventilated. Following welding the welds could be locally re-galvanized or zinc containing paints could be applied on the weld and adjacent areas.
You may find the attachments as helpful
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Maroof Ali
Sent: Wednesday, October 20, 2010 1:41 AM
To: materials-welding@googlegroups.com
Subject: [MW:7660] Welding on galvanized plates.
I want to know, if we can weld the steel structure without removing the zinc galvanized coating.
Thanks
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