Welding galvanized sheet metal
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Welding galvanized sheet metal
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Warning
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It is extremely important for satisfactory spot extraction equipment to be provided in areas where heat is generated by the work carried out there, such as welding, grinding, cutting and drilling.
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Complement this with effective respiratory protection like a face mask with charcoal filter or better still a fresh-air mask.
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When heated, all paints, sealants, adhesives and anti-corrosion agents give off substances which are injurious to health.
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Use a wire brush and hot-air gun to remove any paint from the surface. A grinder can remove the galvanized surface and must not be used.
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Important
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A bare galvanized sheet metal surface begins to rust immediately. When grinding galvanized sheet metal to bare metal , it is important to apply primer to the bare surface within max 30 minutes. Use an acid-hardening (etching) primer.
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Galvanized sheet metal should be spot-welded. Weld using slightly higher temperature and pressure than for ordinary cold-rolled sheet metal. Apply a zinc-based primer between the surfaces that are to be welded together.
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Use welding rod suitable for galvanized sheet metal, for example, "Magsi 54" as well as an ordinary controlled atmosphere of mixed gases type for MIG-welding.
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For filling work, use special filler for galvanized sheet metal., for example, Top filler (10) 82 85 488 , with Standox hardener (10) 82 85 496.
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Working with galvanized sheet metal requires a higher standard of protective equipment than ordinary cold-rolled sheet metal.
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All new methods and materials can be used on cold-rolled sheet metal.
