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 emit substances that are harmful to health.
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Use a wire brush and hot-air gun to remove any paint from the surface. A grinding machine can grind away the galvanized surface and should therefore not be used.
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Important
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Once exposed to the air, galvanized sheet metal immediately starts to rust. When grinding galvanized sheet down to bare metal it is therefore extremely important to apply primer to the exposed surface within 30 minutes at the most. Use an acid-hardening (etching) primer.
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Galvanized sheet metal should be spot welded. Carry out welding at a somewhat higher temperature and pressure than for ordinary cold-rolled sheet. 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, such as "Magsi 54", and an ordinary controlled atmosphere of mixed gas type for MIG welding.
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For filling, special filler for galvanized sheet must be used, such as Top filler (10) 82 85 488, with Standox hardener (10) 82 85 496.
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Working on galvanized sheet metal calls for a higher standard of protective equipment than ordinary cold-rolled sheet.
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All new methods and materials can be used on cold-rolled sheet.
