When welding galvanized sheet metal, you need to pay attention to:
1. Before welding, the zinc layer must be cleaned thoroughly to avoid the generation of toxic gases during welding. Solvents or other cleaning agents can be used for cleaning.
2. Select the correct welding current and voltage to ensure weld quality and stability.
3. Reduce welding time as much as possible and avoid overheating the zinc layer to avoid damage and oxidation of the zinc layer.
4. During welding, avoid concentrating excessive heat in one location to avoid damage to the zinc layer and corrosion.
5. When performing gas welding or arc welding, use low-temperature welding rods and avoid aiming the flame or arc directly at the zinc layer.
6. After welding, the welded area should be derusted and treated with an anti-corrosion agent to ensure weld quality and corrosion protection.
7. Before welding, inspect the surface of the galvanized sheet for cracks, bubbles, or other defects to avoid quality issues during welding.
8. When performing MIG or TIG welding, select an appropriate gas, such as argon or carbon dioxide, to ensure welding stability and quality. 

9. Galvanized sheet metal is relatively thin, so the welding current and voltage must be carefully controlled to avoid over-welding.
10. When performing gas welding or arc welding, you need to pay attention to the direction of the sparks and flames, and avoid pointing them directly at the zinc layer to avoid damaging the zinc layer and causing corrosion.

Galvanized steel is a corrosion-resistant steel sheet coated with a layer of zinc.
When welding galvanized sheet, it's best to use MIG (metal inert gas) or TIG (tungsten arc welding).
Both methods melt and join metal materials at high temperatures, and they avoid the evaporation of zinc oxide during welding and the resulting release of toxic gases.
Alternatively, galvanized sheets can be welded using arc or gas welding methods, but extreme care must be taken to avoid heat damage to the zinc layer.

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