Yes, a galvanized pipe can be welded, but there are some important considerations to keep in mind when welding galvanized steel.

1. Ventilation: Welding galvanized steel produces zinc fumes that can be harmful if inhaled. Ensure proper ventilation in the welding area to disperse these fumes.

2. Removal of Zinc Coating: The zinc coating on the galvanized pipe must be removed from the area to be welded. This is typically done by grinding or wire brushing to expose the bare steel underneath.

3. Preheating: Preheating the steel to be welded can help to reduce the risk of cracking in the weld and improve the weld quality.

4. Welding Technique: Use the appropriate welding technique and settings for galvanized steel. It's often recommended to use lower welding currents and travel speeds to minimize the zinc evaporation and reduce the chance of weld defects.

5. Personal Protective Equipment: Welders should wear appropriate protective equipment, including a respirator or mask suitable for filtering out zinc fumes.

6. Post-Weld Treatment: After welding, the area should be cleaned and inspected for any imperfections. Some post-weld treatments, such as galvanized coatings or painting, may be required to protect the welded area from corrosion.

Two problems. First, the gaseous vapor of heated galvanizing is a health hazard and can only be done in very good ventilation. Second, the galvanizing is burned off during welding, leaving the welded joint susceptible to corrosion.

Yes but first strip the galvanizing watching the expected weld bead area so there is good electrical contact with the weld electrode. Also clean an area where the earth clamp will be fitted.

Some electric welders have sufficient power to burn off the galvanizing around the weld area and it just needs a scratch near the striking area. I have seen welders who are experienced do this in the open air. I would not contemplate this myself being afraid of unhealthy fumes and bird shit weld appearance.

After completion of the weld, descaling etc apply some gal paint to the weld.

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