Can ORFS weldable carbon steel connection, type AS, be welded directly onto a galvanized tube without removing the galvanizing?

ORFS weldable carbon steel connection, type AS Format, made of carbon steel and galvanized, should not be welded directly onto a galvanized tube without removing the galvanizing. Galvanizing (zinc coating) produces toxic fumes (zinc oxide) when heated, can cause porosity, poor fusion, and weak welds due to contamination and boiling of the coating. For safe and sound welding practice: - Remove galvanizing from the weld area by mechanical means (grinding, sanding) or chemical stripping to expose clean base metal. Extend removal sufficiently beyond the planned weld zone to ensure complete fusion. - Clean the exposed area of any residues, oils, or rust before welding. - Use appropriate welding procedures and filler metals for carbon steel. - After welding, recoat the welded area with suitable corrosion protection (zinc-rich paint, hot-dip galvanizing of the joint if feasible, or other corrosion inhibitors) to restore protection. - Ensure proper ventilation or respiratory protection to avoid inhalation of any residual fumes. Following these steps ensures a sound weld and protects personnel and material integrity.

Can ORFS weldable carbon steel connection, type AS, be welded onto a galvanized tube without removing the zinc coating?

Yes. The ORFS weldable carbon steel connection, type AS Format, intended for welding onto a tube, is specified as carbon steel, galvanized. Welding directly onto a galvanized tube is possible but not recommended without precautions: zinc coating near the weld must be removed to prevent weld defects (porosity, contamination) and toxic zinc oxide fumes. Remove galvanization at the weld zone, degrease, and use proper welding procedure, ventilation, and PPE. After welding, restore corrosion protection (e.g., touch-up galvanizing or suitable coating). Failure to remove zinc can compromise weld quality and safety.

Is ORFS weldable carbon steel connection, type AS, suitable for welding onto a galvanized tube with localized heating?

No. An ORFS weldable carbon steel connection, type AS, is not suitable for welding directly onto a galvanized tube with localized heating without prior removal of the zinc coating and appropriate precautions. Galvanized coatings (zinc) vaporize and produce toxic zinc oxide fumes when heated, can cause porosity and weak welds, and interfere with proper fusion. For safe, sound welds you must: - Remove the galvanizing locally in the weld area (mechanical grinding, chemical stripping) to expose bare carbon steel. - Clean to bright metal and degrease; extend removal beyond the joint area as recommended by welding standards. - Use proper ventilation and respiratory protection during welding to avoid zinc fume exposure. - Select welding process and filler compatible with carbon steel; preheat and interpass temperatures per material thickness and specification. - After welding, inspect for defects and restore corrosion protection (hot-dip galvanizing is impractical locally; consider zinc-rich paint or spray, or re-galvanize the whole tube if required). If removal of galvanizing or post-weld protection is impractical, consider using an ungalvanized tube, a mechanical fitting rated for galvanized tubing, or a non-welded connection designed for ORFS fittings.

ORFS weldable carbon steel connection, type AS

Additional information

Material	CS – steel (cast iron)

ORFS fitting for welding onto a tube, type AS. Material: carbon steel, galvanized.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HO-AS-11-14	ORFS GZ 11/16"-16 AS fitting for 14 mm pipe	-	420	In stock	Enquiry
HO-AS-13-16	ORFS GZ 13/16"-16 AS fitting for 16 mm pipe	-	420	In stock	Enquiry
HO-AS-16-16	ORFS GZ 1"-14 AS fitting for 16 mm pipe	-	420	In stock	Enquiry
HO-AS-19-22	ORFS GZ 1.3/16"-12 AS fitting for 22 mm pipe	-	420	In stock	Enquiry
HO-AS-23-25	ORFS GZ 1.7/16"-12 AS fitting for 25 mm pipe	-	420	In stock	Enquiry