Is the ORFS brazing sleeve for carbon steel tube, type FMB compatible with galvanized tubing and does galvanization affect soldering quality?

Is the ORFS brazing sleeve for carbon steel tube, type FMB compatible with galvanized tubing and does galvanization affect soldering quality? The ORFS brazing sleeve for carbon steel tube, type FMB is available in galvanized carbon steel. Galvanization adds a zinc coating that can interfere with soldering/brazing because zinc melts and vaporizes at temperatures used for brazing, preventing proper wetting and creating porosity or weak joints. Therefore, compatibility depends on process and preparation: - Direct brazing on galvanized tube without removing coating is not recommended. The zinc layer prevents good metallurgical bonding and can cause defects. - Acceptable options: - Remove galvanization at the joint area (mechanical removal, wire brushing, grinding, or chemical stripping) down to bright steel before applying the ORFS brazing sleeve for carbon steel tube, type FMB. Clean thoroughly of residues and flux-activate the base metal. - Use the sleeve and an appropriate flux/filler metal rated for galvanized surfaces and follow manufacturer procedures that address zinc issues (flux that tolerates zinc, controlled heating to limit zinc vapor). Consult sleeve/filler supplier for approved methods. - For continuous galvanization, crimp-on fittings or sleeves designed for galvanized tubing may be preferable when removal isnât feasible. In summary: the ORFS brazing sleeve for carbon steel tube, type FMB can be used with galvanized tubing only if the galvanization is properly removed or if specific approved brazing procedures/materials for galvanized surfaces are used; otherwise galvanization will negatively affect soldering/brazing quality.

Can ORFS brazing sleeve for carbon steel tube, type FMB be used with other tube materials or coatings besides galvanization?

ORFS brazing sleeve for carbon steel tube, type FMB is specified for carbon steel, galvanized. Using it with other tube materials or nonâgalvanized coatings is not recommended unless manufacturer confirms compatibility. Different tube metals (brass, copper, stainless steel, aluminum) and removed or alternative coatings change brazing temperatures, wetting and metallurgical bonding; sleeves designed for carbon steel/gavanized surfaces may not achieve reliable joints or corrosion resistance on other substrates. If you need to use other materials or coatings, consult the sleeve manufacturer for approved substrates, brazing filler metals and process adjustments, or select a sleeve specified for that tube material.

How should the ORFS brazing sleeve for carbon steel tube, type FMB be prepared before soldering to galvanized tubing?

Before soldering an ORFS brazing sleeve for carbon steel tube, type FMB to galvanized tubing, prepare as follows: 1. Clean surfaces: Remove all oil, grease, dirt, paint and loose corrosion from both the sleeve and the galvanized tubing using a suitable solvent (e.g., acetone or isopropyl alcohol). Ensure surfaces are dry and free of residues. 2. Remove zinc coating at joint area: Mechanically abrade or chemically remove the galvanized (zinc) coating from the tubing over the length that will be inside the sleeve and slightly beyond (typically 10â20 mm each side) to expose clean carbon steel. Use emery cloth, wire brush or suitable abrasive until shiny steel is visible. Remove any oxidation created by abrasion. 3. Degrease again: After abrasion, degrease the abraded area to remove particles and oils produced during mechanical cleaning. 4. Flux application: Apply an appropriate brazing/soldering flux compatible with the filler metal and carbon steel to the cleaned surfaces (inside the sleeve and on the exposed tubing). Ensure even coverage to promote wetting and prevent oxidation during heating. 5. Fit and alignment: Slide the ORFS brazing sleeve for carbon steel tube, type FMB over the tubing to the correct position, ensuring proper fit and gap per manufacturer guidance (usually a snug interference or minimal gap). Secure parts to prevent movement during heating. 6. Preheat and solder technique: When heating, apply heat evenly to the sleeve and tubing, not directly to the filler if using preplaced ring or wire. Heat until flux activates and filler flows by capillary action, producing a continuous fillet. Avoid overheating which can damage surrounding zinc plating or change steel properties. 7. Post-solder cleaning: After cooling, remove flux residues with warm water or recommended cleaner to prevent corrosion. Inspect the joint for complete filler flow and proper sealing. Follow any additional manufacturer-specific instructions for the ORFS brazing sleeve for carbon steel tube, type FMB regarding filler alloy, heating method, clearances and ISO/SAE requirements.

ORFS brazing sleeve for carbon steel tube, type FMB

Additional information

Material	CS – steel (cast iron)

ORFS sleeve for soldering to tubing, type FMB. Material: carbon steel, galvanized.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HO-FMB-06	ORFS sleeve for 6 mm tubing, for soldering	6	-	In stock	Enquiry
HO-FMB-08	ORFS sleeve for 8 mm tubing, for soldering	8	-	In stock	Enquiry
HO-FMB-10	ORFS sleeve for 10 mm tubing, for soldering	10	-	In stock	Enquiry
HO-FMB-12	ORFS sleeve for 12 mm tubing, for soldering	12	-	In stock	Enquiry
HO-FMB-16	ORFS sleeve for 16 mm tubing, for soldering	16	-	In stock	Enquiry
HO-FMB-20	ORFS sleeve for 20 mm tube, for soldering	20	-	In stock	Enquiry
HO-FMB-22	ORFS sleeve for 22 mm tubing, for soldering	22	-	In stock	Enquiry
HO-FMB-25	ORFS sleeve for 25 mm tubing, for soldering	25	-	In stock	Enquiry
HO-FMB-28	ORFS sleeve for 28 mm tubing, for soldering	28	-	In stock	Enquiry
HO-FMB-30	ORFS sleeve for 30 mm tubing, for soldering	30	-	In stock	Enquiry