How to clean a clogged torch nozzle

Read the flame before you touch the nozzle. A clean cone means the nozzle is fine. A ragged or yellow flame with an uneven cone usually means dirt. A split flame, or no improvement after cleaning, means damage. Dirty = uneven but round orifice; damaged = oval orifice, distortion, or no improvement after cleaning. Only the first one is a cleaning job.

Carbon from incomplete combustion, flux residue after soldering, dust, and butane impurities all build up in a small orifice. Clogs are normal on cartridge nozzles and cheap to fix — which is why a cleaner set belongs in every kit.

Use the smallest wire that slides into the orifice without force. Never ream, never twist hard, and never reach for a drill bit — an oversized wire is how a £2 cleaning job becomes a £15 nozzle replacement. The 12-size set covers every orifice you will meet: choose the matched wire, not the biggest one that fits.

Cool the torch. Remove the nozzle. Select the wire. Draw it through once or twice. Clear the seat. Blow through. Reassemble and test for a clean blue cone. On blowtorches, also clean the burner seat — a carboned Superfire 2 head is the usual suspect behind a “lazy” flame.

If the orifice is oval, or the flame stays ragged after a proper clean, the nozzle is worn — only replacement restores the flame. That goes for EN417 cartridge nozzles, brazing nozzles and oxy-acetylene welding nozzles alike: cleaning fixes dirt, not wear.

Store torches with nozzle caps on, purge the line after use on oxy rigs, buy clean butane, and clean little and often instead of rescuing a badly carboned nozzle at the start of every job.