A professional who mixes soldering flux, and supplies soldering or welding machines with flux and solder. Respnsibilities include:

• Mixes flux in crock or vat according to formula, using paddle.
• Tests consistency of flux with hydrometer.
• Carries or trucks flux or solder to machines.
• Cleans reservoirs of spent or stale flux, using solvent.
• Keeps records of solder and flux consumed and salvaged.