modulo 8

An example of a flux suitable for soldering plain carbon steel is:

• Pure copper

• SiO2 silicon oxide

• Zinc chloride

• Phosphoric acid

An example of a flux suitable for soldering galvanised steel is:

• Pure copper

• SiO2 silicon oxide

• Zinc chloride

• Hydrochloric acid

Non fusion means:

• The solder does not run freely

• The metal to be welded does not form part of the joint

• The metal to be welded forms part of the joint

• No capillary action takes place

The correct method of cleaning a joint in preparation for soldering is:

• First mechanically with a wire brush then apply solder

• First mechanically with a wire brush then apply a flux before using a solvent

• First chemically with a solvent then mechanically with a wire brush before applying a flux

• First mechanically with a wire brush then chemically with a solvent

A suitable material for a soldering iron bit would be?

• Copper

• Brass

• Bronze

• Aluminium

A suitable heat source for sheet metal would be:

• Small pencil grip soldering iron

• Electrical inductance coil

• Large copper soldering iron and furnace

• Solder bath

A suitable heat source for electrical maintenance would be:

• Small pencil grip soldering iron

• Electrical inductance coil

• Large copper soldering iron and furnace

• Solder bath

Care should be taken to hot rinse the joint after using solvents:

• To ensure the solder flows evenly

• Because when heated solvents disappear

• Phosgene gas can be given off

• Unwashed solvents can cause oxidation

Care should be taken when handling fluxes prior to soldering as they can be:

• Passive

• Corrosive

• Toxic

• Radioactive

Where possible flammable cylinders when not in use should be stored:

• Chained, upright in the workshop, away from any heat source

• Chained, upright in an outside compound, away from any heat source

• Laid flat, and chained to a truck, away from any heat source

• Chained with all other cylinders in an outside compound