Worksheetsmodulo 8
Total questions: 20
Worksheet time: 10mins
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
The main hazards associated with electrical soldering irons are:
Tripping over leads, fires, electric shock
Burns from the soldering iron, and electrical shock
Flammable cylinders, fires, electric shock
Burns from the soldering iron, and tripping over leads
The flux tallow:
Is a corrosive flux and is used on sheet metal items
Is a passive flux and is used when joining electrical connections
Is a corrosive flux and is used when joining electrical connections
Is a passive flux and is used on sheet metal items
The process known as tinning involves:
Capillary action
Applying a thin layer of solder over the joint
Applying a thin layer of solder over the soldering iron
Using a solder with high tin content
The main difference between soldering and brazing is:
Soldering is performed at lower temperatures
Soldering uses a capillary action to form the joint
Brazing uses a capillary action to form the joint
They are the same process
The most appropriate heat source for small mass produced items would be:
Oxy-acetylene torch
Oxy-propane torch
Large furnace oven
HF induction heating
The term 'wetting' means:
Placing the joint in an acid bath to clean
The ability of the adhesive to cover and adhere to the surfaces to be joined
Hot rinsing pickling acid, to prevent toxic fumes forming with the application of heat
Hot rinsing residual corrosive flux
Shear strength is the ability of a material to withstand:
Offset load
A force perpendicular to the joint
Impact from a hammer
Being pulled apart at a corner or edge
Peel strength is the ability of a material to withstand:
Offset load
A force perpendicular to the joint
Impact from a hammer
Being pulled apart at a corner or edge
Cleavage strength is the ability of a material to withstand:
Offset load
A force perpendicular to the joint
Impact from a hammer
Being pulled apart at a corner or edge
The preferred adhesive to bond metal would be:
Thermoplastic adhesive
Thermosetting adhesive
Natural adhesives
Elastomer adhesives
