OCA WCS05 Module 3&4

While performing an oxyacetylene weld using a filler rod, too much heat was applied and the weld appears close to burning through.

Technician A says that dipping the filler rod repeatedly into the puddle will help cool the puddle.

Technician B says that lifting the torch will help cool the puddle.

Who is right?

• Technician A

• Technician B

• Both A and B

• Neither A nor B

The proper classification of filler rod when oxyacetylene welding steel is:

• OWCuZn.

• ER70S-6.

• RBCuZn.

• ER70S-1.

The root of a fillet weld joint is the:

• edge of the top overlapped piece.

• face of the bottom piece.

• intersection of the two overlapped pieces.

• underside of the joint.

The distance the torch tip should be from the base metal during most of the joint when oxyacetylene welding is about:

• 1.6 mm (1⁄16").

• 25 mm (1").

• 76 mm (3").

• 127 mm (5").

Oxyacetylene welding steel is a fusion process because:

• the steel reaches its melting point.

• the steel bonds together, like an adhesive bond.

• a filler rod can be used.

• a direct flame generates the welding heat.

Technician A says that a concern when oxyacetylene cutting on vehicles is not being able to cut through some thicknesses of metal.

Technician B says that a concern when oxyacetylene cutting on vehicles is the wide heat-effect zone that the process creates.

Who is right?

• Technician A

• Technician B

• Neither A nor B

• Both A and B

The preheat flame in the oxyacetylene cutting process is:

• pure oxygen.

• pure acetylene.

• a mixture of oxygen and acetylene.

• ionized compressed air.

The major factor for the maximum thickness that a plasma arc cutting system can cut is the:

• force of the ionized air produced.

• amperage produced.

• size of the cutting torch.

• quality of the compressed air.

To prevent a “pop” when shutting off an oxyacetylene cutting head, close the:

• preheat oxygen control valve before the acetylene torch handle valve.

• acetylene torch handle valve before the preheat oxygen control valve.

• oxygen torch handle valve before the preheat oxygen control valve.

• acetylene torch handle valve before the oxygen torch handle valve.

Technician A says that temperature indicators are required when heating sheet metal for straightening.

Technician B says that temperature indicators are required when heating a corroded bolt.

Who is right?

• Technician A

• Technician B

• Both A and B

• Neither A nor B