Ag Mech 2 - 4.03 (Part 1)

If a welder is using an oxyacetylene torch and must start a cut in the center of a thick piece of metal, that person should:

• drill a 1/4-inch hole in the metal beforehand.

• cut a bevel in the base metal to help penetration.

• hold the blowpipe on the metal for better penetration.

• hold the blowpipe 1 inch above the metal to avoid slag.

While one is cutting, the proper distance from the metal to hold the inner core of a cutting torch is:

• 1/8"

• 1/2"

• 5/8"

• 3/4"

To avoid injury from hot molten metal produced when cutting with the oxyacetylene torch, Melinda should:

• spread wet paper towels on the floor prior to cutting.

• point the torch away from the metal being cut.

• use a metal container to catch the metal.

• stand with her feet shoulder-width apart.

José uses extra care when using an oxyacetylene torch to cut metal that is lying on a concrete floor, because:

• chemicals may be released from concrete.

• concrete causes the torch to burn cooler.

• concrete may be damaged by the heat.

• the risk of a fire hazard is increased.

When one welds with an oxyacetylene unit, high-carbon steel should be preheated until it is:

• blue.

• blue-gray.

• red.

• white.

When adjusting the pressure in acetylene lines, avoid exceeding the maximum amount of:

• 1 pound per square inch.

• 2 pounds per square inch.

• 10 pounds per square inch.

• 15 pounds per square inch.

Jamal uses flux on metal before he solders it to:

• aid in the flow of heat.

• cool the metal uniformly.

• heat the metal uniformly.

• remove oxides, sulfides, and nitrates

When one welds with an oxyacetylene unit, the flame should usually be adjusted to:

• carbonizing.

• neutral.

• oxidizing.

• pressuring.

Janna is brazing two pieces of sheet metal together because:

• a repair that has been made by brazing will withstand high temperatures.

• there is less chance of changing the base-metal characteristics.

• brazing makes the joint stronger than other types of welding.

• the bronze filler metal is melted into the base metal.

To anneal metal, heat it to the proper temperature and then:

• let it sit at room temperature.

• cool it very slowly in sand.

• cool it with warm water.

• quench it in water.