Question

1. in of welding the ____ metal is melted and a __ metal may be added to ____ the weld.
2. in tb, the metal is ____ to a sufficient __ but below its __ point, so that a __ alloy can be melted and __ to the hot ____ metal.
3. what type of metal do you use for of and tb?
4. oxyfuel gas cutting uses the ____ flame to heat the surface of a __ of __ to a __ where a __ stream of __ flowing out a __ hole in the tip causes the hot ____ to burn away.
5. what type of metal can you cut with oxyfuel gas?
6. what does pac stand for?
7. plasma arc cutting uses a stiff, highly ____, extremely hot __ of gas to almost instantly __ the ____ being cut.
8. draw figure 1.10 and label the parts.

Explanation:

Question 22: What does PAC stand for?

In the context of metalworking and cutting processes, "PAC" is a common abbreviation. In the field of welding and cutting, "PAC" stands for Plasma Arc Cutting. This is a process that uses a plasma torch to cut through electrically conductive materials.

Oxyfuel gas cutting is suitable for metals that are reactive with oxygen and can be oxidized at the cutting temperature. Typically, metals that are ferrous (containing iron) are cut with oxyfuel gas. The most common example is carbon steel. Oxyfuel gas cutting works by heating the metal to its ignition temperature and then using a stream of oxygen to burn (oxidize) the metal, which is then blown away, creating the cut. Non - ferrous metals like aluminum or copper are generally not cut with oxyfuel gas as they form a protective oxide layer that prevents further oxidation and cutting.

Answer:

PAC stands for Plasma Arc Cutting.

Question 21: What type of metal can you cut with oxyfuel gas?