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Questions and Answers
What are the three methods of bending exhaust pipes?
What are the three methods of bending exhaust pipes?
- Program cards, pattern welding, and custom bending
- Program cards, pattern bending, and custom welding (correct)
- Program welding, pattern cards, and custom bending
- Program bending, pattern welding, and custom cards
What information do program cards provide for pipe bending?
What information do program cards provide for pipe bending?
- Pipe material, thickness, and color
- Pipe length, diameter, and distance between bends (correct)
- Pipe temperature, pressure, and velocity
- Pipe flexibility, elasticity, and durability
When is custom bending necessary for exhaust pipes?
When is custom bending necessary for exhaust pipes?
- When there is no program card or existing pipe (correct)
- When the pipe material is too thick or too thin
- When the pipe is too long or too short
- When the pipe needs to be painted or coated
What is the purpose of end finishing in exhaust systems?
What is the purpose of end finishing in exhaust systems?
What attachments do pipe bending machines have for end finishing?
What attachments do pipe bending machines have for end finishing?
What is MIG welding?
What is MIG welding?
What is oxy-acetylene welding used for?
What is oxy-acetylene welding used for?
What is included in a welding and cutting set?
What is included in a welding and cutting set?
What is the purpose of shielding gas in MIG welding?
What is the purpose of shielding gas in MIG welding?
What are the pressures of compressed gas in cylinders used for welding and cutting?
What are the pressures of compressed gas in cylinders used for welding and cutting?
What is the filler material in acetylene cylinders?
What is the filler material in acetylene cylinders?
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Study Notes
- There are three methods of bending exhaust pipes: program card, pattern bending, and custom bending.
- Program cards provide information on pipe length, diameter, distance between bends, and rotation and depth of bends.
- Pattern bending involves measuring and comparing the old pipe to make a new one.
- Custom bending is necessary when there is no program card or existing pipe.
- End finishing is important for connecting exhaust system components, and pipe bending machines have swaging and expanding attachments for this purpose.
- Metal inert gas (MIG) welding is an arc welding process that uses a continuous solid wire electrode heated and fed into the weld pool from a welding gun.
- Oxy-acetylene welding is used for welding, cutting, and heating to normalize metal, to shrink metal, to forge or shape metal, and to solder.
- The welding and cutting set consists of oxygen and acetylene cylinders, regulators, hoses, welding torch, and friction lighter.
- Shielding gas selection for MIG welding depends on the material being welded and the application.
- The process offers high productivity, as the wire is continuously fed.
- Oxygen and acetylene cylinders are used for welding and cutting metal.
- Cylinders contain compressed gas at pressures up to 2,200 PSI.
- Acetylene cylinders contain a porous filler material wetted with acetone.
- Regulators are used to adjust high oxygen and acetylene pressures to lower working pressures.
- Oxygen and acetylene regulators connect to cylinders differently to avoid mixing them up.
- Double-line rubber hoses are used to connect cylinders, regulators, and torches.
- Check valves and flashback arrestors are used to prevent backflow and flashbacks.
- The torch consists of a handle, oxygen and acetylene gas valves, and a mixing chamber.
- Flashbacks and backfires can occur with improper torch operation.
- Safety precautions must be taken when using oxy-acetylene setups.
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